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University of Arizona Y chromosome cancer study

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2026-09-26 18:25 UTC → 2026-10-03 17:00 UTC · added ~~removed~~

Researchers at the University of Arizona Cancer Center have published findings in ‘JCI Insights’ regarding the link between mosaic loss of the Y chromosome (mLOY) and cancer risk in men. The study, led by Dr. Dan Theodorescu, involved the analysis of over 4.3 million cell nuclei from 1,000 tissue samples across 405 men. The research suggests that mLOY creates a ‘pre-neoplastic field effect,’ establishing zones of genetic vulnerability in tissues that appear normal under microscopic examination. This pattern of chromosome loss was observed across various organs, including the bladder, colon, rectum, esophagus, pancreas, lungs, and prostate. Subsequent details emphasize a spatial correlation, noting that Y-chromosome loss occurs more frequently in tissue located immediately adjacent to tumors. While the findings suggest mLOY could potentially serve as a biomarker for early cancer detection, researchers stated that further determination is required to establish it as a reliable clinical screening method. Further analysis highlights that mLOY is a common genetic change in aging men; reports suggest up to 40 percent of men show identifiable loss in certain blood cells by age 70, increasing to 60 percent by age 90. To conduct their research, the team utilized fluorescent in situ hybridization to examine the presence of X and Y chromosomes within the cells, reinforcing the potential for mLOY to serve as an early warning sign for cancer risk.

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