Effectiveness of androgen deprivation therapy in prolonging survival of older men treated for locoregional prostate cancer

Medical Misadventures as Errors and Mistakes and Motor Vehicular Accidents in the Disproportionate Burden of Childhood Mortality among Blacks/African Americans in the United States: CDC Dataset, 1968-2015

PURPOSE

Racial disparities in infant mortality in the United States persist after adjustment for known confounders of race and mortality association, as well as heterogeneity assessment. Epidemiologic and clinical data continue to show the survival disadvantages of Black/AA children: when Black/AAs are compared to whites, they are three times as likely to die from all-cause mortality. The persistent inability to remove the variance in race-mortality association is partly due to unobserved, unmeasured, and residual confounding, as well as implicit biases in public health and clinical medicine in health equity transformation. This current epidemiologic-perspective explanatory model study aimed to examine the possible explanation of racial differences in U.S. infant mortality using medical misadventures as errors and mistakes, and infants' involvement in motor vehicular traffic accidents.

MATERIALS AND METHOD

Using CDC WONDER ecologic data from 1968 to 2015, we assessed the infant mortality-rate ratio and percent change associated with medical misadventures as well as motor vehicular accidents or trauma. The rate ratio and percent change were estimated using stratification analysis and trend homogeneity, respectively.

RESULTS

There was a Black-white racial difference in medical misadventures during the study period. Relative to the years 1968-1978 (rate ratio [RR], 1.43), there was a steady increase in the mortality-rate ratio in 1979-1998 (52%, RR = 1.52), and mortality was more than two times as likely in 1999-2015 (RR = 2.37). However, with respect to motor vehicular accident/trauma mortality, the mortality ratio, although lower among Blacks in 1968-1978 (RR, 0.92), increased in 1979-1998 by 27% (RR = 1.27) but decreased in 1999-2015 (RR, 1.17), though there was still an excess of 17% mortality among Black/AAs. The percent change for medical misadventures indicated an increasing trend from 9.3% in 1998 to 52% in 2015. However, motor vehicular-related mortality indicated a positive trend in 1998 (38.5%) but a negative trend in 2015 (-8.4%).

CONCLUSIONS

There were substantial race differentials or variances in infant mortality associated with medical misadventures compared to traffic accidents, and Black/AA children relative to whites experienced a survival disadvantage. These comparative findings are suggestive of medical misadventures and motor vehicular trauma as potential explanations for some of the persistent Black-white disparities in overall infant mortality in the U.S. From these findings, we recommend a national effort to address these issues, thus narrowing the observed disparities in the U.S. infant mortality burden among Black/AAs.

Black-White Risk Differentials in Pediatric COVID-19 Hospitalization and Intensive Care Unit Admissions in the USA

Purpose

The COVID-19 morbidity with SARS-CoV-2 as a causative pathogenic microbe remains a pandemic with children experiencing less mortality but with severe manifestations. The current study aimed to assess SARS-CoV-2 cumulative incidence, COVID-19 hospitalization, and ICU admission with respect to racial differentials.

Materials and Methods

A cross-sectional nonexperimental epidemiologic design was used to examine pediatric COVID-19 data from CDC during 2020. The variables assessed were ICU admissions, hospitalization, sex, race, and region. The Chi-Square (X²) statistic was used to examine the independence of the variables by race, while the binomial regression model was used to predict racial risk differentials in hospitalization and ICU admissions.

Results

The pediatric COVID-19 data observed the cumulative incidence of hospitalization to be 96,376, while ICU admission was 12,448. Racial differences were observed in hospitalization, ICU admissions, sex, and region. With respect to COVID-19 hospitalization, Black/African American (AA) children were two times as likely to be hospitalized compared to their White counterparts, prevalence risk ratio (pRR) = 2.20, 99% confidence interval (CI = 2.12–2.28). Similarly, Asians were 45% more likely to be hospitalized relative to their White counterparts, pRR = 1.45, 99% CI = 1.32–1.60. Regarding ICU admission, there was a disproportionate racial burden, implying excess ICU admission among Black/AA children relative to their White counterparts, pRR = 5.18, 99% CI = 4.44–6.04. Likewise, Asian children were 3 times as likely to be admitted to the ICU compared to their White counterparts, pRR = 3.36, 99% CI = 2.37–4.77. Additionally, American Indians/Alaska Natives were 2 times as likely to be admitted to ICU, pRR = 2.54, 99% CI = 0.82–7.85.

Conclusion

Racial disparities were observed in COVID-19 hospitalization and ICU admission among the US children, with Black/AA children being disproportionately affected, implying health equity transformation.

Targeting CDCP1 gene transcription coactivated by BRD4 and CBP/p300 in castration-resistant prostate cancer

CUB domain-containing protein 1 (CDCP1), a transmembrane protein with tumor pro-metastatic activity, is highly expressed in late-stage and castrate-resistant prostate cancer (CRPC). However, the molecular mechanism driving CDCP1 overexpression in CRPC progress remains elusive. Here we report that transcription cofactors BRD4 and CBP/p300 co-regulate transcriptional expression of CDCP1 in CRPC tumorigenesis. In contrast to androgen receptor (AR) in CRPC, increased expression of BRD4 and CBP/p300 is strongly correlated with CDCP1 gene amplification. Combined knockdown or dual-inhibition of BRD4 and CBP/p300 down-regulated CDCP1 transcription and downstream PI3K/AKT and/or SRC/MAPK signaling pathways in CRPC cells much more so than single-protein perturbation. Our biochemical and structural analyses further showed that NEO2734, a dual-inhibitor targeting BRD4 and p300 bromodomains exhibits greater efficacy than single inhibitors for BRD4 or CBP/p300 in suppressing CDCP1 transcriptional expression and its downstream signaling pathways in CRPC cell proliferation and metastasis. Our study illustrates that targeting CDCP1 through dual-inhibition of BRD4 and CBP/p300 represents a synergistic therapeutic strategy for new treatment of CRPC.

Association between Androgen Deprivation Therapy and Risk of Dementia in Men with Prostate Cancer

The risk of dementia after androgen deprivation therapy (ADT) in patients with advanced prostate cancer (PCa) remains controversial. This study aimed to evaluate the association between ADT and the incidence of dementia in patients with PCa. We identified patients newly diagnosed with PCa in the National Health Insurance Database of Taiwan from 1 January 2002 to 30 June 2016 and in The Health Improvement Network of the United Kingdom (UK) from 1 January 1998 to 31 March 2018. We classified patients with PCa into ADT and ADT-naïve groups. Propensity score (PS) methods were used to minimize the differences in characteristics between the groups. We performed a Cox proportional hazard model to obtain the adjusted hazard ratio (HR) to compare the incidence of dementia between the groups. Our ADT group comprised 8743 and 73,816 patients in Taiwan and the UK, respectively, which were matched 1:1 to ADT-naïve patients by PS. The incidence rates of dementia in the ADT group were 2.74 versus 3.03 per 1000 person-years in the ADT naïve groups in Taiwan, and 2.81 versus 2.79 per 1000 person-years in the UK. There was no statistical difference between ADT and ADT-naïve groups (adjusted HR: 1.12; 95% confidence interval (CI): 0.87-1.43 in Taiwan and adjusted HR: 1.02; 95% CI: 0.85-1.23 in the UK). We found no association between the incidence of dementia and ADT in patients with advanced PCa in either database. Further studies are warranted to evaluate other possible triggers of incident dementia in patients receiving ADT for advanced PCa.

Social gradient predicts survival disadvantage of African Americans/Black children with lymphoma

BACKGROUND

Cancer is the leading cause of disease-related mortality among children, 0-14 years, and lymphoma, a malignant neoplasm of the lymphoid cells, mostly lymphatic B and T cells is common among children. The current study aimed to assess the cumulative incidence (CmI), mortality, and survival in pediatric lymphoma.

MATERIALS AND METHODS

A retrospective cohort was utilized to examine children, 0-19 years with lymphoma for CmI, mortality and survival from the Surveillance, Epidemiology, and End Results (SEER) data. The variables assessed included social determinants of health, namely urbanity, median household income, and race. While chi square was used to characterize study variables by race, binomial regression was employed for mortality risk. The Cox proportional hazard model was used for survival modeling.

RESULTS

The CmI was higher among white children (76.67%) relative to Black/African American (AA, 13.44%), American Indian/Alaskan Native (AI/AN, 0.67%), as well as Asian/Pacific Islander (A/PI, 7.53%). With respect to mortality, there was excess mortality among Black/AA children compared to white children, Risk Ratio (RR) = 1.54, 95% CI, 1.33-1.79. Relative to whites, Blacks were 52% more likely to die, Hazard Ratio (HR) = 1.52, 95% CI, 1.30-1.78. Survival disadvantage persisted among Blacks/AA after controlling for the other confoundings, adjusted hazard ratio (aHR) = 1.54, 99% CI, 1.24-1.91.

CONCLUSION

In a large cohort of children with lymphoma, Black/AA children relative to whites presented with survival disadvantage, which was explained by urbanity and median household income, suggestive of transforming the physical and social environments in narrowing the racial differences in pediatric lymphoma survival in the US.

Implication of Vaginal and Cesarean Section Delivery Method in Black-White Differentials in Infant Mortality in the United States: Linked Birth/Infant Death Records, 2007-2016

Racial/ethnic disparities in infant mortality (IM) continue to persist in the United States, with Black/African Americans (AA) being disproportionally affected with a three-fold increase in mortality compared to Whites. Epidemiological data have identified maternal characteristics in IM risk such as preeclampsia, eclampsia, maternal education, smoking, maternal weight, maternal socioeconomic status (SES), and family structure. Understanding the social gradient in health including implicit bias, as inherent in the method of labor and delivery and the racial heterogeneity, may facilitate intervention mapping in narrowing the Black-White IM risk differences. We aimed to assess the temporal/racial trends and the methods of delivery, mainly vaginal vs. cesarean section (C-section) as an exposure function of IM. The United States linked birth/infant death records (2007-2016) were used with a cross-sectional ecological design. The analysis involved chi squared statistic, incidence rate estimation by binomial regression model, and period percent change. Of the 40,445,070 births between 2007 and 2016, cumulative mortality incidence was 249,135 (1.16 per 1000). The IM rate was highest among Black/AA (11.41 per 1000), intermediate among Whites (5.19 per 1000), and lowest among Asian /Pacific Islanders (4.24 per 1000). The cumulative incidence rate difference, comparing vaginal to cesarean procedure was 1.73 per 1000 infants, implying excess IM with C-section. Compared to C-section, there was a 31% decreased risk of IM among mothers with vaginal delivery, rate ratio (RR) = 0.69, 95% confidence interval (CI): 0.64-0.74. Racial disparities were observed in the method of delivery associated with IM. Black/AA mothers with vaginal delivery had a 6% decreased risk of IM compared to C-section, RR = 0.94, 95% CI: 0.92-0.95, while Whites with vaginal delivery had a 38% decrease risk of IM relative to C-section, RR= 0.68, 95% CI: 0.67-0.69, p < 0.001. Infant mortality varied by race, with Black/AA disproportionally affected, which is explained in part by labor and delivery procedures, suggestive of reliable and equitable intrapartum assessment of Black/AA mothers during labor, as well as implicit bias marginalization in the healthcare system.

Lower Regional Pediatric In-hospital Mortality Albeit Racial/ethnic Disparities

PURPOSE

Variability in pediatric morbidity and mortality tends to be influenced by several factors including though not limited to social determinants of health, namely health inequity as an exposure function of health disparities. We aimed to assess the cumulative incidence of pediatric mortality, racial/ethnic disparities, and the predisposing factors for the disparities.

METHOD

The current study retrospectively examined the Nemours/Alfred I. duPont Hospital for Children medical records of 16,121 patients diagnosed with any pediatric condition during 2009 and 2010.

RESULTS

In-hospital pediatric mortality cumulative incidence was relatively low (80 deaths, 0.49%) when compared with similar settings in the U.S. (national average range, 0.8e1.1%) during the same period. Compared with whites/Caucasians, mortality was higher among blacks/African Americans, prevalence odds ratio (POR), 1.06, 95% CI, 0.77e1.45, and higher for some other race, POR, 1.48, 95% CI, 1.06e2.10. After controlling for potential confounders (severity of illness, insurance status, and length of stay), racial differences in pediatric mortality did not persist between whites and some other race, adjusted POR, 1.08, 99% CI, 0.75e1.57.

CONCLUSIONS

In-hospital pediatric mortality cumulative incidence was relatively low in our region, and racial disparities exist but did not persist after controlling for confounders. These findings are suggestive of the importance of social determinants of health namely quality care, adequate medical insurance, and early detection, diagnosis in pediatric morbidity and epigenomic alterations, as well as the need to go beyond the "close medical model" to improve pediatric morbidity and survival by addressing health inequity as a function of health disparities.

Racial, Socioeconomic, and Geographic Disparities in the Receipt, Timing to Initiation, and Duration of Adjuvant Androgen Deprivation Therapy in Men with Prostate Cancer

OBJECTIVE

This retrospective cohort study aims to examine the receipt, timing to initiation, and duration of androgen deprivation therapy (ADT) in men with prostate cancer by race/ethnicity, socioeconomic status, and geographic location.

METHODS

The study population are patients from Surveillance, Epidemiology, and End Results (SEER)-Medicare linked database, who were 66 years or older and newly diagnosed with stage III and IV prostate cancer in 1992-2009 and underwent radiation therapy, where ADT was proven to be highly beneficial and its use was considered as most appropriate (n = 12,170). We use logistic regression to examine the receipt of ADT and linear regression to study factors associated with time to ADT initiation while controlling for baseline characteristics.

RESULTS

Overall, 77% of eligible patients received at least one form of ADT in combination with radiation therapy, of which 12% underwent orchiectomy and the rest received ADT, and 77.2% of non-Hispanic white and 80.7% of Hispanic patients received ADT compared to 73.8% of non-Hispanic black. After adjustment for demographic and tumor characteristics, black men and men of other races are less likely to receive ADT compared to white counterparts (OR = 0.64 and 0.74, respectively). The median time from cancer diagnosis to ADT initiation is 2 months. Once initiated, men received a median of seven drug injections. After controlling for covariates, race/ethnicity and geographic location (SEER areas) are associated with early initiation of therapy. White, Hispanic men and men living in the South initiate ADT earlier.

CONCLUSION

Significant racial disparities exist in the receipt and use of this highly beneficial therapy, and there are geographic variations in the utilization of this therapy.

Unequal Cumulative Incidence and Mortality Outcome in Childhood Brain and Central Nervous System Malignancy in the USA

BACKGROUND

While survival in overall pediatric malignancy has improved during recent decades, brain/central nervous system (CNS) tumors has not demonstrated comparable survival advantage. Incidence and mortality data in this malignancy continue to illustrate race and sex differences; however, there are few data in the pediatric setting. This study sought to characterize brain/CNS tumors by socio-demographic and assess racial and sex variances in both cumulative incidence and mortality.

METHODS

A retrospective cohort design with Surveillance, Epidemiology and End Results (SEER) 1973-2014 was used for the assessment of children aged < 1-19 years diagnosed with brain/CNS tumors. The age-adjusted incidence rates were used for temporal trends, percent change, and annual percent change. We utilized binomial regression model to determine the exposure effect of race and sex on cancer mortality, adjusting for potential confounders.

RESULTS

Childhood brain/CNS tumor cumulative incidence (CmI) continues to rise in annual percent change, and mortality varied by race, sex, and year of diagnosis. The CmI was highest among whites, intermediate among blacks, and lowest among Asians, as well as lower in females relative to that in males. Compared to whites, blacks were 21% more likely to die from brain/CNS tumors [risk ratio (RR) 1.21, 95% confidence interval (C.I.) 1.13-1.28], while males were 4% more likely to die relative to females (RR 1.04, 95% C.I. 1.00-1.08). After controlling for age, sex, and tumor grade, racial disparities persisted, with 16% increased risk of dying among blacks relative to whites [adjusted risk ratio 1.16, (99% C.I.) 1.08-1.25, p < 0.001].

CONCLUSION

The cumulative incidence of brain/CNS malignancy is higher among whites relative to that in blacks; however, blacks experienced survival disadvantage even after adjustment for potential tumor prognostic and predisposing factors.

Implication of Socio-Demographics on Cognitive-Related Symptoms in Sports Concussion Among Children

Background

Sports-related concussion remains a public health challenge due to its morbidity and mortality. One of the consequences of concussion is cognitive impairment (CI) and cognitive-related symptoms (CRS) which determine, to some extent, physical and behavioral functioning of children who sustain concussion. Despite the high prevalence of CI and CRS associated with concussion, the risk factors are not fully understood. We aimed to characterize CRS and to examine its relationship with race, ethnicity, age, insurance, and sex in a pediatric population.

Methods

A retrospective cohort (case-only) design was used to assess CRS prevalence and its relationship with race and sex using a pediatric hospital’s electronic medical records. A consecutive sample was used with 1429 cases between 2007 and 2014. Study characteristics were examined using chi-square and log binomial regression for hypothesis-specific testing.

Results

Of the 1429 cases, 872 (61.0 %) were boys and 557 (39.0 %) were girls. The racial distribution indicated 1146 (80.2 %) Whites, 170 (11.9 %) Blacks/African Americans, and 113 (7.9 %) others. The prevalence of CRS was 78.0 %. Whereas boys had sustained more concussions, girls were more likely to present with CRS; prevalence risk ratio = 1.07, 95 % CI 1.01–1.13, p = 0.02. The crude analysis indicated no racial disparities in CRS prevalence, but the multivariable analysis did, comparing White to Black/African American children; adjusted prevalence risk ratio (aPRR) = 1.77, 99 % CI 1.02–3.08, p = 0.008.

Conclusions

Racial disparities exist in CRS among children with sports-related concussion, and Black/African American children are more likely, relative to Whites, to suffer CRS. Due to uncertainty in causal inference, we caution the interpretation and application of these data in risk-adapted concussion prevention.

Racial and Ethnic Heterogeneity in the Association Between Total Cholesterol and Pediatric Obesity

Total cholesterol (TC) directly correlates with overweight/obesity, but it remains unclear if this association varies by race and ethnicity. We assessed the association as well as the racial/ethnic heterogeneity in this relationship. Data on 63,863 children were assessed using electronic medical records between 2010 and 2011. A cross-sectional design was utilized with log-binomial regression model and chi-squared statistic to examine the data. Overall, abnormal total cholesterol (ATC) was 7.5% (4812). Significant racial variability in ATC was observed: Black/African American (AA) (7.4%), White (7.0%), Asian (5.1%) and some other race (SOR) children (11.3%), χ² (5) = 141.5, p < 0.0001. Black/AA (34.7%) and SOR children (41.2%) were predominantly overweight/obese, unlike the Asian children, (25.8%), χ² (5) = 324.6, p < 0.0001. The BMI percentile was highest among SOR (69.0 ± 28.6) and Black/AA children (65.2 ± 29.1), but lowest among Asian children (55.7 ± 31.5). A significant racial variability was also observed in weight, with the highest mean among Black/AA children (36.8kg ± 23.0) and the lowest among Asian children (28.7kg ± 16.8), f = 7.2, p < 0.001. Relative to normal TC, children with ATC were 2.6 times as likely to have abnormal BMI, relative risk (RR) =2.60, 99% CI, 2.54-2.68). Compared to non-Hispanic (RR = 2.62, 99% CI, 2.54-2.69), the risk was lower among Hispanics (RR = 2.34, 99%, 2.21-2.48). Among children with ATC, risk for abnormal BMI was highest among Asians, adjusted RR = 2.91, 99% CI, 2.34-3.62), intermediate among AA (ARR = 2.68, 99% CI, 2.59-2.77), but lowest among Whites (ARR = 2.40, 99% CI, 2.39-2.64), and SOR (ARR = 2.33, 99% CI, 2.19-2.50). In a large sample of children, total cholesterol directly correlates with BMI, with an observed racial and ethnic heterogeneity.

Cultural Competence in Pediatrics: Health Care Provider Knowledge, Awareness, and Skills

The purpose of this study was to assess the effects of a cultural competence training (CCT) program on pediatric health care providers' self-reported ability to provide culturally competent care to a diverse pediatric patient population. This quantitative, nested ecologic level study design used a repeated measure in the form of pre-test and post-test data to assess percent change in providers' cultural awareness, experience working or learning about different cultures, and preparedness and skills in working with different cultures before and after CCT. The study was conducted between 2011 and 2012 in a pediatric hospital and associated outpatient offices. The sample consisted of pediatric health care providers from various departments, mainly physicians and nurses (n = 69). Participants completed a pre-intervention cultural competence assessment and then were subjected to a cultural competence-training program, after which they completed the assessment a second time. The baseline and post-intervention data were collected in the form of Likert scales and transformed into a quintile or quartile scale as appropriate. Data were assessed using paired t-tests or Wilcoxon's signed-rank tests. Providers indicated a 13% increase in knowledge (53.9% vs. 66.7%, t = 3.4, p = 0.001), 8.7% increase in awareness (46.7% vs. 55.4%, t = 3.0, p = 0.002), and 8% statistically marginal increase in skills (66.4% vs. 74.5%, z = 1.8, p = 0.06). Culturally competent training in a pediatric environment significantly enhances knowledge, awareness and to some extent skills in providing care to culturally diverse patient population.

Racial/Ethnic Variability in Hypertension Prevalence and Risk Factors in National Health Interview Survey

Objective. Hypertension is one of the leading causes of death attributed to cardiovascular diseases, and the prevalence varies across racial/ethnic groups, with African Americans being disproportionately affected. The underlying causes of these disparities are not fully understood despite volume of literature in this perspective. We aimed in this current study to examine ethnic/racial disparities in hypertension utilizing Hispanics as the base racial/ethnic group for comparison. Research Design and Methods. We utilized the National Health Interview Survey (NHIS), which is a large cross-sectional survey of the United States non-institutionalized residents to investigate the racial/ethnic disparities in hypertension after the adjustment of other socio-economic, demographic, and prognostic risk factors. The study participants were adults (n = 30,852). Data were analyzed using Chi square statistic, and logistic regression model. Results. There were statistically significant differences by race/ethnicity with respect to income, education, marital status, smoking, alcohol, physical activities, body mass index, and age, P < 0.01, but not insurance coverage, P > 0.01. Hispanic ethnicity (18.9%) compared to either non-Hispanic white (27.7%) or non-Hispanic black (35.5%) was associated with the lowest prevalence of hypertension. Race/ethnicity was a single independent predictor of hypertension, with non-Hispanic black more likely to be hypertensive compare with Hispanic, prevalence odds ratio (POR), 2.38, 99% Confidence Interval (CI), 2.17–2.61 and non-Hispanic white, POR, 1.64, 99% CI, 1.52–1.77. After controlling for the confounding variables, the racial/ethnic differences in hypertension persisted. Conclusions. Racial/ethnic disparities in hypertension persisted after controlling for potential predictors of hypertension in NHIS, implying the inability of known hypertension risk factors to account for racial/ethnic variability in hypertension in US.

Impact of Comorbidities on Racial/Ethnic Disparities in Hypertension in the United States

Background. Racial/ethnic disparities in hypertension (HTN) prevalence continue to persist in United States. We aimed in this study to examine the racial/ethnic disparities in hypertension prevalence and to determine whether or not health disparities may be explained by racial/ethnic disparities in co-morbidities. Materials and Methods. A cross-sectional design was used to examine the prevalence of hypertension among African Americans (AAs), Caucasians, and Hispanics in the National Health Interview Survey, 2003. The overall sample comprised 30, 852 adults. Results. There was a statistically significant racial/ethnic variability in hypertension prevalence, with AA/Blacks with the highest prevalence, χ2=393.0 (3), P<0.01. Hypertension was associated with co-morbidities, age, education, physical inactivity, marital status, income, sex, alcohol, and cigarette consumption, but not insurance. Relative to Caucasians, AAA/Blacks were 43% more likely while Hispanics were 40% less likely to report being diagnosed with high blood pressure, prevalence odds ratio (POR)  =  1.43, 99% CI, 1.25–1.64, P=0.002, and POR  =  0.60, 99% CI, 0.55–0.66, P<0.001, respectively. After adjustment for the relevant covariates including co-morbidities, racial/ethnic disparities in hypertension persisted; thus compared to Caucasians, African Americans were 61% more likely to be told by their health care providers that they were hypertensive, adjusted prevalence odds ratio (APOR)  =  1.61, 99% CI, 1.39–1.86, P<0.001. In contrast, Hispanics were 27% less likely to be diagnosed with hypertension compared to Caucasians, APOR  =  0.73, 99% CI, 0.68–0.79, P<0.001. Conclusions. There was racial/ethnic variability in hypertension prevalence in this large sample of non-institutionalized US residents, with the highest prevalence of hypertension observed among African Americans. These disparities were not removed after controlling for relevant covariates including co-morbidities.

Reducing bias in the assessment of treatment effectiveness: androgen deprivation therapy for prostate cancer

BACKGROUND

Indication bias is the major challenge in assessing treatment effectiveness in observational studies. We explored the potential advantages of using an instrumental variable approach in the context of primary androgen deprivation therapy (ADT) for prostate cancer.

METHODS

We identified 31,930 men in the linked Surveillance, Epidemiology, and End Results-Medicare database with a diagnosis of prostate cancer who were not treated definitively with radical prostatectomy or radiation in the years 1992 through 2002, with follow-up through 2005. The association between use of primary ADT and overall, prostate cancer-specific, and nonprostate cancer survival was assessed using multivariable regression and instrumental variable methods. Two instrumental variables, based on region and urologist prescribing preference, were constructed and analyzed using exogenous probit models. Prespecified subgroup analyses in patients with lower-risk and higher-risk prostate tumors were also carried out.

RESULTS

In the overall cohort, standard multivariable regression analyses showed a significantly increased risk of prostate cancer-related death, whereas the instrumental variable approaches showed a protective effect of primary ADT, which was significant for the urologist preference instrument (hazard ratio: 0.74; 95% confidence interval, 0.60-0.93). In the high-risk subgroup, using urologist preference for primary ADT as the instrument, there was a significant reduction in overall mortality (hazard ratio: 0.75; 95% confidence interval, 0.57-0.99), driven by a large reduction in prostate cancer-specific mortality.

CONCLUSIONS

Instrumental variable analysis appears to provide better control of bias when assessing the effectiveness of primary ADT for prostate cancer, although the results may be more applicable to policy rather than to clinical decisions.

Sex variability in pediatric leukemia survival: large cohort evidence

Purpose. Sex disparities in pediatric leukemia have been previously reported, and male children continue to present with poorer survival. However, the observed disparities are not fully understood. This current study sought to examine disparities in survival by the sex, and to determine if tumor prognostic factors impact on these disparities. Patients and Methods. We used the Surveillance Epidemiology and End Results dataset of pediatric leukemia patients (ages 0–19 years) diagnosed in the United States from 1973 to 2006. There were 15,215 patients of whom 8,622 (65.7%) were boys and 6,593 (43.3%) were girls. The Kaplan-Meier survival estimates, log rank test, and Cox proportional hazard methods were used to assess the data. Results. The overall (both sexes) five-year survival rate was 67.9%. Girls had a survival rate of 70.1%, while the rate was 66.3% in boys. Girls had a significant 14% decreased risk of dying relative to boys, hazard ratio (HR) = 0.86, 99% CI = 0.80–0.93. There were significant differences between boys and girls with respect to tumor cell type, race, age at diagnosis, year of diagnosis, and number of primaries, P < 0.001. After controlling for these factors, the sex differences in survival persisted, with girls still less likely to die from leukemia compared to boys, adjusted HR (AHR) = 0.85, 99% CI = 0.72–1.00, P < 0.01. Conclusion. In a large population-based pediatric leukemia study, boys continued to show poorer survival. These disparities were not completely explained by treatment received, tumor prognostic or socio-demographic factors.

Operative and clinical markers of deep wound infection after spine fusion in children with cerebral palsy

BACKGROUND

Infection after spine fusion for neuromuscular scoliosis has been shown to range from 4.2% to 20.0% prevalence. Although there are studies, which have examined deep wound infection and spine fusion surgery as well as risk factors for deep wound infection, there are limited studies evaluating clinical and radiographic factors associated with this complication. We aimed to determine the clinical and operative factors associated with deep wound infection after spine fusion in pediatric patients with cerebral palsy (CP).

METHODS

Medical records of 236 pediatric patients, aged between 5.6 and 21 years (mean=13.8 ± 3.4), with CP who underwent spine fusion from 1995 to 2006 were reviewed. Of these, 22 patients had deep wound infection. To assess the differences in clinical, radiographic, and other predisposing factors, we used χ statistic and Fisher exact, and to determine the predisposing factors of deep wound infection, we used binomial regression model.

RESULTS

The period prevalence of deep wound infection was 9.3%. In the unadjusted model, body weight, residual postoperative Cobb angle, length of hospitalization, packed red blood cells, and skin breakdown were the factors significantly associated with deep wound infection (P<0.05). After controlling for confounding, skin breakdown due to the instrumentation and residual postoperative Cobb angle were the 2 most potent markers of deep wound infection. There was a significant 4% increased risk of deep wound infection for 1-degree increase in the residual Cobb angle from the noncase mean residual Cobb angle of 23.69 degrees (adjusted risk ratio=1.04; 95% confidence interval, 1.01-1.08). Likewise, compared with those without skin breakdown, those with skin breakdown were 12 times as likely to develop deep wound infection (risk ratio=12.92; 95% confidence interval, 1.00-172.00).

CONCLUSIONS

Residual postoperative Cobb angle and skin breakdown due to unit rod instrumentation were the 2 most significant predisposing factors to deep wound infection. Other factors included body weight, packed red blood cells, and length of hospitalization. As the overall prevalence of deep wound infection is relatively high in CP patients after spine fusion, and considering the cost of hospitalization and other related comorbidities, surgeons should recognize these predisposing parameters to prevent deep wound infection in CP patients while correcting curve deformities.

LEVEL OF EVIDENCE

Level III retrospective study.

Epidemiologic mapping of Florida childhood cancer clusters

BACKGROUND

Childhood cancer remains the leading cause of disease-related mortality for children. Whereas, improvement in care has dramatically increased survival, the risk factors remain to be fully understood. The increasing incidence of childhood cancer in Florida may be associated with possible cancer clusters. We aimed, in this study, to identify and confirm possible childhood cancer clusters and their subtypes in the state of Florida.

METHODS

We conducted purely spatial and space-time analyzes to assess any evidence of childhood malignancy clusters in the state of Florida using SaTScan. Data from the Florida Association of Pediatric Tumor Programs (FAPTP) for the period 2000-2007 were used in this analysis.

RESULTS

In the purely spatial analysis, the relative risks (RR) of overall childhood cancer persisted after controlling for confounding factors in south Florida (SF) (RR = 1.36, P = 0.001) and northeastern Florida (NEF) (RR = 1.30, P = 0.01). Likewise, in the space-time analysis, there was a statistically significant increase in cancer rates in SF (RR = 1.52, P = 0.001) between 2006 and 2007. The purely spatial analysis of the cancer subtypes indicated a statistically significant increase in the rate of leukemia and brain/CNS cancers in both SF and NEF, P < 0.05. The space-time analysis indicated a statistically significant sizable increase in brain/CNS tumors (RR = 2.25, P = 0.02) for 2006-2007.

CONCLUSIONS

There is evidence of spatial and space-time childhood cancer clustering in SF and NEF. This evidence is suggestive of the presence of possible predisposing factors in these cluster regions. Therefore, further study is needed to investigate these potential risk factors.

Changes in neuronal activation patterns in response to androgen deprivation therapy: a pilot study

BACKGROUND

A common treatment option for men with prostate cancer is androgen deprivation therapy (ADT). However, men undergoing ADT may experience physical side effects, changes in quality of life and sometimes psychiatric and cognitive side effects.

METHODS

In this study, hormone naïve patients without evidence of metastases with a rising PSA were treated with nine months of ADT. Functional magnetic resonance imaging (fMRI) of the brain during three visuospatial tasks was performed at baseline prior to treatment and after nine months of ADT in five subjects. Seven healthy control patients, underwent neuroimaging at the same time intervals.

RESULTS

ADT patients showed reduced, task-related BOLD-fMRI activation during treatment that was not observed in control subjects. Reduction in activation in right parietal-occipital regions from baseline was observed during recall of the spatial location of objects and mental rotation.

CONCLUSIONS

Findings, while preliminary, suggest that ADT reduces task-related neural activation in brain regions that are involved in mental rotation and accurate recall of spatial information.

Review of major adverse effects of androgen-deprivation therapy in men with prostate cancer

Androgen-deprivation therapy (ADT) is a common treatment for men with prostate cancer. Although ADT is effective at suppressing prostate-specific antigen (PSA), stabilizing disease, alleviating symptoms in advanced disease, and potentially prolonging survival, it is not without serious side effects. However, to the authors' knowledge, there is lack of a systematic review of its major adverse effects to date. The authors of this report systematically reviewed and quantitatively assessed the literature on skeletal and cardiac side effects associated with ADT in men with prostate cancer. The PubMed database was searched for relevant published articles from 1966 to May 2008, and 683 articles were reviewed systematically from an original 20 different Medical Subject Heading search combinations. The focus of the review was on bone-related and cardiovascular-related outcomes. When appropriate, results were pooled from articles on specific adverse outcomes, summary risk estimates were calculated, and tests of heterogeneity were performed. Fourteen articles were identified that met inclusion criteria from the original 683 studies. Men who underwent ADT for prostate cancer had a significantly increased risk of overall fracture of 23% (summary relative risk, 1.23; 95% confidence interval [95% CI], 1.10-1.38) compared with men who had prostate cancer but who did not undergo ADT. Furthermore, men who underwent ADT had a 17% increase in cardiovascular-related mortality compared with men who did not undergo with ADT (summary hazards ratio, 1.17; 95% CI, 1.07-1.29). Significant elevations in the risk of diabetes also were observed from 2 large studies. ADT was associated with an increased risk of skeletal fracture, incident diabetes, and cardiovascular-related mortality, although the absolute risk of these events was low. Preventive measures against these adverse effects and careful assessment of patient's baseline health status should be considered.

Cognitive and mood changes in men undergoing intermittent combined androgen blockade for non-metastatic prostate cancer

PURPOSE

Men with prostate-specific antigen (PSA)-only relapse of prostate cancer after primary therapy are generally fully functional and asymptomatic with a life expectancy of up to 10 or more years. Androgen deprivation therapy (ADT) is a common treatment option. This study examined mood and cognitive changes in otherwise healthy men with prostate cancer prior to, during and after ADT.

EXPERIMENTAL DESIGN

Twenty hormone naïve, eugonadal prostate cancer patients without evidence of metastases and with a rising PSA were treated with intermittent ADT consisting of 9 months of complete androgen blockade (CAB) achieved with combined leuprolide and flutamide followed by an 'off treatment' period. Cognitive function tests and mood measures were administered at baseline, after 3 and 9 months of ADT and after 3 months of no treatment. Twenty healthy control patients without prostate cancer range matched for age and education were tested at the same time intervals.

RESULTS

ADT patients evidenced a significant decline in spatial reasoning, spatial abilities and working memory during treatment compared with baseline. No changes were noted for measures of verbal or spatial memory, selective attention or language. Significant changes in self-rated mood such as increased depression, tension, anxiety, fatigue and irritability were evident during treatment compared with baseline for ADT patients. No significant changes in either cognitive tests or mood measures were noted for the healthy control group.

CONCLUSIONS

These findings, suggest that 9 months of combined androgen blockade may result in some adverse changes in cognition and mood. However, many but not all of these changes can return to baseline after cessation of ADT.

Prevalence and risk factors in postoperative pancreatitis after spine fusion in patients with cerebral palsy

BACKGROUND

Postoperative pancreatitis is a recognized complication after spine fusion surgery in scoliosis management. There are established risk factors for the development of postoperative pancreatitis for patients with scoliosis in general, but no such factors have been established in patients with cerebral palsy (CP) who have scoliosis. The aim of this study was to assess the association between preoperative comorbidities and other parameters in the development of pancreatitis after spinal fusion surgery in a sample of children with CP.

METHODS

A retrospective cohort design was used to assess the association between postoperative pancreatitis and preoperative comorbidities and other covariates that might predispose to pancreatitis. The study participants included 355 patients, with a mean age of 13.8 years (range, 5.6-21 years) with CP, who received spine fusion with rod instrumentation. We used the chi statistic, mean, and SD to describe study variables that were categorical and continuous, respectively. To test the null hypothesis of no association between our outcome variable (postoperative pancreatitis) and comorbidities and other covariates as predictors, we used a binomial regression model. To simultaneously adjust for confounding effects in the relationship between our outcome and the independent or predictor variables, we used a multivariable binomial regression model.

RESULTS

Of the 355 patients who underwent spine fusion, 109 developed postoperative pancreatitis (prevalence, 30.1%). Patients who developed pancreatitis had prolonged number of fasting days (until oral or G-tube feeding initiated; 7.9 vs 5.2 days) and longer hospital stay (23.1 vs 15.6 days). In the univariable binomial regression model, patients with CP who had gastroesophageal reflux disease (GERD) and feeding difficulty were more likely to develop pancreatitis than those without this condition (risk ratio [RR], 1.57; 95% confidence interval [CI], 1.10-2.28, respectively). Likewise, in this model, gastrointestinal tube and reactive airway disease (RAD) were statistically significantly associated with postoperative pancreatitis. Patients with CP who had gastrointestinal tube were 61% more likely to develop postoperative pancreatitis, whereas those with RAD were 54% (RR, 1.61; 95% CI, 1.01-2.55 and RR, 1.54; 95% CI, 1.13-2.10, respectively). However, there was a clinically relevant but nonstatistically significant association between seizure and postoperative pancreatitis (RR, 1.72; 95% CI, 0.96-3.06). After adjustment for the confounding variables in the multivariable model, GERD with feeding difficulties persisted as a single most significant and potent predictor of postoperative pancreatitis (adjusted RR, 1.52; 95% CI, 1.01-2.29). Consequently, patients with CP who had GERD were 52% more likely to develop postoperative pancreatitis. Likewise, there was a statistically significant 49% increase in the risk of postoperative pancreatitis in patients with CP who had RAD (adjusted RR, 1.49; 95% CI, 1.10-2.04).

CONCLUSIONS

Pancreatitis is a major cause of morbidity after spinal fusion surgery in patients with CP. Patients with preoperative GERD with feeding difficulties and RAD had a higher risk of developing postoperative pancreatitis. Postoperative pancreatitis causes delays in feeding and increases the duration of hospitalization. Clinicians should be aware of the roles of GERD and RAD, as well as seizure and/or antiepileptics in the development of postoperative pancreatitis in patients with CP undergoing spinal fusion.

LEVEL OF EVIDENCE

Level III.

Survival outcomes in men receiving androgen-deprivation therapy as primary or salvage treatment for localized or advanced prostate cancer: 20-year single-centre experience

OBJECTIVES

To evaluate the overall survival (OS) and disease-specific survival (DSS) in men receiving primary androgen-deprivation therapy (PADT) or salvage medical ADT (SADT) for prostate cancer.

PATIENTS AND METHODS

After Institutional Review Board approval, we retrospectively reviewed patients receiving ADT for prostate cancer between July 1987 and June 2007. Variables included age at diagnosis and ADT induction, race, PSA level before ADT, ADT schedule (continuous/intermittent), clinical/pathological stage, hormone-refractory prostate cancer (HRCP) status, PADT or SADT, and deaths.

RESULTS

In all, 548 men were analysed. The mean age at diagnosis and ADT induction were 70.1 and 72.3 years, respectively, and 321 (58.6%) were African-American. The median PSA level before ADT was 16.3 ng/mL. ADT was administered continuously in 497 (90.7%) patients; 342 (62.4%) received PADT while 206 (37.6%) received SADT. At mean (range) follow-up of 81.8 (2.1-445) months, 98 (17.9%) deaths occurred; 31 (31.6%) were cancer-specific. The OS and DSS in the PADT and SADT groups were not significantly different (P = 0.36 and P = 0.81, respectively). Mortality rates/distributions were similar between groups (P = 0.68). Multivariate predictors of OS and DSS included age at diagnosis (P = 0.03) and ADT induction (P = 0.009), tumour stage (P < 0.001), and PSA level at ADT induction (P = 0.01). Progression to HRPC worsened OS and DSS (both P < 0.001).

CONCLUSION

PADT and SADT prolong survival in men with prostate cancer. HRPC portends a poor DSS. Age at diagnosis and ADT induction, PSA level before ADT, and disease stage predict both OS and DSS in this population. However, most men died from causes unrelated to prostate cancer, thus questioning the true value of ADT in prolonging patient survival.

Impact of androgen deprivation therapy on racial/ethnic disparities in the survival of older men treated for locoregional prostate cancer

BACKGROUND

Racial disparities persist in prostate cancer (CaP) treatment and survival, but disparities in androgen deprivation therapy (ADT) and the degree to which it affects racial differences in survival remains to be fully assessed.

METHODS

Using the Surveillance, Epidemiology and End Results-Medicare linked data, we examined a large cohort of men (N = 64,475) diagnosed with locoregional CaP during 1992 to 1999 and followed through 2003. The effects of ADT and race on survival were analyzed using a Cox proportional hazards model.

RESULTS

The receipt of ADT was significantly lower in African Americans (24%) relative to Caucasians (27%), Asians (34%), and Hispanics (28.7%) (P < .05). Compared with Caucasian race, African American race was associated with a statistically significant increased mortality (HR = 1.26, 95% CI = 1.21-1.32), which remained significant after adjusting for ADT but was substantially decreased after controlling for primary therapies such as radical prostatectomy, radiation, and watchful waiting (HR = 1.06, 95% CI = 1.01-1.10) and was no longer statistically significant after controlling for comorbidities (HR = 0.98, 95% CI = 0.94-1.03).

CONCLUSIONS

There were marked racial variations in the receipt of ADT, primary therapies (namely surgery and surgery combined with radiation), and comorbidities. However, racial disparities in survival were not affected by racial variations in ADT but were explained by racial variations in primary therapies and by racial differences in comorbidities.

Is dental care utilization associated with oral cavity cancer in a large sample of community-based United States residents?

OBJECTIVES

Cancer of the oral cavity and pharynx remains one of the 10 leading causes of cancer deaths in US. Besides smoking and alcohol consumption, there are no well-established risk factors. While poor dental care had been implicated, it is unknown if lack of dental care, implying poor dental hygiene predisposes to oral cavity cancer. This study aimed to assess the relationship between dental care utilization during the past 12 months and the prevalence of oral cavity cancer.

METHODS

A cross-sectional design of the National Health Interview Survey of Adult, noninstitutionalized US residents (n=30 475) was used to assess the association between dental care utilization and self-reported diagnosis of oral cavity cancer. Chi-square statistic was used to examine the crude association between the explanatory variable, dental care utilization and other covariates, while unconditional logistic regression was used to assess the relationship between oral cavity cancer and dental care utilization.

RESULTS

There were statistically significant differences between those who utilized dental care during the past 12 months and those who did not with respect to education, income, age, marital status, and gender (P<0.05), but not health insurance coverage (P=0.53). In addition, those who utilized dental care relative to those who did not were 65% less likely to present with oral cavity cancer, prevalence odds ratio (POR), 0.35, 95% confidence interval (CI), 0.12-0.98. Further, higher income, advanced age, people of African heritage, and unmarried status were statistically significantly associated with oral cavity cancer (P<0.05), but health insurance coverage, alcohol use, and smoking were not, P>0.05. After simultaneously controlling for the relevant covariates, the association between dental care and oral cavity cancer did persist but imprecise. Thus, when compared with those who did not use dental care, those who did were 62% less likely to be diagnosed with oral cavity cancer, adjusted POR, 0.38, 95% CI, and 0.13-1.10.

CONCLUSIONS

Among US adults residing in community settings, use of dental care during the past 12 months was marginally statistically significantly associated with oral cavity cancer, but clinically relevant in assessing oral cavity cancer prevalence in this sample. However, because of the nature of our data, which restricts temporal sequence, a large sample prospective study that may identify modifiable factors associated with oral cavity cancer development, namely poor dental care is needed.