• Diagnosis of any type of genitourinary (kidney, bladder and prostate), melanoma, non-melanoma skin cancer, lung, head \& neck, sarcoma/lymphoma, gastrointestinal system (luminal GI, hepatobiliary, pancreas), gynecology system (ovarian, uterine, cervical), and breast malignancies

• Treatment with any ICPI agent(s)

• Participants with new onset of ≥ grade 2 ICPI-induced diarrhea and/or colitis symptoms based on the Common Terminology Criteria for Adverse Events (CTCAE) version 5 within 45 days prior to date of FMT treatment without involvement of non- GI toxicity

• Participants with a history of steroid use before FMT can be allowed if last dose was \> 30 days prior to FMT treatment or treatment duration was for \<7 days beyond one week prior to FMT treatment

• Participants with a history of immunosuppressant (Infliximab, Vedolizumab etc) use before FMT can be allowed if last dose was administered ≥ 3 months prior to FMT treatment when used for the treatment of conditions other than for ICI- induced GI toxicities (e.g., Infliximab is used in the treatment of Crohn's disease, rheumatoid arthritis, plaque psoriasis, and Vedolizumab is used in treating ulcerative colitis)

• No concern for active concomitant GI infection at the time of initiation of protocol therapy as confirmed by stool tests or as per the treating physician based on clinical presentation

• Participant has been cleared for enrollment by Infectious Diseases consultant or treating physician if positive infection workup or screening tests (e.g., lifelong positive T-spot due to BCG inoculation, chronic colonization) prior to initiation of protocol therapy

• Ability to understand and willingness to sign an informed consent form

• Life expectancy \> 6 months