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Genetic Link Found Between Stress-Induced Sleep Loss And Intrusive Thinking
The genetic factors that cause increased sleep problems during times of stress seem to be the same as those that make people with intrusive and ruminative thoughts have a higher prevalence of insomnia, according to a research abstract presented at SLEEP 2009, the 23rd Annual Meeting of the Associated Professional Sleep Societies.
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General Practices Need More Nurses, Australia
Boosting the number of practice nurses who work with GPs would help improve patient access to care, the AMA said today.
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Memory Test And PET Scans Detect Early Signs Of Alzheimer's
A large study of patients with mild cognitive impairment revealed that results from cognitive tests and brain scans can work as an early warning system for the subsequent development of Alzheimer"s disease.
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Promising Biomarker And Candidate Tumor Suppressor Gene Identified For Colorectal Cancer

Researchers have identified a new candidate tumor suppressor gene in colorectal cancer and examined its use as a potential biomarker in stool samples, according to a new study published online June 17 in the Journal of the National Cancer Institute. In the study, Manon van Engeland, Ph.D., of the Department of Pathology at Maastricht University Medical Center in the Netherlands, and colleagues examined N-Myc downstream-regulated gene 4 (NDRG4) as a novel tumor suppressor and biomarker. The researchers analyzed NDRG4 promoter methylation and expression in human colorectal cancer cell lines, noncancerous colon mucosa, and colorectal cancer tissue. Quantitative methylation-specific polymerase chain reaction was used to examine NDRG4 promoter methylation as a biomarker in fecal DNA from 75 colorectal cancer patients and 75 control subjects. The researchers found that NDRG4 promoter methylation was more prevalent in colorectal cancers than in noncancerous colon mucosa. Its mRNA and protein expression were decreased in colorectal cancer tissue compared with noncancerous colon mucosa. A methylation-specific polymerase chain reaction assay for NDRG4 promoter methylation in stool identified the presence of colorectal cancer in 53% of colorectal cancer cases and correctly categorized a subject as cancer free 100% of the time. "In conclusion, to our knowledge, this is the first study to describe a tumor suppressor role for NDRG4 in cancer," the authors write. "Our data indicate that NDRG4 promoter methylation is potentially useful as a sensitive and specific noninvasive pre-selection modality for identifying individuals at risk for colorectal cancer for whom colonoscopy is recommended." In an accompanying editorial, Gad Rennert, M.D., Ph.D., of the Carmel Medical Center and Technion in Haifa, Israel, discusses the concept of molecular testing of stool for early detection of colorectal cancer and where such testing stands today. "Genetic diagnosis of colorectal cancers and meaningful adenomas has now reached a new phase that, when further fine-tuned, may carry the promise of becoming a suitable and affordable means of prevention and early detection of colorectal cancer in the general population," he writes. Citations: Article: "N-Myc downstream-regulated gene 4 (NDRG4): a candidate tumor suppressor gene and potential biomarker for colorectal cancer." Melotte et al. J Natl Cancer Inst 2009, 101: 916-927. Editorial: "Are We Getting Closer to Molecular Population Screening for Colorectal Cancer?" Rennet G. J Natl Cancer Inst 2009, 101: 902-903. Journal of the National Cancer Institute


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