I am a patient only,not a doctor.
Gemzar mono therapy is one of the treatment used in CCA patients, I was on for 14 months; anyway it may be a good idea to be off cisplatin for a while.
If you are worry about montherapy of Gemzar alone, you can ask your doctor whether to add Xeloda is a good choice. Express your concern to the doctors;showing them what is in your mind. Xeloda is taken by mouth twice a day,very convenient to the patient;of course there are side effects about Xeloda, but compare to cisplatin, it is much tolerable.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.