Preventive medicine
Preventive medicine researchers from Harvard University and Northwestern University conduct a study on long-term (13 years; 793 people) pre-cancer changes (mostly leukemia, prostate cancer, lung cancers, and skin cancers) in telomeres, the protective ends of DNA. Some said, in previous short-look studies, that focused mostly on their known role in the pace of regular aging, that they either got shorter or longer. There was a 3-4 year period of accelerated aging, and then it halted a few years before cancer was diagnosed.
Sources: Medical News Today