By Dr. Priyom Bose, Ph.D. Reviewed by Lauren Hardaker Sep 15 2025 Scientists discovered that just one round of exercise can change blood chemistry in breast cancer survivors, releasing proteins that help suppress tumor cell growth in laboratory experiments and pointing to exercise as a powerful, non-drug therapy. Study: A single bout of resistance or high-intensity interval training increases anti-cancer myokines and suppresses cancer cell growth in vitro in survivors of breast cancer . Image