My sister has cancer. She's undergone both chemo and radition, after much prayer, and the Lord revealing that those treatments were the path he wanted her to take. He has worked miracles in her life during that time. Her neck, damaged by a tumor, healed while she was undergoing chemo, even though doctors said that was impossible. A wound in her neck opened up from radiation burns, but it healed while she was still getting radiation, even though doctor's said she'd have to wait until the radiation was over. She is alive, solely because God has granted her life. She has witnessed to doctors, nurses and fellow patients, telling them of how great God is and what a wonderful Savior she has in Christ Jesus. She has met none-too-few people, doctors and nurses included, who agree that she is alive thanks to the grace of God, and not primarily due to medical intervention.
