hi, am having the same questions regarding this matter.
my fiance, aged 26, was diagnosed with colon cancer late this june, he underwent total colectomy with partial cystectomy because the tumor in his sigmoid are adhered to his bladder. nothing has spread to other organs but 4 out of 54 lymph nodes were positive and he is presently undergoing chemotherapy in singapore. prior to his chemo, his initial PET scan showed a small hot spot which was located in the area where his tumor has been.
at first he was given 5-FU, erbitux, and oxaliplatin. worried that we won't be able to have children in the future, we asked the oncologist if we need to have his sperm banked but assured us that there's nothing to worry about regarding that matter. after 3 rounds of chemo he proceeded with his PET scan and showed that his "hot spot" is a stubborn one and did not shrink (but didn't spread not got bigger). so the oncologist changed his chemo to avastin, 5-FU, and camptosar.
one thing that bothers us right now is that we were so much focused on the hot spot we forgot to ask if the chances for us to have kids would be the same not that my fiance's oncologist changed his treatment plan. am afraid that maybe it's too late to have his sperm banked for the future.