hi I am so sorry to hear the news you face about your kitty, I can understand your dilemma and I am so glad you are doing research to try and come to an informed decision before jumping into any treatment. I would recommend more than one opinion. Perhaps an ultrasound if you are able to afford this, at least its not invasive as a biopsy would be for a starting point.
I wish I could be of more help, on this forum we are only cat owners as yourself who share info we have gained by our devotion to our cats... I'm afraid no one here would be qualified enough to give you the answers you seek....I will include a forum also here on Medhelp that is run by a holistic Veterinarian, perhaps she can give you some answers...I wish you and kitty our love and prayers and hope you'll return to tell us what route you have decided to peruse...we are always avail for a chat...
http://www.medhelp.org/forums/Animal-Health---General/show/112?camp=msc