Grappling hook peg

What are the chances of my best friend's dad surviving this? - surviving chemo

He had a mild stroke and was diagnosed with stage 3 lung cancer. This is useless, but has returned home to prepare for chemotherapy at another time. He suffered a second stroke that has severely hampered, and the mentally and physically crippled. What are the chances of survival of the third phase, and the second devastating blow to their chances of survival of cancer is much thinner. I only ask that I speak with the doctor and see, my friend, but once a week. Thank you.