According to me. A blog post, press release, etc which claims to have cured or have developed a treatment for, at least one form of cancer
Reference class for "announces a treatment": the September result (the ART reverse-transcriptase system, found by a search over 200,000 reverse transcriptases and then validated at the bench by human scientists) was computational plus in vitro. A cancer-treatment claim needs an in-vivo result, and the fastest in-vivo setting for a new oncology idea is a dog with a spontaneous tumour: the AI-designed personalized mRNA vaccine for Rosie went from a chatbot session to dosing at a Queensland vet in a matter of months, with the construct built at the UNSW RNA Institute, and showed partial shrinkage before the cancer recurred. If a YES comes, it is far more likely to look like that, a single-animal or in-vitro result, than a human readout. Where the dog trial infrastructure stands (mine): https://w0lph.github.io/k9/trials/
