['Hamas' Jenkins]

This is a semi-educated guess, but I don't believe the chemo should affect your ability to donate blood in reality (there probably isn't a real medical risk to the recipient, given your diagnosis), but I don't believe that you can donate blood while being actively treated, and there are additional restrictions depending on the type of malignancy (for example, you have to be clear much longer if you had leukemia).

The chemo you are on wouldn't affect your blood, but you don't want to donate because I'd bet you're likely to become anemic, as all of your fastest-growing cells are having a methyl group stuck on one of the four DNA bases, which effectively stops them in their tracks, meaning that your marrow is likely to take a pounding (along with the cancer, and, sadly, your balls).