My husband has colon cancer. He had surgery and a gastric pouch was placed. He had chemotherapy a month later. He had a PET CT scan a month after chemotherapy. Many tumors grew in his stomach. He is now undergoing immunotherapy, but he often has numbness in his hands and feet, which affects his sleep. Does anyone know how to relieve the numbness in his hands and feet? Can immunotherapy kill cancer cells? Can it increase the survival rate? I'm scared. It would be great if the cancer could be transferred to me.