In June, I had a tumor removed from my large intestine which was NOT colon cancer, but DLBCL stage 2. Prior PET and CT showed no sign of metastasis. The NCCN "Guidlines" suggests RCHOP X3 followed by radiation. Since the tumor has been removed, my oncologist tells me radiation is not necessary. Glad for that. I have finished 3 cycles of RCHOP-21 this past week and am scheduled for follow up PET/CT scan next week. If the scans come back negative, per the guidelines, I consider the treatment done since I have no tumor and radiation is not necessary. But, my oncologist is urging me to have one more cycle of RCHOP. Isnt the removal of the tumor equal to, or better than radiation of the tumor? So, therefore, RCHOP x 3 + ISRT – ISRT = RCHOP x 3 cycles.