First, let me tell you I am sorry for what you and your loved one are going through. I was diagnosed with Diffuse Large B Cell Lymphoma back in January and only given Rituxan which worked great. However, just about a month ago, my one tumor began to enlarge a little and the doctors decided to put me on the CHOP and Rituxan. My regular Oncologist that put me on the Rituxan got sick and I had to see one of his partners when the tumor started to grow. The new doctor could not believe I was not given CHOPS from the beginning. Now, I am on both CHOPS and Rituxan and hopefully this will do the job. I would ask his doctor about putting him on the CHOPS because it may be able to help him. the treatment is a little tough on me, but I am getting through it ok. The first two weeks after treatment, I experience a lot of nausea and some moderate to severe bone pain, but after the two weeks, I begin to feel normal again. Anyway, I hope this helps you and I would love to exchange information with you via the message board and help in anyway possible. By the way, I am only 37 and never thought it would happen to me. The best advice I can give to you is to give him all the support you can. That is so important to me and I think other cancer patients realize how important supporot is. God Bless and take care.