A large-scale epidemiological study, published in JAMA Internal Medicine showed that In addition to associations with lower risk of heart-disease and mortality, leisure-time physical activity is also associated with lower risks of 13 types of cancer, including esophogeal, lung, kidney, gastric, endometrial, myeloid leukemia, myeloma, colon, head and neck, rectal, bladder, and breast.
See here for a useful chart on the evidence for cancer-specific risk reductions from exercise.