My 96 year old father in law was diagnosed in January 2019 w/ muscle invasive bladder cancer and decided on no treatment. He subsequently agreed to radiation but only had 2 treatments. He had another cystoscopy 3 months ago that showed bladder cancer in situ. Another cysto was done this week and today biopsy results show muscle invasive bladder cancer. Surgery is not an option for his age and chemo would likely be fatal for him so his urologist is saying that he could possibly have immunotherapy. Any thoughts on this?