JAMA : the journal of the American Medical Association
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Comparative Study
Genomic instability within tumor stroma and clinicopathological characteristics of sporadic primary invasive breast carcinoma.
That genomic alterations occur in both the epithelium and stroma of sporadic breast cancers has been documented by several groups. However, whether these microenvironmental alterations relate to clinicopathological features is unknown. ⋯ There were more correlations between clinicopathological features and the loss of heterozygosity/allelic imbalance in the stroma than in the epithelium, suggesting that stromal genomic alterations may help account for clinical diversity. Future research is necessary to validate these results and investigate their significance for prognosis and outcome.
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Public concerns about the perils associated with incomplete or delayed reporting of results from clinical trials has heightened interest in trial registries and results databases. Here we review the current status of trial registration efforts and the challenges in developing a comprehensive system of trial registration and reporting of results. ⋯ Recent policy initiatives have called for the development of a database of trial results. Several issues confound the implementation of such a database, including the lack of an accepted format or process for providing summaries of trial results to the public and concerns about disseminating data in the absence of independent scientific review.
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More than 50 million US adults take aspirin regularly for long-term prevention of cardiovascular disease, typically either 81 mg/d or 325 mg/d. Controversy remains regarding the most appropriate long-term daily dose. ⋯ Currently available clinical data do not support the routine, long-term use of aspirin dosages greater than 75 to 81 mg/d in the setting of cardiovascular disease prevention. Higher dosages, which may be commonly prescribed, do not better prevent events but are associated with increased risks of gastrointestinal bleeding.