stage 4 tonsil cancer life expectancysquamous cell carcinoma tonsil stage 4gallbladder cancer stagescancer of the pancreas stage 4prostate cancer stage 4 treatmentstages of cancer diagnosisstage 4 cancer metastasislymphatic cancer stage 3immunotherapy for stage 4 cancerstage 4 peritoneal cancerstage 1 uterus cancer treatmentstage 4 lung cancer how long to live