Hi,
Any immune modulation may cause the colitis to flare in some patients. It is perhaps impossible to predict accurately if this will indeed be the case with you. It may turn out that you do not experience any worsening of colitis symptoms. In fact many persons with connective tissue disorders often improve transiently when on anti-cancer medications.
The benefits from BCG instillation in patients with bladder cancer are well documented. Please discuss your clinical situation with your oncologist as well as your gastroenterologist.
All the best, and God Bless!
Dr Saini,
Thank you for your quick response.