My mother suffered an ischemic stroke caused by a blood clot one year ago, which left her with paralysis on the left side of her body. In mid-November last year, she was diagnosed with stage IV nasopharyngeal cancer. Recently, her condition has declined—she has become increasingly drowsy, has a poor appetite, and is experiencing many distressing symptoms. My sister has suggested that our mother try immunotherapy, possibly starting with a low dose. However, I am deeply concerned about the...