Genetic variation in the one-carbon transfer pathway and ovarian cancer risk

Dysfunction in enzymes involved in one-carbon (1-C) metabolism can lead to increased chromosomal strand breaking and abnormal methylation patterns, which are both associated with cancer risk. Availability of 1-C units may modify risk. We investigated the association of single-nucleotide polymorphisms (SNP) in 21 genes in the 1-C transfer pathway among 829 Caucasian cases with primary epithelial ovarian cancer and 941 frequency-matched unaffected controls enrolled at Mayo Clinic (Rochester, MN) and Duke University (Durham, NC) and examined risk modification by multivitamin supplement use. Multivariable-adjusted SNP-specific logistic regression and haplotype analyses were done for 180 SNPs and false positive report probabilities (FPRP) were calculated. Each copy of the minor allele in SHMT1 intron 5 A>G (rs9909104) was associated with epithelial ovarian cancer [odds ratio (OR), 1.2; 95% confidence interval (95% CI), 1.0-1.4; P trend = 0.02; FPRP = 0.16] and a 5-SNP SHMT1 haplotype was associated with decreased risk (P = 0.01; FPRP = 0.09). Three SNPs in DNMT3A were associated with risk among multivitamin supplement users: 3' untranslated region (UTR) C>G (rs13420827: OR, 0.8; 95% CI, 0.6-1.0; P interaction = 0.006; FPRP = 0.54), intron 6 G>A (rs11887120: OR, 0.8; 95% CI, 0.7-1.0; P interaction = 0.007; FPRP = 0.57), and intron 22 A>T (rs11695471: OR, 1.2; 95% CI, 1.0-1.5; P interaction = 0.01; FPRP = 0.66). These data extend previous findings from other cancers of a role for SHMT1 in ovarian cancer, and provide evidence that SNPs in methylation and DNA synthesis reactions are associated with risk of ovarian cancer. Interventions with modifiable factors such as multivitamin intake may reduce risk.     

Stress among Care Givers: The Impact of Nursing a Relative with Cancer

Aims:

The aim of the present study is to assess the level and areas of stress among care givers nursing their loved ones suffering from cancer.

Setting and Design:

An assessment of care givers’ stress providing care to cancer patients at Cipla Palliative Care Center was conducted. The study involves data collection using a questionnaire and subsequent analysis.

Materials and Methods:

A close-ended questionnaire that had seven sections on different aspects of caregivers’ stress was developed and administered to 137 participants and purpose of conducting the survey was explained to their understanding. Caregivers who were willing to participate were asked to read and/or explained the questions and requested to reply as per the scales given. Data was collected in the questionnaires and was quantitatively analyzed.

Results:

The study results showed that overall stress level among caregivers is 5.18 ± 0.26 (on a scale of 0-10); of the total, nearly 62% of caregivers were ready to ask for professional help from nurses, medical social workers and counselors to cope up with their stress.

Conclusion:

Stress among caregivers ultimately affects quality of care that is being provided to the patient. This is also because they are unprepared to provide care, have inadequate knowledge about care giving along with financial burden, physical and emotional stress. Thus interventions are needed to help caregivers to strengthen their confidence in giving care and come out with better quality of care.     

Chondrocyte viability in press-fit cryopreserved osteochondral allografts.

The viability of chondrocytes in press-fit glycerol-preserved osteochondral allografts was compared to that in fresh autografts, after transplantation into load-bearing and non-load-bearing sites in mature sheep stifle joints. We used macroscopic grading, tonometer pen indentation testing, histology, sulfate uptake and viability as determined by confocal-microscopy to assess cartilage condition. Despite there being no statistical differences between macroscopic appearance and tonometer testing of all grafts, confocal microscopy and histology demonstrated a positive effect of load-bearing placement on cryopreserved osteochondral allografts. Allografts transplanted into load-bearing sites demonstrated superior confocal microscopy-measured chondrocyte viability (77%+/-17%SD) than those transplanted into non-load-bearing sites (25%+/-2%). Load-bearing effect was not seen in autografts (78%+/-15%), and was comparable in adjacent cartilage (83%+/-9%). Similarly, load-bearing allografts demonstrated histological scoring closer to that of autografts and adjacent cartilage, all of which fared significantly better than non-load-bearing allografts. Load-bearing allografts had a greater amount of fibrocartilage than autografts or adjacent cartilage but less fibrocartilage than non-load-bearing allografts. Both autografts and allografts had non-significant increases in metabolism compared to adjacent cartilage as measured by sulfate-uptake. Load-bearing placement improved chondrocyte viability of glycerol cryopreserved osteochondral allograft following a press-fit implantation.     

Finding Sex Partners Through Social Media Among Men Who Have Sex with Men in Hanoi,Vietnam

Many men who have sex with men (MSM) in low and middle income countries search for male sexual partners via social media in part due to societal stigma and discrimination, yet little is known about the sexual risk profiles of MSM social media users. This cross-sectional study investigates the prevalence of social media use to find male sex partners in Hanoi, Vietnam and examines associations between social media use and sociodemographic and behavioral characteristics, including levels of internalized, perceived and enacted stigma, high-risk sexual behaviors, and HIV testing. 205 MSM were recruited from public venues where MSM congregate as well as through snowball sampling and completed an anonymous survey. MSM who found their male sexual partners using social media in the last year were more likely to have completed a university or higher degree (aOR 2.6; 95% CI 1.2–5.7), experience high levels of MSM-related perceived stigma (aOR 3.0; 95% CI 1.1–8.0), and have more than ten lifetime male sexual partners (aOR 3.2; 95% CI 1.3–7.6) compared to those who did not use social media. A niche for social media-based interventions integrating health and stigma-reduction strategies exists in HIV prevention programs for MSM.     

Epistatic interactions between thiopurine methyltransferase (TPMT) and inosine triphosphate pyrophosphatase (ITPA) variations determine 6-mercaptopurine toxicity in Indian children with acute lymphoblastic leukemia

Purpose  

To explore the role of genetic variants of thiopurine methyltransferase (TPMT) and inosine triphosphate pyrophosphatase (ITPA) in 6-mercaptopurine (6-MP)-induced toxicity in Indian children with acute lymphoblastic leukemia (ALL).     

Bioluminescence based in vivo screening technologies

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Highlights? Bioluminescence imaging, a cell-based tool for high-throughput screening. ? Luciferase biosensors to study gene expression and protein–protein interactions. ? Bioluminescent microscopy for imaging intracellular dynamics and heterogeneity. ? BLI screening, a single format assay for both mammalian cell and animal model.