I understand your dilemma. My gums are the same way. I quit going to the dentist for a while, but have started back again. I quit chemo for about 5 weeks so I could go to the dentist. I, too, am on topetecan, but I don't care for it too much. It makes me sick (none of the others have), and my numbers are not coming down. My CA125 is currently 1895.8, the highest it has ever been. I've been on chemo for over 2 years now and will continue to be the rest of my life, but I do think that is better than going into remission and then it come back with a vengence. Good luck to you.
By the way, my oc was 3C.