In a study of two million people with breast cancer, those who used complementary and alternative medicine (CAM) had a substantially increased risk of dying over a five-year span compared to people undergoing mainstream treatment (surgery, radiation, chemotherapy, immunotherapy, and endocrine therapy). This was true even if both CAM and conventional treatments were used — the theory being that some patients may have opted out of some mainstream treatments. Here's @Gizmodo@flipboard.com's story at the first link, plus the JAMA Network writeup at the second.

https://flip.it/6rW6jx
https://flip.it/3o94-D