Pray, and pray a lot. Patience, and talk to people around you. The stress is on the family. The person it is happening to deals with it - step by step
My father died of cancer (melenomia ?) when I was 14, he had it for 2 years. At the time I didn't know much about it and didn't understand it. A few years ago, my sister found out she had Uterian/Ovarian cancer, stage 3. It had already started spreading from the uterious to the ovaries. She's okay now, 7 years this year.