American Cancer Society Guidelines for the Early Detection of Cancer, 2005

Exploring the role of natural bioactive molecules in genitourinary cancers: how far has research progressed?

The primary approaches to treat cancerous diseases include drug treatment, surgical procedures, biotherapy, and radiation therapy. Chemotherapy has been the primary treatment for cancer for a long time, but its main drawback is that it kills cancerous cells along with healthy ones, leading to deadly adverse health effects. However, genitourinary cancer has become a concern in recent years as it is more common in middle-aged people. So, researchers are trying to find possible therapeutic options from natural small molecules due to the many drawbacks associated with chemotherapy and other radiation-based therapies. Plenty of research was conducted regarding genitourinary cancer to determine the promising role of natural small molecules. So, this review focused on natural small molecules along with their potential therapeutic targets in the case of genitourinary cancers such as prostate cancer, renal cancer, bladder cancer, testicular cancer, and so on. Also, this review states some ongoing or completed clinical evidence in this regard.

DNA Based and Stimuli-Responsive Smart Nanocarrier for Diagnosis and Treatment of Cancer: Applications and Challenges

The rapid development of multidrug co-delivery and nano-medicines has made spontaneous progress in tumor treatment and diagnosis. DNA is a unique biological molecule that can be tailored and molded into various nanostructures. The addition of ligands or stimuli-responsive elements enables DNA nanostructures to mediate highly targeted drug delivery to the cancer cells. Smart DNA nanostructures, owing to their various shapes, sizes, geometry, sequences, and characteristics, have various modes of cellular internalization and final disposition. On the other hand, functionalized DNA nanocarriers have specific receptor-mediated uptake, and most of these ligand anchored nanostructures able to escape lysosomal degradation. DNA-based and stimuli responsive nano-carrier systems are the latest advancement in cancer targeting. The data exploration from various studies demonstrated that the DNA nanostructure and stimuli responsive drug delivery systems are perfect tools to overcome the problems existing in the cancer treatment including toxicity and compromised drug efficacy. In this light, the review summarized the insights about various types of DNA nanostructures and stimuli responsive nanocarrier systems applications for diagnosis and treatment of cancer.

Localization of Nuclei in Breast Cancer Using Whole Slide Imaging System Supported by Morphological Features and Shape Formulas

PURPOSE

Cancer rates are exponentially increasing worldwide and over 15 million new cases are expected in the year 2020 according to the World Cancer Report. To support the clinical diagnosis of the disease, recent technical advancements in digital microscopy have been achieved to reduce the cost and increase the efficiency of the process. Food and Drug Administration (FDA or Agency) has issued the guidelines, in particular, the development of digital whole slide image scanning system. It is very helpful to the computer-aided diagnosis of breast cancer.

METHODS

Whole slide imaging supported by fluorescence, immunohistochemistry, and multispectral imaging concepts. Due to the high dimension of WSI images and computation, it is a challenging task to find the region of interest (ROI) on a malignant sample image. The unsupervised machine learning and quantitative analysis of malignant sample images are supported by morphological features and shape formulas to find the correct region of interest. Due to computational limitations, it starts to work on small patches, integrate the results, and automated localize or detect the ROI. It is also compared to the handcrafted and automated region of interest provided in the ICIAR2018 dataset.

RESULTS

A total of 10 hematoxylins and eosin (H&E) stained malignant breast histology microscopy whole slide image samples are labeled and annotated by two medical experts who are team members of the ICIAR 2018 challenge. After applying the proposed methodology, it is successfully able to localize the malignant patches of WSI sample images and getting the ROI with an average accuracy of 85.5%.

CONCLUSION

With the help of the k-means clustering algorithm, morphological features, and shape formula, it is possible to recognize the region of interest using the whole slide imaging concept.

Adherence to the Mediterranean dietary pattern in relation to glioma: A case-control study

BACKGROUND

Although Mediterranean diet (MD) was associated with a lower risk of mortality and cancer, no data are available investigating the association between adherence to the MD and risk of glioma.

METHODS

In this case-control study, we enrolled a total of 128 newly diagnosed patients with glioma, confirmed by pathological assessment, and 256 hospital-based controls from 2009 to 2011 in Tehran, Iran. A valid and reliable Block-format food frequency questionnaire (FFQ) was used to assess dietary intakes. Adherence to the MD was examined using the scoring method suggested by Trichopoulou et al. Logistic regression was used to examine the associations of interest.

RESULTS

After controlling for age, sex, and energy intake, participants in the highest tertile of MD score had not significantly lower odds of glioma than those in the lowest tertile (OR: 0.58, 95% CI: 0.32-1.03, P_trend = 0.06). However, after taking other potential confounders into account, individuals with the greatest adherence to the MD score were 74% less likely to have glioma than those with the lowest adherence (OR: 0.26, 95% CI: 0.12-0.55, P_trend < 0.001). Additional adjustments for dietary intakes and BMI did not significantly alter this association (OR: 0.36, 95% CI: 0.16-0.78, P_trend = 0.009; OR: 0.36, 95% CI: 0.16-0.78, P_trend = 0.01, respectively).

CONCLUSION

We found that adherence to the MD was associated with a lower likelihood of having glioma. Prospective cohort studies are needed to further examine these findings.

Awareness and Practice of Breast Self Examination among Women in Different African Countries: A 10-Year Review of Literature

Breast self examination (BSE) is an important screening technique in detecting breast abnormalities. This procedure enables women become familiar with their breasts, thus making it easier for them to detect any changes that may occur. Routine performance of BSE is recommended for females above 20 years. This review of literature was conducted to assess the awareness and practice of BSE among women in different countries in Africa. A total of 28 out of 80 articles were reviewed from 15 African countries based on relevance. Review identification was performed through the search of Google Scholar and PubMed/MEDLINE/PubMed Central databases. Search terms used were “BSE,” “awareness,” “practice,” and “Africa.” Reference lists of identified studies were also used to find more studies. Majority of the reviewed studies showed adequate awareness, mainly from the media, but poor practice of BSE among women in various countries in Africa. A major barrier identified was inadequate knowledge of BSE technique. Although awareness of BSE was relatively high in many of the reviewed studies, the practice was low. Educational intervention program should be carried out among women in various African countries, not only to raise awareness but also to educate on the skills required to carry out BSE effectively.

Factors associated with routine screening for the early detection of breast cancer in cultural-ethnic and faith-based communities

OBJECTIVES

Studies have shown a lower adherence to health behaviors among women in cultural-ethnic minorities and faith-based communities, especially lower screening attendance for the early detection of breast cancer. This study compares factors related to cancer screening adherence in two distinct cultural-ethnic minorities in Israel: Arab women as a cultural-ethnic minority and Jewish ultra-Orthodox women as a cultural-ethnic faith-based minority.

DESIGN

During the year 2014, a total of 398 Jewish ultra-Orthodox women and 401 Arab women between the ages of 40-60, were randomly selected using population-based registries. These women answered questionnaires regarding adherence to mammography and clinical breast examination (CBE), health beliefs and cultural barriers.

RESULTS

Arab women adhered more than ultra-Orthodox women to mammography (p < .001) and CBE exams (p < .01). Religious beliefs, exposure barriers and perceived risk were higher among the ultra-Orthodox women, while social barriers, accessibility barriers and perceived severity were higher among the Arab women (p < .01). Adjusting for background factors, higher adherence to CBE and mammography were associated with lower levels of religious beliefs (AOR = 0.90, 95% CI = 0.69-1.17 AOR = 0.62, 95% CI = 0.39-0.82, respectively), perceiving a higher risk of cancer (AOR = 1.93, 95% CI = 1.23-3.04 and AOR = 3.22, 95% CI = 1.53-6.61), and having more fears related to cancer-related losses (AOR = 1.51, 95% CI = 1.19-3.00 and AOR = 1.24, 95% CI = 0.63-1.22). In addition, perceiving greater advantages of CBE was associated with higher adherence to CBE (AOR = 1.82, 95% CI = 1.45-2.29), while not receiving a physician's recommendation was associated with lower adherence to mammography (AOR = 1.82, 95% CI = 1.45-2.29).

CONCLUSION

This study addressed a lacuna in screening behaviors of women from cultural-ethnic and faith-based communities. In order to increase adherence, health care professionals and policymakers should direct their attention to the specific nature of each community.

Endometrial Cancer: An Overview of Pathophysiology, Management, and Care

OBJECTIVE

To provide an overview of the etiology, diagnosis, treatment, and survivorship concerns surrounding endometrial cancer.

DATA SOURCES

A review of articles dated 2006-2018 from PubMed and NCCN guidelines.

CONCLUSION

Endometrial cancer is the most common gynecologic malignancy. Staging and treatment are primarily surgical, with adjuvant radiation and chemotherapy administered as indicated by grade and stage.

IMPLICATIONS FOR NURSING PRACTICE

Cancer prevention, response to treatment, and quality of life can be affected by lifestyle factors, including nutrition, exercise, and tobacco use. Nurses in diverse roles and practice settings can educate patients about lifestyle choices that can affect individuals across the cancer trajectory.

Influences on anticipated time to ovarian cancer symptom presentation in women at increased risk compared to population risk of ovarian cancer

Background

In the absence of routine ovarian cancer screening, promoting help-seeking in response to ovarian symptoms is a potential route to early diagnosis. The factors influencing women’s anticipated time to presentation with potential ovarian cancer symptoms were examined.

Methods

Cross-sectional questionnaires were completed by a sample of women at increased familial risk (n = 283) and population risk (n = 1043) for ovarian cancer. Measures included demographic characteristics, symptom knowledge, anticipated time to symptom presentation, and health beliefs (perceived susceptibility, worry, perceived threat, confidence in symptom detection, benefits and barriers to presentation). Structural equation modelling was used to identify determinants of anticipated time to symptomatic presentation in both groups.

Results

Associations between health beliefs and anticipated symptom presentation differed according to risk group. In increased risk women, high perceived susceptibility (r = .35***), ovarian cancer worry (r = .98**), perceived threat (r = −.18**), confidence (r = .16**) and perceiving more benefits than barriers to presentation (r = −.34**), were statistically significant in determining earlier anticipated presentation. The pattern was the same for population risk women, except ovarian cancer worry (r = .36) and perceived threat (r = −.03) were not statistically significant determinants.

Conclusions

Associations between underlying health beliefs and anticipated presentation differed according to risk group. Women at population risk had higher symptom knowledge and anticipated presenting in shorter time frames than the increased risk sample. The cancer worry component of perceived threat was a unique predictor in the increased risk group. In increased risk women, the worry component of perceived threat may be more influential than susceptibility aspects in influencing early presentation behaviour, highlighting the need for ovarian symptom awareness interventions with tailored content to minimise cancer-related worry in this population.

Electronic supplementary material

The online version of this article (10.1186/s12885-017-3835-y) contains supplementary material, which is available to authorized users.

Fe3O4 nanoparticles on graphene oxide sheets for isolation and ultrasensitive amperometric detection of cancer biomarker proteins

Ultrasensitive mediator-free electrochemical detection for biomarker proteins was achieved at low cost using a novel composite of Fe3O4 nanoparticles loaded onto graphene oxide (GO) nano-sheets (Fe3O4@GO). This paramagnetic Fe3O4@GO composite (1µm size range) was decorated with antibodies against prostate specific antigen (PSA) and prostate specific membrane antigen (PSMA), and then used to first capture these biomarkers and then deliver them to an 8-sensor detection chamber of a microfluidic immunoarray. Screen-printed carbon sensors coated with electrochemically reduced graphene oxide (ERGO) and a second set of antibodies selectively capture the biomarker-laden Fe3O4@GO particles, which subsequently catalyze hydrogen peroxide reduction to detect PSA and PSMA. Accuracy was confirmed by good correlation between patient serum assays and enzyme-linked immuno-sorbent assays (ELISA). Excellent detection limits (LOD) of 15 fg/mL for PSA and 4.8 fg/mL for PSMA were achieved in serum. The LOD for PSA was 1000-fold better than the only previous report of PSA detection using Fe3O4. Dynamic ranges were easily tunable for concentration ranges encountered in serum samples by adjusting the Fe3O4@GO Concentration. Reagent cost was only $0.85 for a single 2-protein assay.

Current strategies in the diagnosis of endometrial cancer

PURPOSE

Endometrial cancer is the most common gynecological malignancy in developed countries. There are no uniform recommendations for endometrial cancer screening in the general population. Therefore, it is of paramount importance that the primary physician profoundly understands, and is familiar with the methods for prevention and early detection of endometrial cancer. The aim of this review is to provide the primary physician with a toolbox to reach these goals.

METHODS

We performed a systemic review to summarize the current strategies to diagnose and prevent endometrial cancer. Many published articles from the last years were identified and included.

RESULTS

A systematic review that summarizes the important subjects in the diagnosis and prevention of endometrial cancer.

CONCLUSION

Maintaining a high index of suspicion and obtaining endometrial biopsies from all suspected patients is the key for achieving a timely diagnosis.

Managing the Kidney Waiting List

Candidates on the kidney transplant list wait for longer periods and have increasing numbers of comorbid conditions. To ensure that these candidates are acceptable for transplantation when an organ becomes available, physical, psychosocial, and financial strategies are essential. The authors surveyed 68 transplant centers to determine current practices. Eighteen percent of centers did not reevaluate candidates. Other programs used time on the list, disease, age, or a combination of these factors as evaluation criteria. Initial cardiac evaluation was relied upon by 51.4% of centers, with varying criteria used to determine status. Social work evaluation was done by 42.6% of centers, usually annually. Annual financial reevaluation was performed in 57.4%. Data support reviewing candidates, especially those with diabetes, those who have been receiving dialysis for a long time, and those older than 60 years. The dedication of one coordinator to manage waitlisted candidates using age, diagnosis, and time receiving dialysis was effective in this study.

Nonmedical information seeking amid conflicting health information: negative and positive effects on prostate cancer screening

This study investigates the impact of seeking information about the prostate-specific antigen (PSA) test on men's PSA test use during a period of conflicting recommendations. Analyses used longitudinal survey data collected in 2005 and 2006 from a nationally representative sample of U.S. males aged 40-70 years (n = 777). Cross-sectionally, nonmedical information seeking was significantly associated with increased odds of having a PSA test in the past year (Time 1 odds ratio [OR] = 9.74, p < .01, 95% confidence interval [CI] = 4.37, 21.70; Time 2 OR = 5.78, p < .01, 95% CI = 3.17, 10.55). However, lagged analyses showed that among men who had a PSA at Time 1, active seeking is associated with reduced odds of later having a PSA test (OR = 0.33, p < .05, 95% CI = 0.13, 0.85). Participants who had not had a PSA test in the past year very rarely sought information about PSA tests. Information acquisition in an environment of conflicting recommendations may influence adoption of cancer screening behaviors.

A review of the evidence of harm from self-tests

Although HIV self-testing may overcome some barriers to HIV testing, various stakeholders have expressed concerns that HIV self-testing may lead to unintended harm, including psychological, social and medical harm. Recognizing that similar concerns were raised in the past for some other self-tests, we conduct a review of the literature on a set of self-tests that share some characteristics with HIV self-tests to determine whether there is any evidence of harm. We find that although the potential for harm is discussed in the literature on self-tests, there is very little evidence that such harm occurs.

Effect of screening sigmoidoscopy and screening colonoscopy on colorectal cancer incidence and mortality: systematic review and meta-analysis of randomised controlled trials and observational studies

OBJECTIVES

To review, summarise, and compare the evidence for effectiveness of screening sigmoidoscopy and screening colonoscopy in the prevention of colorectal cancer occurrence and deaths.

DESIGN

Systematic review and meta-analysis of randomised controlled trials and observational studies.

DATA SOURCES

PubMed, Embase, and Web of Science. Two investigators independently extracted characteristics and results of identified studies and performed standardised quality ratings.

ELIGIBILITY CRITERIA

Randomised controlled trials and observational studies in English on the impact of screening sigmoidoscopy and screening colonoscopy on colorectal cancer incidence and mortality in the general population at average risk.

RESULTS

For screening sigmoidoscopy, four randomised controlled trials and 10 observational studies were identified that consistently found a major reduction in distal but not proximal colorectal cancer incidence and mortality. Summary estimates of reduction in distal colorectal cancer incidence and mortality were 31% (95% confidence intervals 26% to 37%) and 46% (33% to 57%) in intention to screen analysis, 42% (29% to 53%) and 61% (27% to 79%) in per protocol analysis of randomised controlled trials, and 64% (50% to 74%) and 66% (38% to 81%) in observational studies. For screening colonoscopy, evidence was restricted to six observational studies, the results of which suggest tentatively an even stronger reduction in distal colorectal cancer incidence and mortality, along with a significant reduction in mortality from cancer of the proximal colon. Indirect comparisons of results of observational studies on screening sigmoidoscopy and colonoscopy suggest a 40% to 60% lower risk of incident colorectal cancer and death from colorectal cancer after screening colonoscopy even though this incremental risk reduction was statistically significant for deaths from cancer of the proximal colon only.

CONCLUSIONS

Compelling and consistent evidence from randomised controlled trials and observational studies suggests that screening sigmoidoscopy and screening colonoscopy prevent most deaths from distal colorectal cancer. Observational studies suggest that colonoscopy compared with flexible sigmoidoscopy decreases mortality from cancer of the proximal colon. This added value should be examined in further research and weighed against the higher costs, discomfort, complication rates, capacities needed, and possible differences in compliance.

Effect of NeuroD gene silencing on the migration and invasion of human pancreatic cancer cells PANC-1

The aim of this study is to investigate the influence of Lenti-EGFP-NeuroD-miR, RNAi lentiviral expression vector, on the expression level of NeuroD and migration, and invasion of PANC-1 cell line. PANC-1 cells were cultured and cotransfected with Lenti-EGFP-NeuroD-miR and Lenti-GFP. The infection rate of lentivirus was determined by fluorescence. The interfering effection by the expression of NeuroD mRNA in PANC-1 cells was analyzed by real-time PCR after transfected. Biological behavior of PANC-1 cells transinfected was observed, and the migration and invasion were studied by transwell assay. Intrapancreatic allografts model in nude mice was established to observe the effects of NeuroD on tumorigenesis, tumor growth, and invasion in vivo. The expression of NeuroD mRNA decreased significantly after RNAi lentivirus transinfecting PANC-1 cell. The cell's migration and invasion ability decreased obviously as soon as down regulate of NeuroD in PANC-1 cells. Comparing with control group, the tumors were smaller in size and the invasiveness was inhibited after 8 weeks intrapancreatic allografts in nude mice. Lenti-EGFP-NeuroD-miR transfected into PANC-1 cells shows a stable, effective, and especial blocking expression of NeuroD in mRNA level. The RNAi of lentiviral vector target NeuroD can reduce the migration and invasion abilities of PANC-1 cells.

Determinants of receipt of recommended preventive services: implications for the Affordable Care Act

OBJECTIVES

We examined preventive care use by nonelderly adults (aged 18-64 years) before the Affordable Care Act (ACA) and considered the contributions of insurance coverage and other factors to service use patterns.

METHODS

We used data from the 2005-2010 Medical Expenditure Panel Survey to measure the receipt of 8 recommended preventive services. We examined gaps in receipt of services for adults with incomes below 400% of the federal poverty level compared with higher incomes. We then used a regression-based decomposition analysis to consider factors that explain the gaps in service use by income.

RESULTS

There were large income-related disparities in preventive care receipt for nonelderly adults. Differences in insurance coverage explain 25% to 40% of the disparities in preventive service use by income, but education, age, and health status are also important drivers.

CONCLUSIONS

Expanding coverage to lower-income adults through the ACA is expected to increase their preventive care use. However, the importance of education, age, and health status in explaining income-related gaps in service use indicates that the ACA cannot address all barriers to preventive care and additional interventions may be necessary.

Awareness and Practice of Breast Self-Examination among Market Women in Abakaliki, South East Nigeria

BACKGROUND

Breast cancer is the most common female malignancy and commonly associated with high levels of morbidity and mortality in developing countries due to late presentation. Breast self-examination (BSE) can help in early detection of the disease.

AIMS

This study aims to determine the awareness and practice of BSE among market women in Abakailiki, Southeast Nigeria.

SUBJECTS AND METHODS

This cross-sectional descriptive study involved the use of questionnaire among market women in Abakaliki. Inclusion criteria were women from the age of 18 years and above who own or sell in a shop, while females less than 18 years of age and women who came to the market to buy products were excluded. Questionnaires were distributed randomly among women who met the criteria in every shop visited based on willingness to participate. Analysis was done using Epi info version 3:5:3 (Atlanta Geogia USA.2008). The association between variables was tested using Chi square for trend statistics. Significance was set at P < 0.05. Binomial logistic regression analysis was used to test for relationship between the age group categories against ever heard of BSE.

RESULTS

The age range of participants was between 20 and 65 years, with a mean age of 34.3 (10.8) years. The age range between 20 and 29 years constituted the highest age group 35.3% (84/238). Majority 54.2% (129/238) had a maximum of secondary education. Of the 238 participants, 77.7% have heard of breast cancer, of which 73.9% thought that early detection would aid treatment. Only 38.9% (6/195), 13% and 13.4% have heard of BSE, clinical breast examination and mammography, respectively. Just 23.9% have been taught how to perform BSE, while 21.8% had done it in the past. One person 0.4% knew the correct frequency of BSE, and also did it regularly. There was a statistically significant difference between the level of education and awareness of BSE. However, there was no statistical significant difference between participants age and awareness of BSE.

CONCLUSION

There was a low level of awareness of BSE among market women in Abakiliki, and there is a need to increase the level of awareness through campaigns.

Interplay between SOX9, β-catenin and PPARγ activation in colorectal cancer

Colorectal carcinogenesis relies on loss of homeostasic mechanisms regulating cell proliferation, differentiation and survival. These cell processes have been reported to be influenced independently by transcription factors activated downstream of the Wnt pathway, such as SOX9 and β-catenin, and by the nuclear receptor PPARγ. The purpose of this study was to explore the expression levels and functional link between SOX9, β-catenin and PPARγ in the pathogenesis of colorectal cancer (CRC). We evaluated SOX9, β-catenin and PPARγ expression levels on human CRC specimens by qPCR and immunoblot detection. We tested the hypothesis that PPARγ activation might affect SOX9 and β-catenin expression using four colon cancer cell lines (CaCo2, SW480, HCT116, and HT29 cells). In CRC tissues SOX9 resulted up-regulated at both mRNA and protein levels when compared to matched normal mucosa, β-catenin resulted up-regulated at protein levels, while PPARG mRNA and PPARγ protein levels were down-regulated. A significant relationship was observed between high PPARG and SOX9 expression levels in the tumor tissue and female gender (p=0.005 and p=0.04, respectively), and between high SOX9 expression in the tumor tissue and age (p=0.04) and microsatellite instability (MSI), in particular with MSI-H (p=0.0002). Moreover, treatment with the synthetic PPARγ ligand rosiglitazone induced different changes of SOX9 and β-catenin expression and subcellular localization in the colon cancer cell lines examined. In conclusion, SOX9, β-catenin and PPARγ expression levels are deregulated in the CRC tissue, and in colon cancer cell lines ligand-dependent PPARγ activation unevenly influences SOX9 and β-catenin expression and subcellular localization, suggesting a variable mechanistic role in colon carcinogenesis.

Design of a prostate cancer patient navigation intervention for a Veterans Affairs hospital

BACKGROUND

Patient navigation programs have been launched nationwide in an attempt to reduce racial/ethnic and socio-demographic disparities in cancer care, but few have evaluated outcomes in the prostate cancer setting. The National Cancer Institute-funded Chicago Patient Navigation Research Program (C-PNRP) aims to implement and evaluate the efficacy of a patient navigation intervention for predominantly low-income minority patients with an abnormal prostate cancer screening test at a Veterans Affairs (VA) hospital in Chicago.

METHODS/DESIGN

From 2006 through 2010, C-PNRP implemented a quasi-experimental intervention whereby trained social worker and lay health navigators worked with veterans with an abnormal prostate screen to proactively identify and resolve personal and systems barriers to care. Men were enrolled at a VA urology clinic and were selected to receive navigated versus usual care based on clinic day. Patient navigators performed activities to facilitate timely follow-up such as appointment reminders, transportation coordination, cancer education, scheduling assistance, and social support as needed. Primary outcome measures included time (days) from abnormal screening to diagnosis and time from diagnosis to treatment initiation. Secondary outcomes included psychosocial and demographic predictors of non-compliance and patient satisfaction. Dates of screening, follow-up visits, and treatment were obtained through chart audit, and questionnaires were administered at baseline, after diagnosis, and after treatment initiation. At the VA, 546 patients were enrolled in the study (245 in the navigated arm, 245 in the records-based control arm, and 56 in a subsample of surveyed control subjects).

DISCUSSION

Given increasing concerns about balancing better health outcomes with lower costs, careful examination of interventions aimed at reducing healthcare disparities attain critical importance. While analysis of the C-PNRP data is underway, the design of this patient navigation intervention will inform other patient navigation programs addressing strategies to improve prostate cancer outcomes among vulnerable populations.

Clinical implications of the detection of circulating tumor cells in breast cancer patients

The detection of disseminated tumor cells in bone marrow is a common phenomenon seen in 30-40% of primary breast cancer patients. The presence of disseminated tumor cells at diagnosis as well as the persistence of disseminated tumor cells is strongly associated with poor clinical outcome. Since bone marrow biopsies are not well tolerated by many patients, the evaluation of circulating tumor cells in the blood might become a desired alternative. Circulating tumor cells are routinely detected, depending on stage of the disease and methodology, in 10-80% of breast cancer patients. Recent studies have shown a prognostic potential of circulating tumor cells in both primary and metastatic settings. The evaluation of circulating tumor cells may become one of the crucial markers for prediction of survival and therapy monitoring, and its characterization might enable specific targeting of minimal residual, and metastatic disease.

Patient-physician colorectal cancer screening discussions: delivery of the 5A's in practice

BACKGROUND

The U.S. Preventive Services Task Force advocates use of a 5A's framework (assess, advise, agree, assist, and arrange) for preventive health recommendations.

PURPOSE

To describe 5A content of patient-physician colorectal cancer (CRC) screening discussions and physician-recommended screening modality and to test if these vary by whether patient previously received screening recommendation.

METHODS

Direct observation of periodic health examinations in 2007-2009 among average-risk primary care patients aged 50-80 years due for screening. Qualitative content analyses conducted 2008-2010 used to code office visit audio-recordings for 5A and other discussion content.

RESULTS

Among study-eligible visits (N=415), 59% contained assistance (i.e., help scheduling colonoscopy or delivery of stool cards), but the assess, advise, and agree steps were rarely comprehensively provided (1%-21%), and only 3% included the last step, arrange follow-up. Almost all physicians endorsed screening via colonoscopy (99%), either alone (69%) or in combination with other tests (30%). Patients nonadherent to a prior physician screening recommendation (31%) were less likely to have the reason(s) for screening discussed (37% vs 65%) or be told the endoscopy clinic would call them for scheduling (19% vs 27%), and more likely to have fecal occult blood testing (FOBT) alone (34% vs 25%) or FOBT and colonoscopy recommended (24% vs 14%), and a screening plan negotiated (21% vs 14%). Significance level is p<0.05 for all contrasts.

CONCLUSIONS

Most patients due for CRC screening discuss screening with their physician, but with limited application of the 5A's approach. Opportunities to improve CRC screening decision-making are great, particularly among patients who are nonadherent to a prior recommendation from a physician.

Epidemiological study of colorectal adenoma and cancer in symptomatic patients in China between 1990 and 2009

OBJECTIVE

The best cure for colorectal cancer (CRC) lies on its early diagnosis and treatment. We aimed to provide the epidemiological features of advanced colorectal adenoma (A-CRA) and CRC in symptomatic patients and to determine whether the incidences of A-CRA and CRC increased simultaneously in China between 1990 and 2009.

METHODS

A total of 157,943 patients who had undergone a colonoscopy from 1990 to 2009 were enrolled, of which 6,777 patients had A-CRA and 3,503 had CRC. They were compared with controls in a stratified analysis. The detection rates of A-CRA and CRC in the 1990s and 2000s were also compared.

RESULTS

The detection rate of A-CRA increased 1.88-fold over the two decades, while that of CRC increased 0.66-fold. The percentages of patients with A-CRA and CRC who were elder than 50 years were significantly higher in the 2000s than those in the 1990s (P = 0.000). The changes of location of A-CRA and CRC during the two decades indicated a shift of lesions from the distal colon to proximal colon.

CONCLUSION

There was a significant increase in detection rate of A-CRA in the 2000s, but CRC did not increase at a similar speed. Our results indicated that the early detection and removal of colorectal adenoma in symptomatic patients might decrease the incidence of CRC.

IgH gene rearrangements as plasma biomarkers in Non- Hodgkin's lymphoma patients

New biomarkers with improved accuracy could be helpful for monitoring disease in patients with Non-Hodgkin's lymphomas (NHL). Towards this end, we have explored the feasibility of identifying the sequence of rearranged IgH genes using next-generation sequencing, then using PCR to detect specific rearranged DNA fragments in patients' plasma. By capturing and sequencing the IgH genomic regions (IgCap), we were able to detect and precisely determine the sequence of rearranged IgH loci in the tumors of three NHL patients. Moreover, circulating rearranged DNA fragments could be identified in the plasma of all three patients. Even in cases wherein tumor biopsies were unavailable, we were able to use the IgH capture approach to identify rearranged DNA loci in the plasma of 8 of 14 patients. IgCap may enable a more informed management of selected patients with NHL and other B-cell malignancies in the future.

The "10 keys" to healthy aging: 24-month follow-up results from an innovative community-based prevention program

The purpose of this report was to evaluate a prevention program to reduce risk factors for common diseases among older individuals in a lower income community. This randomized community-based study enrolled older adults into a Brief Education and Counseling Intervention or a Brief Education and Counseling Intervention plus a physical activity and (for those with hypertension) a dietary sodium intervention. Outcomes were collected on 389 adults with a mean age of 73.9 years over 24 months. Adherence to the "10 Keys" improved significantly in the proportion meeting goals for low-density lipoprotein cholesterol (+14%), bone mineral density testing (+11%), pneumonia vaccination (+11%), colonoscopy (+14%), and adherence to antihypertensive medication (+9%). This program resulted in significant reductions in key risk factors, increases in immunizations, and adherence to established prevention guidelines over 2 years. Further research is needed to refine the use of community health counselors for translating prevention knowledge into community settings. A major limitation of these studies is the low participation percentage.

Durable improvements in prostate cancer screening from online spaced education a randomized controlled trial

CONTEXT

Prostate cancer screening with prostate-specific antigen (PSA) is frequently performed, counter to clinical practice guidelines.

BACKGROUND

It was hypothesized that an e-mail-based intervention termed "spaced education" could reduce clinicians' inappropriate screening for prostate cancer.

DESIGN

The study was conducted as an RCT.

SETTING/PARTICIPANTS

The study involved 95 primary care clinicians in eight Veterans Affairs medical centers from January 2007 to February 2009.

INTERVENTION

Participants were randomized into two cohorts: spaced education clinicians received four isomorphic cycles of nine e-mails over 36 weeks (zero to two e-mails per week), whereas control clinicians received no intervention. Each e-mail presented a clinical scenario and asked whether it was appropriate to obtain a PSA test. Participants received immediate feedback after submitting their answers.

MAIN OUTCOME MEASURES

The primary outcome was the number and percentage of inappropriate PSA screening tests ordered. Inappropriate testing was defined as use of PSA for prostate cancer screening in patients aged >76 or <40 years. Appropriateness of screening was dichotomized based on patient age at time of screening. Patients with PSA testing for non-screening reasons were excluded using a validated protocol. Logistic regression with adjustment for patient clustering by clinician was performed. Analyses were conducted in 2009.

RESULTS

During the intervention period (Weeks 1-36), clinicians receiving spaced education e-mails ordered significantly fewer inappropriate PSA screening tests than control clinicians (10.5% vs 14.2%, p=0.041). Over the 72-week period following the intervention (Weeks 37-108), spaced education clinicians continued to order fewer inappropriate tests compared to controls (7.8% vs 13.1%, respectively, p=0.011), representing a 40% relative reduction in inappropriate screening.

CONCLUSIONS

Spaced education durably improves the prostate cancer screening behaviors of clinicians and represents a promising new methodology to improve patient care across healthcare systems.

Comparison of immunochemical and guaiac-based fecal occult blood test in screening and surveillance for advanced colorectal neoplasms: a meta-analysis

OBJECTIVE

To systematically evaluate whether immunochemical fecal occult blood tests (iFOBT) could improve clinical performance and test accuracy in screening and surveillance for advanced colorectal neoplasms.

METHODS

Eligible articles were identified by searches of electronic databases. All randomized trials and diagnostic cohort trials directly comparing iFOBT with guaiac-based FOBT (gFOBT) were included. A statistical analysis was performed using RevMan 4.2.8. A sensitivity, specificity and summary receiver operating characteristic curve was performed using Meta Disc.

RESULTS

We identified five randomized trials and 11 diagnostic cohort trials. In the randomized trials, the detection rates of advanced colorectal neoplasms with iFOBT or gFOBT were 2.23 percent and 1.24 percent, respectively. The pooled odds ratio (OR) was 1.50 (95% CI 0.94-2.39). In cohort trials, the advanced neoplasm detection rates of iFOBT or gFOBT were 1.44 percent and 0.50 percent (OR 1.99, 95% CI 1.24-3.19) in the average-risk screened population, and were 8.8 percent and 7.1 percent (OR 1.27, 95% CI 1.01-1.60) in diagnosed patients scheduled for colonoscopy. The sensitivity of iFOBT (0.67, 95% CI 0.61-0.73) was superior to that of gFOBT (0.54, 95% CI 0.48-0.60), as well as the specificities (0.85, 95% CI 0.83-0.87 vs 0.80, 95% CI 0.78-0.82) and positive predictive values (0.41 vs 0.29) in cohort trials of diagnosed patients.

CONCLUSION

Our review suggests that iFOBT could perform better in increasing the detection rate of advanced colorectal neoplasm than gFOBT and possesses higher sensitivity and specificity in the surveillance of advanced colorectal neoplasm for patients.

Patient education cards for skin cancer detection and treatment

Over 1.3 million cases of skin cancer occur annually in the USA, but no uniform or evidence-based screening guidelines exist. During a 1-year intervention, a patient education tool was distributed to patients. Billing records were utilized to compare detection and treatment rates for cancerous and precancerous skin lesions during the intervention to a historical control. No significant change in detection rates was demonstrated (RR = 1.0, p = 0.88). However, the number of procedures performed for malignant and pre-malignant skin lesions increased significantly (RR = 2.4, p < 0.0001). The patient education tool created clinically significant behavioral change at a low monetary and time cost.

Molecularly targeted therapy in hepatocellular carcinoma

With an annual incidence of over 660,000 deaths, hepatocellular carcinoma (HCC) is the third leading cause of cancer death globally. This disease is often diagnosed at an advanced stage, when potentially curative therapies are not feasible. HCC is highly resistant to conventional systemic therapies and prognosis for advanced HCC patients remains poor. Given the clear need, clinical development of novel therapeutic agents in HCC has begun in earnest. Our recent knowledge of the molecular mechanisms responsible of tumor initiation and progression has identified several potential molecular targets in HCC. These targets are the receptor tyrosine kinase-activated pathways, which include the Raf/MEK/ERK, PI-3K/Akt/mTOR, and Jak/Stat. Sorafenib is the multikinase inhibitor that has shown modest survival benefits in advanced HCC in two randomized controlled trials, supporting the use of molecularly targeted therapies in treatment of HCC. A number of strategies including monoclonal antibodies and tyrosine kinase inhibitors such as erlotinib, sunitinib, vandetanib, cediranib, brivanib, foretinib, and dovitinib have been developed and tested in various phases of clinical trials. The successful development of these novel targeted agents in the future will be dependent on the selection of patient populations that are most likely to derive clinical benefit, optimization of the dose used and schedules, and investigation of combined therapies. This review describes evolving molecular targeted agents, their common adverse side effects, and its potential use in management of HCC.

An up to date look at lung cancer screening

Lung cancer is the leading cause of cancer-related death worldwide. At the time of initial presentation, most patients are at an advance stage of disease and have a poor associated prognosis. Those diagnosed and treated at earlier stages have a significantly better outcome with 5-year survival for stage I disease approaching 75%. Ideally a screening strategy for lung cancer would detect disease at an earlier stage and allow for potential surgical cure. The purpose of this review is to examine past and current evidence as it relates to lung cancer screening.

Influence of number of children on cancer screening among adults in the United States

OBJECTIVE

To investigate the influence of children in the household on the likelihood of reporting cancer screening among adult men and women living in the United States.

METHODS

2004-2006 Medical Expenditure Panel Surveys (MEPS) were used to calculate the probability of self-reported cancer screening by number of children for adult men and women with adjustment for age, sex, marital status, race, education, current smoking status, obesity status, health insurance and having a usual health-care provider.

RESULTS

The largest percentage of persons who had cancer screening was among respondents with no children in the household. In multivariate results, the probability of endoscopy was lower for persons with one child (24%) and two or more children (21%) in comparison with persons with no children living in the household (30%). Prostate-specific antigen (PSA) testing was lower among men with one child (17%) and two or more children (14%) in comparison with no children (22%). Pap smears were lower for women with two or more children (50%) but not different for women with one child (55%) in comparison with no children (56%). Mammograms were lower for women with one child (48%) and two or more children (42%) in comparison with no children in the household (55%).

CONCLUSION

Across several different cancer screening modalities, the probability of screening is lower as the number of children in the household increases. Children may be an additional barrier to screening beyond factors such as socioeconomic status and access to care.

Breast, colorectal and prostate cancer screening for cancer survivors and non-cancer patients in community practices

BACKGROUND

Cancer survivors have cancer surveillance and preventive screening needs that require monitoring. Little is known regarding their patterns of care in community primary care practices.

METHODS

Secondary analysis of 750 baseline patient surveys and medical record audits for patients ages 50+ years in 25 community-based primary care practices (N = 109 survivors and 641 noncancer patients).

RESULTS

Patient self-reported screening rates for breast cancer (72%), colorectal cancer (81%) and prostate cancer (77%) were higher for cancer survivors compared to noncancer patients (69%, 67%, 53%, respectively). Screening rates documented in the primary care records were lower for all cancers. Cancer survivors were more likely than others to report having been screened for colorectal cancer (P = 0.002) even after excluding colorectal cancer survivors from the analysis (P = 0.034). Male cancer survivors were more likely to report being screened for prostate cancer than those without cancer (P < 0.001), even after excluding prostate cancer survivors (P = 0.020). There were no significant differences in either self-reported or medical record report of breast cancer screening rates among cancer survivors and noncancer patients.

CONCLUSIONS

Cancer survivors were more likely to self-report receipt of cancer screening than noncancer patients. Medical record reports of cancer screening were lower than self-reports for cancer survivors and noncancer patients. Identifying factors that affect cancer screening among cancer survivors is important and has implications for intervention design.

The epothilone B analogue ixabepilone in patients with advanced hepatobiliary cancers: a trial of the University of Chicago Phase II Consortium

PURPOSE

Hepatobiliary cancers respond poorly to cytotoxic chemotherapy. We evaluated the activity and safety of ixabepilone, an epothilone B analogue which stabilizes microtubules, in a phase II trial in patients with advanced cancers of the gallbladder, bile duct, and liver.

METHODS

Eligible patients had previously-untreated, histologically-proven unresectable hepatobiliary cancer. Ixabepilone, 40 mg/m(2), was administered intravenously over 3 h every 21 days.

RESULTS

Between January 2002 and April 2005, 54 patients (19 hepatocelluar carcinoma, 13 cholangiocarcinomas, 22 gallbladder carcinomas) were enrolled; 47 patients were evaluable for efficacy. The objective response rate was 8.5%; 51% had stable disease. Median overall survival was 7.0 months (95% CI, 5.0 to 10.8 months) and median progression-free survival was 2.6 months (95% CI, 1.4 to 4.1 months). Grade 3/4 toxicities included neutropenia (39%), fatigue (9%), allergic/hypersensitivity reaction (4%) and sensory neuropathy (4%).

CONCLUSION

Single agent ixabepilone has limited activity in advanced hepatobiliary cancers.

The knowledge and practice of breast self-examination among healthcare workers in Kayseri, Turkey

Breast cancer is the most common cancer type and cause of death among women in many countries. Monthly breast self-examination (BSE) is an effective diagnostic method for breast cancer. This study aimed to determine the knowledge level and practice frequency of BSE among healthcare workers in Kayseri, Turkey. Data were collected via a questionnaire that was prepared based on information in the literature. The questionnaire was composed of 2 sections: sociodemographic characteristics and practice and knowledge related to BSE. The sample group included 246 healthcare workers. Mann-Whitney U, Kruskal-Wallis H, (post hoc) Dunn, and chi tests were used in the analyses of data. The mean (SD) age of the respondents was 29.0 (5.6) years. Most (58.1%) were married, and a family history of breast cancer was reported by 12.2%. Of the respondents, 35% stated that they did not know how to conduct an examination of their breasts. Although 52.4% (n = 129) of the women reported that they performed BSE, only 17.0% (n = 22) reported doing so on a monthly basis. The practice of BSE was significantly associated with older, more educated medical secretaries; a positive personal history of breast problems; and a positive family history of breast cancer (P < .05). Healthcare workers had a low mean level of knowledge about the practice of BSE (mean [SD] score, 11.70 [10.07]; range, 0-40). The scores of the women who stated that they practiced BSE were significantly higher (P = .000) than those who reported that they did not. Healthcare workers need to improve their knowledge of and sensitivity toward BSE.

Polymeric nanomedicine for cancer MR imaging and drug delivery

Multifunctional nanomedicine is emerging as a highly integrated platform that allows for molecular diagnosis, targeted drug delivery, and simultaneous monitoring and treatment of cancer. Advances in polymer and materials science are critical for the successful development of these multi-component nanocomposites in one particulate system with such a small size confinement (<200 nm). Currently, several nanoscopic therapeutic and diagnostic systems have been translated into clinical practice. In this feature article, we will provide an up-to-date review on the development and biomedical applications of nanocomposite materials for cancer diagnosis and therapy. An overview of each functional component, i.e. polymer carriers, MR imaging agents, and therapeutic drugs, will be presented. Integration of different functional components will be illustrated in several highlighted examples to demonstrate the synergy of the multifunctional nanomedicine design.

Skin cancer-related prevention and screening behaviors: a review of the literature

Primary prevention and early detection continue to be of paramount importance in addressing the public health threat of skin cancer. The aim of this systematic review was to provide a comprehensive overview of the prevalence and correlates of skin cancer-related health behaviors in the general population. To achieve this aim, 91 studies published in international peer-reviewed journals over the past three decades were reviewed and synthesized. Reported estimates of sunscreen use varied considerably across studies, ranging from 7 to 90%. According to self-report, between 23 and 61% of individuals engage in skin self-examination at least once per year, and the documented prevalence of annual clinical skin examination ranges from 8 to 21%. Adherence to sun protection and screening recommendations is associated with a range of factors, including: female gender, sun-sensitive phenotype, greater perceived risk of skin cancer, greater perceived benefits of sun protection or screening, and doctor recommendation for screening. The literature suggests that a large proportion of the general population engage in suboptimal levels of sun protection, although there is substantial variability in findings. The strongest recommendation to emerge from this review is a call for the development and widespread use of standardized measurement scales in future research, in addition to more studies with a population-based, multivariate design. It is also recommended that specific targeted interventions are developed to increase the prevalence of preventative and early intervention behaviors for the control of skin cancer.

Barriers to colorectal cancer screening: A case-control study

AIM: To investigate barriers to colorectal cancer (CRC) screening in a community population.

METHODS: We conducted a community-based case-control study in an urban Chinese population by questionnaire. Cases were selected from those completing both a fecal occult blood test (FOBT) case and colonoscopy in a CRC screening program in 2004. Control groups were matched by gender, age group and community. Control 1 included those having a positive FOBT but refusing a colonoscopy. Control 2 included those who refused both an FOBT and colonoscopy.

RESULTS: The impact of occupation on willingness to attend a colorectal screening program differed by gender. P for heterogeneity was 0.009 for case vs control group 1, 0.01 for case versus control group 2, and 0.80 for control group 1 vs 2. Poor awareness of CRC and its screening program, characteristics of screening tests, and lack of time affected the screening rate. Financial support, fear of pain and bowel preparation were barriers to a colonoscopy as a screening test. Eighty-two percent of control group 1 and 87.1% of control group 2 were willing attend if the colonoscopy was free, but only 56.3% and 53.1%, respectively, if it was self-paid. Multivariate odds ratios for case vs control group 1 were 0.10 among those unwilling to attend a free colonoscopy and 0.50 among those unwilling to attend a self-paid colonoscopy.

CONCLUSION: Raising the public awareness of CRC and its screening, integrating CRC screening into the health care system, and using a painless colonoscopy would increase its screening rate.

Prostate-specific antigen testing among the elderly in community-based family medicine practices

BACKGROUND

Controversy surrounds prostate-specific antigen (PSA) testing for prostate cancer screening, especially among elderly men aged 75 and older. This study examines whether patient age results in differential use of PSA testing and if organizational attributes such as communication, stress, decision making, and practice history of change predict PSA testing among men aged 75 and older.

METHODS

Data came from chart audits of 1149 men > or =50 years old who were patients of 46 family medicine practices participating in 2 northeastern practice-based research networks. Surveys administered to clinicians and staff in each practice provide practice-level data. A stratified Cochran-Mantel-Haenszel test was applied to examine whether PSA testing decreased with age. Hierarchical logistic regression analyses determined characteristics associated with PSA testing for men > or =75 years old.

RESULTS

Comparable rates for annual PSA testing of 77.2% for men aged 50 to 74 years and 74.6% for men > or =75 years old were reported. The Cochran-Mantel-Haenszel test indicated no significant change in trend. Hierarchical models suggest that practice communication is the only organizational attribute that influences PSA testing for men 75 years of age or older (odds ratio, 5.04; P = .022). Practices with higher communication scores (eg, promoted constructive work relationships and a team atmosphere between staff and clinicians) screened men aged 75 and older at lower rates than others.

CONCLUSIONS

Elderly men in community settings receive PSA testing at rates comparable to their younger counterparts even though major clinical practice guidelines discourage the practice for this population. Intraoffice practice interventions that target PSA testing to the most appropriate populations and focus on communication (both within the office and with patients) are needed.

Diagnostic and prognostic impact of osteopontin expression in endometrial cancer

The role of osteopontin as a biomarker in endometrial cancer has not been conclusively established. We evaluated the expression and potential of osteopontin as a biomarker for endometrial cancer. Real-time polymerase chain reaction and immunohistochemistry revealed osteopontin overexpression in endometrial cancer. The plasma osteopontin level in endometrial cancer was significantly higher than in healthy controls (P< 0.001). In FIGO stage I endometrial cancer, osteopontin correctly identified 18 of 29 cases (62.1%) that were not detected by CA125. By Cox multivariate analysis, osteopontin positivity was an independent prognostic factor for disease-free survival (hazard ratio = 3.18, P= 0.035).

Strategic health communication across the continuum of breast cancer care in limited-resource countries

Strategic health communication is a critical component of healthcare that should be implemented across the continuum of care. Recognizing the importance of communication strategies and incorporating such strategies into healthcare policies, programs, and interventions is essential to the effective delivery of breast cancer care. The authors reviewed relevant literature and suggested practical evidence-based strategies for effective communication interventions across the continuum of care for breast cancer patients, including early detection, diagnosis, treatment, survivorship, palliative care, and end-of-life care. Examples were provided from limited-resource nations to support health communication recommendations.

Knowledge of risk factors, beliefs and practices of female healthcare professionals towards breast cancer in a tertiary institution in Lagos, Nigeria

Background

Breast cancer is the leading female malignancy in Nigeria. Screening for early detection has led to reduction in mortality from the disease. It is known that attitudes of physicians and motivation by community nurses influence uptake of screening methods by women. This study aims to investigate knowledge of breast cancer risk factors, beliefs about treatment and practice of screening methods among a cohort of female healthcare professionals in Lagos, Nigeria.

Methods

A cross-sectional study was conducted using a self-administered questionnaire to assess the knowledge of breast cancer risk factors, beliefs about treatment and practice of screening methods among 207 female doctors, nurses and other healthcare professionals working in a university teaching hospital in Lagos, Nigeria. Stratified random sampling method was employed. Chi square test, analysis of variance and Mantel-Haenszel test were performed in data analysis using SPSS v10.0 and Epi Info version 6 statistical packages.

Results

Female doctors obtained a mean knowledge score of 74% and were the only professional group that had satisfactory knowledge of risk factors. Majority (86%) believed that early breast cancer is curable while half of participants believed that prayer can make breast cancer disappear from the affected breast. Eighty three percent practice breast self-examination (BSE) once a month and only 8% have ever had a mammogram. Age, knowledge of risk factors, profession and beliefs were not significantly associated with rate of BSE in this study.

Conclusion

Results from this study suggest the need for continuing medical education programmes aimed at improving knowledge of breast cancer among female healthcare providers other than doctors.

Sorafenib and rapamycin induce growth suppression in mouse models of hepatocellular carcinoma

Hepatocellular carcinoma (HCC) is the fifth most common malignancy worldwide. Vascular endothelial growth factor, platelet derived growth factor and the Raf/mitogen-activated protein kinase/extracellular signal regulated kinase (Raf/MEK/ERK) signalling pathway regulates the growth, neovascularization, invasiveness and metastatic potential of HCC. In this study, we investigated the in vivo antitumour activity and mechanisms of action of sorafenib tosylate on four patient-derived HCC xenografts. Sorafenib dosed at 50 mg/kg and 100 mg/kg inhibited tumour growth by 85% and 96%, respectively. Sorafenib-induced growth suppression and apoptosis were associated with inhibition of angiogenesis, down-regulation of phospho-platelet-derived growth factor receptor beta Tyr1021, phospho-eIF4E Ser209, phospho-c-Raf Ser259, c-Raf, Mcl-1, Bcl-2, Bcl-x and positive cell cycle regulators, up-regulation of apoptosis signalling kinase-1, p27 and p21. Expression of IGF-1Rbeta and phosphorylation of c-Raf Ser338, MEK1/2 Ser217/221 and ERK1/2 Thr202/Tyr204 were increased by sorafenib treatment. Phosphorylation of mammalian target-of-rapamycin (mTOR) targets (p70S6K, S6R and 4EBP1) was reduced by sorafenib in sorafenib-sensitive lines but activated in sorafenib-less-sensitive 10-0505 xenograft. Sorafenib-induced phosphorylation of c-met, p70S6K and 4EBP1 was significantly reduced when 10-0505 cells were co-treated with anti-human anti-HGF antibody, suggesting that treatment with sorafenib leads to increased HGF secretion and activation of c-met and mTOR targets. Treatment of 10-0505 tumours with sorafenib plus rapamycin resulted in growth inhibition, inhibition of vascular endothelial growth factor receptor-2 phosphorylation, increased apoptosis and completely blocked sorafenib-induced phosphorylation of mTOR targets and cyclin B1 expression. These data also provide a strong rationale for clinical investigation of sorafenib in combination with mTOR inhibitors in patients with HCC.

Screening colonoscopies by primary care physicians: a meta-analysis

PURPOSE

There is currently too few endoscopists to enact a national colorectal cancer screening program with colonoscopy. Primary care physicians could play an important role in filling this shortage by offering screening colonoscopy in their practice. The purpose of this study was to examine the safety and effectiveness of colonoscopies performed by primary care physicians.

METHODS

We identified relevant articles through searches of MEDLINE and EMBASE bibliographic databases to December 2007 and through manual searches of bibliographies of each citation. We found 590 articles, 12 of which met inclusion criteria. Two authors independently abstracted data on study and patient characteristics. Descriptive statistics were performed. For each outcome measure, a random effects model was used to determine estimated means and confidence intervals.

RESULTS

We analyzed 12 studies of colonoscopies performed by primary care physicians, which included 18,292 patients (mean age 59 years, 50.5% women). The mean estimated adenoma and adenocarcinoma detection rates were 28.9% (95% confidence interval [CI], 20.4%-39.3%) and 1.7% (95% CI, 0.9%-3.0%), respectively. The mean estimated reach-the-cecum rate was 89.2% (95% CI, 80.1%-94.4%). The major complication rate was 0.04% (95% CI, 0.01%-0.07%); no deaths were reported.

CONCLUSIONS

Colonoscopies performed by primary care physicians have quality, safety, and efficacy indicators that are comparable to those recommended by the American Society of Gastrointestinal Endoscopy, the American College of Gastroenterology, and the Society of American Gastrointestinal Endoscopic Surgeons. Based on these results, colonoscopy screening by primary care physicians appears to be safe and effective.