Samir "Sam" Chachoua is an Australian alternative medicine practitioner, trained as a medical doctor. He is not actively licensed to practice medicine in Australia or the United States. Chachoua offers treatments in Mexico that he claims to be effective alternative medicine vaccine therapies for cancer and HIV, among other diseases. His claims lack scientific support, and are disputed by medical doctors. David Gorski, a cancer surgeon and research scientist, evaluated the science sections of Chachoua’s website, and found the case histories unconvincing and the scientific rationale implausible. He characterized it as “a lot of horrifying pseudoscience.”