Cancer chemo can be a taxing process on both you and the cat. Something to ask before deciding one way or another - what stage is the cancer? Lower stages are easier to treat. If it has metastasized (stage 4), it is less likely to go into remission.
Also, how old is your cat? How does your cat do with vet visits? Taking meds? Car trips? How expensive is the course of treatment? What is the prognosis for treatment - cure? slowing the progression? palliative (comfort care, not intended to cure)?
I had a kitty with lymphoma in the bone of her leg. We thought we found it early; we did not. The prognosis for a late stage lymphoma in the bone was 6 months; $2000 later, she passed at 9 months. Although they say cats and dogs don't get sick from chemo like people, she vomited and had diarrhea a few hours after every treatment, sometimes despite meds to control that.