LOS ANGELES – Most patients diagnosed with early stage prostate cancer will live just as long if they simply watch their cancers rather than have them surgically removed, according to the results of a landmark clinical trial that could upend the medical approach to a disease that affects 1 in 6 men. The study, which focused on cancers confined to the prostate, should reassure patients who want to avoid potential side effects of surgery – such as urinary incontinence and sexual dysfunction – but still protect their lives, cancer experts said. If embraced by patients and doctors, the new information stands to radically change prostate cancer management in the U.S., where the majority of early prostate cancers are treated aggressively with surgery or radiation therapy.