Immunotherapy Institute- Tijuana, MX- HELP!

Hey all, my father was diagnosed with prostate cancer and is considering the Immunotherapy Institute in Tijuana, MX. He had a long call with them and we are now digging in and trying to see if this is a viable alternative option for treating him. Has anyone recieved care there? Any experiences you can share with us? We are trying to avoid invasive action and chemical (chemo). He is an otherwise extremely healthy 68yo, physically fit and has a generally healthy diet. Any help and advise would be so appreciated. We are just looking for best action and next steps as the reviews are a mixed bag. Any first hand experiences here??? Thank you in advance.