"Very Promising", quoted by this BBC article regarding stopping cancer cells repairing themselves.
A while back here, we've seen many "Very Promising" cancer research articles which were unreliable, but this one seems credible, already in Phase 1, meaning human testing! Also, like the fact, this treatment is not specific to the origin of tumor, Bowel Cancer, Breast Cancer, Prostate Cancer, etc.
Institutions involved, Institute of Cancer Research (ICR) and the Royal Marsden NHS.