Cancer Drug Trial News: What do we know about a drug trial in which cancer disappeared in every patient?

Cancer Drug Trial Rectal Cancer: In a small clinical trial which was conducted in the US, 18 patients with rectal cancer took a drug called ‘Dostarlimab’ for around 6 months, and in the end, every one of them saw their tumors disappear. 

source https://www.jagranjosh.com/current-affairs/cancer-drug-trial-news-what-do-we-know-about-a-drug-trial-in-which-cancer-disappeared-in-every-patient-1654664558-1