The SCFAs were shown to be lower in the gut bacteria of patients achieving pathological complete response (pCR) compared with those not achieving pCR after surgery. According to Ross and her colleagues, they "dampen down the immune system’s ability to target cancer cells", as quoted in the AJMC article (1).
This points back to the fact that when it comes to personal health, it is very personal, and what is healthy for one person is not necessarily healthy for another person. As Herbsprout article quoted Viome CEO Naveen Jain, "one man's food is another man's poison." (2)