Actually, there is tremendous progress in the treatment of most cancers. Some are very difficult to treat. Pancreatic cancer and glioblastoma are two of the most difficult to treat, but great progress is being made in those areas.
Five years ago, the median survival time for glioblastoma was about six months. It may be up to two years now. Still pretty much a death sentence, but there is progress.
Pancreatic cancer, if not caught early, had a 1-2% 5-year survival rate five years ago, but early detection protocols is improving those statistics by quite a bit.
Metastatic (spread to the bones) prostate cancer, for which there is no current cure, is now a major focus of research. It affects the most number of men - including me- and great progress is being made. I plan on being around for the cure.
Immunotherapy and viral therapy research is currently a major focus in the treatment of many cancers.
I hope immunotherapy works for you and for the rest of humanity. With my family history, I'm on that list.