This study is for patients with bladder cancer. The study is being done to see if by using one type of chemotherapy instilled in the bladder, Gemcitabine and Docetaxel, instead of the usual BCG therapy can lower the chance of the patient's bladder cancer from growing or spreading.

This study is for patients with bladder cancer. The study is being done to see if by using one type of chemotherapy instilled in the bladder, Gemcitabine and Docetaxel, instead of the usual BCG therapy can lower the chance of the patient's bladder cancer from growing or spreading.

The study is for patients that have been diagnosed with carcinoma in situ of the bladder (localized bladder cancer, also called "non-muscle invasive bladder cancer") with or without Ta-T1 papillary disease (Ta means that the cancer is only in the innermost layer of the bladder lining, T1 means that the cancer has started to grow into the connective tissue beneath the bladder lining). The investigational drug used in this study is ONCOFID-P-B. The main purpose of this study is to understand if the study medicine ONCOFID-P-B is effective and safe in treating patients with carcinoma in situ of the bladder who have not received benefit from the standard BCG treatment and are not candidates for radical cystectomy. Participants can expect to be in this study for up to 4 years and will include a screening period of up to 4 weeks followed by up to 33 study visits to the study site.