I'll 2nd with what the MO's opinion is? Which chemo or combination will work best in your mothers case, have least toxicities. I had all these chemos mentioned at one time or another, and they have similar, and their own toxicities. Fluorouracil, aka 5-FU, is not easy, as mentioned, so is taxol, but depends on dosage too, they all do, and cetuximab, aka Erbitux, is notorious for the rash. Carboplatin, was easiest, at least for me. This sounds like palliative care induction chemo with no surgery or radiation planned. Hopefully whatever cocktail is given will wipe this out, make the tumors smaller.