Dostarlimab is a drug with laboratory-produced molecules that act as substitute antibodies in the human body. All 18 rectal cancer patients were given the same drug and as a result of the treatment, cancer was completely obliterated in every patient - undetectable by physical exam; endoscopy; positron emission tomography or PET scans or MRI scans.
Apparently Dostarlimab is very expensive ($11,000 per dose), but hopefully as it gets more streamlined it becomes cheaper.