Hi There,
It sounds like you have had excellent therapy and care. This must be so scary for you. The cancer that you are experiencing has a part of it that is sensitive to chemotherapy but there is a part of it that keep growing back.
In addition to Ifex, cis other choices include gemzar, topotecan, cisplatin alone, taxotere.
my inclination would be to suggest looking into what clinical trials are available at your institution or if your are outside of a major cancer center, I would suggest a second opinion. I only suggest that because there may be more options for you at a big center if you are not currently treated there.
If this cancer keeps growing, you are facing a very scary situation. You may become sick from this cancer quickly within the next year. It is important to be sure that you have a health-care proxy who knows your wishes. it is also important to talk with your doctor about what your wishes are - such as would you want to be intubated and resuscitated.
please let me know what you decide
take care