Behavioral Outcomes of a Pragmatic Early Childhood Caries Management Trial

OBJECTIVES

To evaluate a preventative behavioral intervention for managing early childhood caries (ECC) in a cohort of high-risk children.

METHODS

This pragmatic trial of the MySmileBuddy Program (MSB) evaluated preventive behavioral outcomes in a 1-y community health worker-delivered intervention to prevent ECC progression. Pre-/postintervention surveys assessed parent-reported child engagement in therapeutic toothbrushing (i.e., adult-assisted brushing with fluoridated toothpaste twice daily) and caries-related dietary behaviors and barriers. Generalized linear model with identity link for continuous variables and logit link for dichotomous outcomes evaluated pre-/postintervention comparisons and generalized estimating equations accounted for within-participant correlation (α = 0.05).

RESULTS

Among 1,130 children with postintervention data, the average age was 3.97 y, 99% were Medicaid insured, and 88% were Hispanic. Most parents (95%) were mothers/grandmothers, married or in a committed partnership (75%), unemployed (62%), and with modest education (80% high school degree or less). The odds of reported therapeutic brushing nearly doubled (n = 864; odds ratio [OR] = 1.79, 95% confidence interval [CI] = 1.46, 2.20, P < 0.001); day and night bottle/sippy cup frequencies dropped 0.29 units (n = 871; 95% CI = -0.37, -0.33, P < 0.001) and 0.22 units (n = 1,130; 95% CI = -0.30, -0.15, P < 0.001); nighttime breastfeeding reduced 0.15 units (n = 870; 95% CI = -0.21, -0.10, P < 0.001); sharing utensils reduced 0.30 units (n = 572; 95% CI = -0.39, -0.21, P < 0.001); not using sugary foods to calm child improved 0.37 units (n = 664; 95% CI = 0.31, 0.44, P < 0.001); odds of eating meals and snacks at a table increased (n = 572; OR = 1.57, 95% CI = 1.28, 1.93, P < 0.001; n = 572; OR = 1.80, 95% CI = 1.50, 2.15, P < 0.001) respectively; and reducing barriers to behaviors improved 0.38 units for toothbrushing (n = 666; 95% CI = 0.31, 0.44, P < 0.001) and 0.33 units for diet (n = 668; 95% CI = 0.29, 0.38, P < 0.001).

CONCLUSION

Despite limitations inherent to pragmatic trials, significant behavioral changes suggest that MSB yielded an important salutary impact. Forthcoming mediation analyses will explore causal pathways. Findings support integration of MSB's behavior change program in caries management initiatives.

KNOWLEDGE TRANSFER STATEMENT

The results of this study can be used by clinicians, public health leaders, and researchers to inform the development and implementation of community-based, preventative behaviorally focused early childhood caries prevention programs. Study findings may enhance the understanding of the impact of behavioral interventions that engage parents of young children and could lead to more effective prevention for populations at high-risk of caries.

Navigating polycrisis: long-run socio-cultural factors shape response to changing climate

Climate variability and natural hazards like floods and earthquakes can act as environmental shocks or socioecological stressors leading to instability and suffering throughout human history. Yet, societies experience a wide range of outcomes when facing such challenges: some suffer from social unrest, civil violence or complete collapse; others prove more resilient and maintain key social functions. We currently lack a clear, generally agreed-upon conceptual framework and evidentiary base to explore what causes these divergent outcomes. Here, we discuss efforts to develop such a framework through the Crisis Database (CrisisDB) programme. We illustrate that the impact of environmental stressors is mediated through extant cultural, political and economic structures that evolve over extended timescales (decades to centuries). These structures can generate high resilience to major shocks, facilitate positive adaptation, or, alternatively, undermine collective action and lead to unrest, violence and even societal collapse. By exposing the ways that different societies have reacted to crises over their lifetime, this framework can help identify the factors and complex social-ecological interactions that either bolster or undermine resilience to contemporary climate shocks. This article is part of the theme issue 'Climate change adaptation needs a science of culture'.

The Use of Lisdexamfetamine to Treat ADHD in a Patient with Stimulant (Methamphetamine) Use Disorder

Introduction

The treatment of attention deficit hyperactivity disorder (ADHD) with stimulants among patients with stimulant use disorder carries concern for efficacy and exacerbation of addictive behaviors. Lisdexamfetamine is a unique stimulant used to treat ADHD with a lower abuse potential compared to other stimulants, as the medication is the only prodrug in its class. To our knowledge, there are no reports in the literature of the use of lisdexamfetamine to treat ADHD in patients with stimulant use disorder.

Methods

We present a 33-year-old male with a history of stimulant (methamphetamine) use disorder, who was found to have long-standing ADHD. The patient was treated with lisdexamfetamine 30 mg, which was increased and sustained at 40 mg.

Results

The patient reported significant improvement in focus, concentration, calmness, organization of thoughts, and less of a tendency to procrastinate. Additionally, he denied exacerbation of anxiety or sleep disturbances. He reported his cravings for stimulants were significantly decreased. After 2 months of treatment, he had moved out from his sober living facility, started a new job, and gained a promotion. He had no use of illicit substances, which was proven by routine urine drug screens.

Conclusion

Our patient's ADHD was successfully treated with lisdexamfetamine. Not only did the patient's ADHD symptoms improve, but his cravings for stimulants were relieved. ADHD is common among patients with stimulant use disorder. Patients with ADHD and stimulant use disorder should not necessarily forgo pharmacologic treatment with stimulants for concerns of abuse. Due to its unique pharmacokinetic profile, lisdexamfetamine is a feasible treatment for patients with ADHD and a history of stimulant use disorder.

Disentangling the evolutionary drivers of social complexity: A comprehensive test of hypotheses

During the Holocene, the scale and complexity of human societies increased markedly. Generations of scholars have proposed different theories explaining this expansion, which range from broadly functionalist explanations, focusing on the provision of public goods, to conflict theories, emphasizing the role of class struggle or warfare. To quantitatively test these theories, we develop a general dynamical model based on the theoretical framework of cultural macroevolution. Using this model and Seshat: Global History Databank, we test 17 potential predictor variables proxying mechanisms suggested by major theories of sociopolitical complexity (and >100,000 combinations of these predictors). The best-supported model indicates a strong causal role played by a combination of increasing agricultural productivity and invention/adoption of military technologies (most notably, iron weapons and cavalry in the first millennium BCE).

The direct and indirect effects of a global pandemic on US fishers and seafood workers

The United States' fishing and seafood industries experienced major shifts in consumer demand and social-distancing restrictions starting in March 2020, when the early stages of the COVID-19 pandemic were unfolding. However, the specific effects on fishers and seafood processors are less well known. Fishermen and seafood workers are potentially at risk during a pandemic given existing tight working quarters, seasonal work, and long hours. To address these concerns, and given a lack of data on the sector, we reviewed news articles, scientific articles, and white papers to assess the various effects of COVID-19 on US seafood workers. Here, we show that most COVID-19 cases among seafood workers occurred during summer 2020 and during the beginning of 2021. These cases were documented across coastal areas, with Alaska experiencing the largest number of cases and outbreaks. Seafood workers were about twice as likely to contract COVID-19 as workers in other parts of the overall US food system. We also documented a number of indirect effects of the pandemic. New social-distancing restrictions and policies limited crew size, resulting in longer hours and more physical taxation. Because of changes in demand and the closure of some processing plants because of COVID-19 outbreaks, economic consequences of the pandemic were a primary concern for fishers and seafood workers, and safety measures allowed for seafood price variation and losses throughout the pandemic. We also highlight a number of inequities in COVID-19 responses within the seafood sector, both along racial and gender lines. All of these conditions point to the diverse direct and indirect effects of the COVID-19 pandemic on fishers and seafood workers. We hope this work sets the foundation for future work on the seafood sector in relation to the COVID-19 pandemic, improving the overall workplace, and collecting systematic social and economic data on workers.

Rise of the war machines: Charting the evolution of military technologies from the Neolithic to the Industrial Revolution

What have been the causes and consequences of technological evolution in world history? In particular, what propels innovation and diffusion of military technologies, details of which are comparatively well preserved and which are often seen as drivers of broad socio-cultural processes? Here we analyze the evolution of key military technologies in a sample of pre-industrial societies world-wide covering almost 10,000 years of history using Seshat: Global History Databank. We empirically test previously speculative theories that proposed world population size, connectivity between geographical areas of innovation and adoption, and critical enabling technological advances, such as iron metallurgy and horse riding, as central drivers of military technological evolution. We find that all of these factors are strong predictors of change in military technology, whereas state-level factors such as polity population, territorial size, or governance sophistication play no major role. We discuss how our approach can be extended to explore technological change more generally, and how our results carry important ramifications for understanding major drivers of evolution of social complexity.

The Initiation of Long-Term Pharmacotherapy in Schizophrenia: Dosage and Side Effect Comparisons Between Oral and Depot Fluphenazine*

This report focuses on two comparisons between oral and depot fluphenazine specifically FPZ decanoate: 1) can equivalent dosages for the two drugs be established and do these equivalencies change over six months of treatment; 2) what are the side effects seen with the two drugs during the early weeks of administration.

Patients in the study receive either oral or depot FPZ as the active treatment but in order to preserve double blind conditions, they are also given the other treatment in placebo form. No dosage equivalence is established by the protocol, however, if dosage is adjusted, both forms must be changed and in the same direction. During the first weeks of treatment there is a linear relationship between the two dosage forms but a range of relatively low dosages of the oral compound (5-20 mg) is associated with a single dose (25 mg/q 3 weeks) of FPZ decanoate. At higher dosages of the oral drug the relationship is linear.

Side effects of some kind are noted in over 60 percent of patients in both treatment groups after four weeks of treatment, while symptoms of at least moderate severity occur in almost 40 percent. Only symptoms involving the extrapyramidal system and sleep disturbance are observed in more than 20 percent of the patients.

Benztropine was prescribed only if needed and was administered to 65 percent of patients. In general, those receiving benztropine had more side effects than those who did not. These differences reached significance for extrapyramidal symptoms and depression.

Based on these data, we conclude that at the dosages used in this study there are no side effect differences between these two forms of fluphenazine in the early weeks of administration. Dosage equivalence between the two drugs can be set within the range of 5- 60 mg/day oral and 12.5-100 mg/three weeks depot.

Synthesis of isobemisiose, neosartose, and fischerose: three α-1,6-linked trehalose-based oligosaccharides identified from Neosartorya fischeri

Three complex α-1,6-linked trehalose-based oligosaccharides with unique preservation properties, isobemisiose, neosartose, and fischerose, were recently identified from the extreme stress-tolerant ascospores of Neosartorya fischeri. Herein, we report the first concise, scalable, and iterative chemical synthesis of these oligosaccharides from a differentially protected thioglycoside donor and a selectively protected, asymmetric trehalose acceptor. This work constitutes an improved synthesis of isobemisiose, and is also the first reported synthesis of neosartose, a tetrasaccharide, and fischerose, a pentasaccharide, in good yield. Importantly, in-depth studies of biological function are enabled by this synthetic platform.

The first concise and scalable chemical synthesis of three complex α-1,6-linked trehalose-based oligosaccharides, isobemisiose, neosartose, and fischerose, are reported for the first time.

Abstract P5-17-01: Lobular breast cancer alliance - Advocates advancing research, screening, treatment and follow-up care for lobular breast disease

Introduction

Thirty patient advocates attended the First International Invasive Lobular Breast Cancer Symposium in 2016 at the University of Pittsburgh Cancer Center. The conference underscored that invasive lobular breast cancer (ILC) and other lobular pathologies are understudied. Specifically:

ILC is the sixth most prevalent cancer of women and the second most frequently diagnosed histological subtype of breast cancer impacting up to 34,000 patients a year in the US.

ILC is a molecularly distinct breast cancer with unique subtypes and variants with differences in presentation and behavior, including physical findings of thickening and a tendency to metastasize to unique locations.

While ILC is frequently associated with a good initial prognosis, recent analysis suggests that long-term outcomes of ILC may be worse than those stage-matched to ductal breast cancer.

Current imaging tools are less reliable for early detection of lobular disease and detection of distant recurrence.

Standard of care chemotherapy and endocrine therapies may have different effectiveness applied to ILC and IDC.

Challenges

Growing interest in ILC research requires improved methods to identify, communicate with and link patients with ILC to clinical trials and research. Advocates with advanced science training are needed as partners for research proposals and grant reviews.

Lobular breast cancer is under-represented in key meetings and literature. Encouraging opportunities to share ILC research as agenda topics and fostering collaborations between researchers, clinicians and advocates can accelerate progress and refine clinical practices for screening, treatment and follow-up.

Patients living with ILC lack a central on-line source of lobular breast cancer information and resources. This information gap is a barrier to help patients recognize signs of lobular breast cancer's unique presentation and metastatic behaviors.

Results

The Lobular Breast Cancer Alliance (LBCA) was formed by patient advocates who attended the First International ILC Symposium in response to advocate-identified opportunities to advance research, refine treatments and enhance patient education.

LBCA's mission is to bridge patients, clinicians and researchers to increase our knowledge of lobular breast disease and promote research that leads to advancements in prevention, diagnosis, treatment and patient follow-up care.

Conclusions

LBCA is driving an increased awareness of lobular breast cancer with specific goals:

Build a clinically accurate, patient centered website devoted to lobular breast cancer at www.LobularBreastCancer.org.

Elevate lobular research and foster opportunities for researcher, advocate and clinician collaborations at prominent conferences and meetings.

Identify barriers to conduct research on ILC and metastasis and link patients and advocates to ILC tumor research and clinical trials.

Initiate peer-to-peer clinician outreach strategy through targeted literature, meetings and education services to share information on ILC presentation, metastatic patterns and screening and treatment challenges of patients with ILC.

Build partnerships with existing breast cancer organizations to integrate ILC into existing information resources and work on common goals.

Citation Format: Petitti L, Axelrod J, Campbell-Kotler M, Frank E, Jaremek J, Levine J, McWilliams M, Migyanka F, Ryan N, Viggiano E, Metzger-Filho O, Oesterreich S, Pate L. Lobular breast cancer alliance - Advocates advancing research, screening, treatment and follow-up care for lobular breast disease [abstract]. In: Proceedings of the 2017 San Antonio Breast Cancer Symposium; 2017 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2018;78(4 Suppl):Abstract nr P5-17-01.

Biochars Reduce Mine Land Soil Bioavailable Metals

Biochar has been proposed as an amendment to remediate mine land soils; however, it could be advantageous and novel if feedstocks local to mine land sites were used for biochar production. Two different feedstocks (pine beetle-killed lodgepole pine [] and tamarisk [ spp.]), within close proximity to mine land-affected soils, were used to create biochars to determine if they have the potential to reduce metal bioavailability. Four different mine land soils, contaminated with various amounts of Cd, Cu, Pb, and Zn, received increasing amounts of biochar (0, 5, 10, and 15% by wt). Soil pH and metal bioavailability were determined, and the European Community Bureau of Reference (BCR) sequential extraction procedure was used to identify pools responsible for potential shifts in bioavailability. Increasing biochar application rates caused increases in soil pH (initial, 3.97; final, 7.49) and 55 to 100% (i.e., no longer detectable) decreases in metal bioavailability. The BCR procedure supported the association of Cd with carbonates, Cu and Zn with oxyhydroxides and carbonates, and Pb with oxyhydroxides; these phases were likely responsible for the reduction in heavy metal bioavailability. This study proved that both of these feedstocks local to abandoned mining operations could be used to create biochars and reduce heavy metal bioavailability in mine land soils.

Autophagy has a key role in the pathophysiology of schizophrenia

Autophagy is a process preserving the balance between synthesis, degradation and recycling of cellular components and is therefore essential for neuronal survival and function. Several key proteins govern the autophagy pathway including beclin1 and microtubule associated protein 1 light chain 3 (LC3). Here, we show a brain-specific reduction in beclin1 expression in postmortem hippocampus of schizophrenia patients, not detected in peripheral lymphocytes. This is in contrast with activity-dependent neuroprotective protein (ADNP) and ADNP2, which we have previously found to be deregulated in postmortem hippocampal samples from schizophrenia patients, but that now showed a significantly increased expression in lymphocytes from related patients, similar to increases in the anti-apoptotic, beclin1-interacting, Bcl2. The increase in ADNP was associated with the initial stages of the disease, possibly reflecting a compensatory effect. The increase in ADNP2 might be a consequence of neuroleptic treatment, as seen in rats subjected to clozapine treatment. ADNP haploinsufficiency in mice, which results in age-related neuronal death, cognitive and social dysfunction, exhibited reduced hippocampal beclin1 and increased Bcl2 expression (mimicking schizophrenia and normal human aging). At the protein level, ADNP co-immunoprecipitated with LC3B suggesting a direct association with the autophagy process and paving the path to novel targets for drug design.

BioAssay Research Database (BARD): chemical biology and probe-development enabled by structured metadata and result types

BARD, the BioAssay Research Database (https://bard.nih.gov/) is a public database and suite of tools developed to provide access to bioassay data produced by the NIH Molecular Libraries Program (MLP). Data from 631 MLP projects were migrated to a new structured vocabulary designed to capture bioassay data in a formalized manner, with particular emphasis placed on the description of assay protocols. New data can be submitted to BARD with a user-friendly set of tools that assist in the creation of appropriately formatted datasets and assay definitions. Data published through the BARD application program interface (API) can be accessed by researchers using web-based query tools or a desktop client. Third-party developers wishing to create new tools can use the API to produce stand-alone tools or new plug-ins that can be integrated into BARD. The entire BARD suite of tools therefore supports three classes of researcher: those who wish to publish data, those who wish to mine data for testable hypotheses, and those in the developer community who wish to build tools that leverage this carefully curated chemical biology resource.

Perforator flap breast reconstruction in thin patients

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Background: Perforator flap breast reconstruction has strong appeal for many women seeking breast reconstruction, but the procedure requires adequate donor site tissue to produce realistic breasts. Thin women requesting perforator flaps are often advised that they lack sufficient donor site tissue for autologous tissue breast reconstruction, and that implants are their only option. We have expanded the reconstructive options for thin women who seek an alternative to implants with innovative new techniques.

Methods: A retrospective review was done of 223 patients who underwent 293 consecutive perforator flap breast reconstructions from April 2007-May 2011. Preoperative imaging allowed visualization of the microvascular anatomy and subcutaneous tissue. Donor sites evaluated included the abdomen, medial thigh, buttocks, and back. Complications included flap loss, hematoma, seroma, takeback, and fat necrosis. No patients were turned away for perforator flap breast reconstruction due to insufficient donor site tissue.

Results: Out of 293 perforator flap breast reconstructions, 45 perforator flap breast reconstructions (15.4%) were reported in 26 thin women with a BMI < 23 (mean BMI 20.7, range BMI 18.2-22.7). Out of 45 perforator flap breast reconstructions in thin women, donor sites included 35 hemi-abdominal flaps (77.8%), 4 medial thigh flaps (8.9%), 7 buttock flaps (15.6%), and 2 back flaps (4.4%). Of the 35 hemi-abdominal flaps, 8 hemi-abdominal flaps were combined to create 4 stacked DIEP flaps (22.9%) while the remaining 27 hemi-abdominal flaps were regular DIEP flaps (77.1%). There was one seroma (2.2%) and one takeback for postoperative pain (2.2%); there were no flap losses.

Conclusions: Even in thin women, perforator flap breast reconstruction is a safe, reliable, and consistent technique for recreating new breasts. While implant-based breast reconstruction may be acceptable to many women, there is a growing subgroup of patients who prefer autologous tissue breast reconstruction. By challenging common conceptions about the amount of donor site tissue required, we have been able to expand reconstructive options in thin women by using perforator flaps to construct natural, aesthetic breasts.

Fertility preservation in children and adolescents with cancer

With excellent survival rates for individuals diagnosed with cancer during childhood or adolescence an awareness of quality of life, including fertility preservation is essential. Chemotherapeutic regimens that include alkylating agents and radiation treatments directed at the gonads or pituitary, including total body irradiation are particularly gonadotoxic. Assessment of potential for gonadotoxicity and appropriateness of fertility preservation techniques prior to the start of cancer directed therapies in every individual pediatric patient is crucial for limiting this late effect of therapy. Sperm banking for postpubertal males prior to the initiation of gonadotoxic therapy should be considered standard of care. Postpubertal females receiving highly gonadotoxic therapy that places them at risk of acute ovarian failure should consider embryo or oocyte cryopreservation prior to the initiation of therapy. Oocyte cryopreservation, as well as cryopreservation of gonadal tissue, whether ovarian or testicular, remain experimental and as such should be offered as part of a research protocol. Females who receive treatment that deplete their ovarian reserve should be evaluated for the development of premature menopause following their treatment. Embryo or oocyte cryopreservation post therapy may offer females at risk of premature menopause the opportunity to preserve their reproductive window. Further research clarifying gonadotoxicity of contemporary treatment regimens and improving interventions to preserve fertility are necessary to prevent infertility as a long term adverse effect of cancer treatment. The establishment of programs that streamline access to current fertility preservation techniques will assist in ensuring that all eligible patients can avail themselves of current options.

Lymph Node Transplantation in Breast Reconstruction Using Perforator Flaps

Introduction: For many women undergoing breast reconstruction, the negative impact of upper extremity lymphedema outweighs the benefits of breast reconstruction.Patients with lymphedema present a challenging problem, and typically is not addressed during the reconstruction process. Lymph node dissections have decreased secondary due to the advent of the sentinel node biopsy. However, 7% of patients undergoing sentinel lymph node biopsy develop lymphedema. Previous treatments options have not proved to be highly successful, and include lymphatic massage and lymphaovenous anastomosis. We introduce a combined treatment for breast reconstruction using deep inferior epigastric perforator flap (DIEP) along with lymph node transplantation for lymphedema.Methods: Beginning in 2007, 23 patients have undergone bilateral breast reconstruction using the DIEP along with simultaneous lymph node transplantation. Each patient had demonstrated upper extremity lymphedema by measurements and subjective findings. Of the 23 patients 18 had radiation therapy and five had sentinel node dissection. The lymph node flap was harvested surrounding the superficial circumflex vessels in conjunction with the DIEP. The combined DIEP and lymph nodes were anastomosed to the internal mammary artery. Preparation of the axilla included removal of scar tissue, and fixation of the lymph nodes into the axilla.Results: Each patient had an uncomplicated postoperative course. These patients started to experience resolutions of lymphedema as early as ten days after surgery and continued up to six months. Currently, 15 patients no longer need lymphatic massage nor wear compression garment. One patient had a recurrence of breast cancer. Each patient reported their arm circumference had improved and decreased morbidity associated with lymphedema.Conclusion: Lymph node transplantation is a relatively new and exciting option for the management of lymphedema. Women who undergo breast reconstruction using perforator flaps can have simultaneous lymph node transplantation with minimal morbidity. These patients experienced an overall 89% improvement of symptoms.

Citation Information: Cancer Res 2009;69(24 Suppl):Abstract nr 3112.

Global leukocyte DNA methylation is not altered in euthymic bipolar patients

BACKGROUND

Bipolar disorder is a complex disorder hypothesized to involve an interaction of multiple susceptibility genes and environmental factors. The environmental factors may be mediated via epigenetic mechanisms such as DNA methylation. Since a different extent of DNA methylation has recently been reported in lymphoblastoid cells derived from monozygotic twins discordant for bipolar disorder, we hypothesized that bipolar patients exhibit a different extent of leukocyte global DNA methylation compared with healthy controls.

METHODS

DNA was extracted from peripheral blood leukocytes of 49 euthymic bipolar patients and 27 matched healthy controls. Percent of global genome DNA methylation was measured using the cytosine-extension method. Plasma homocysteine levels were measured by HPLC.

RESULTS

Leukocyte global DNA methylation did not differ between bipolar patients [62.3%+/-18.0 (S.D)] and control subjects (63.9%+/-14.6), p=0.70. Bipolar patients' plasma homocysteine levels (11.5 microM+/-4.8) did not differ from those of healthy controls (11.4+/-2.9), p=0.92.

LIMITATIONS

The assay we used, based on restriction by methylation-sensitive/insensitive enzymes followed by a radioactive DNA polymerase reaction was approved to accurately measure global DNA methylation, but has technical limitations i.e. restriction enzymes do not cleave all potential methylation sites in the genome and restriction sites may be altered by mutations or polymorphisms.

CONCLUSIONS

The lack of difference in leukocyte global DNA methylation between euthymic bipolar patients and healthy controls does not rule out the possibility that altered methylation of specific promoter regions is involved in the etiology of the disorder.

The false premise in measuring body-support interface pressures for preventing serious pressure ulcers

Presently, commercial cushioning products for pressure ulcer prevention are being evaluated for their protective effect exclusively based on interfacial pressures between the cushion/mattress and the patient. However, interface pressures cannot predict elevated mechanical stresses in deep tissues adjacent to bony prominences. Such deep tissue stress concentrations are associated with local ischaemia and hypoxia, which over time result in deep tissue necrosis, particularly of muscle tissue. In order to demonstrate this phenomenon, a physical phantom of the mechanical interaction between the ischial tuberosities (IT) and gluteus muscles of the buttocks was built, incorporating geometric replica of the human IT and real (bovine) muscle tissue. Internal muscle stresses directly under the IT were five to 11-fold greater than stresses at more distal locations, and a Pearson correlation test showed that they could not have been predicted from the interface pressures in the phantom. Accordingly, though pressure ulcer prevention clinics which utilize routine sitting pressure measurements report effective outcomes, the present results highlight a problem in using body-support pressure measurements to predict the risk for pressure-related deep tissue injury.

Identification of cancer stem cells in dog glioblastoma

There is increasing evidence in some malignancies that the tumor clone is heterogeneous in regard to proliferation and differentiation. The cancer stem cell hypothesis implies that not all the cells in the tumor have the same capacity to proliferate and maintain the growth of the tumor. Only a relatively small fraction of cells in the tumor, termed cancer stem cells (CSCs), possess the ability to proliferate and self-renew extensively. In the past decade, several groups have reported the existence of a CSC population in different human brain tumors from both children and adults. We report here the identification of a CSC population from a Boxer dog with glioblastoma multiforme (GBM) that possesses a great capacity for proliferation, self-renewal, and differentiation. This cloned cell line is aneuploid, forms neurospheres in culture, possesses CSC markers, and reproduces the original dog GBM when inoculated into the nude mouse brain.