by European Society for Medical Oncology Credit: Unsplash/CC0 Public Domain In a prospective phase II study that involved patients with mismatch repair–deficient locally advanced rectal cancer, treatment with neoadjuvant single-agent, PD1 inhibitor dostarlimab resulted in a clinical complete response—as measured by the combination of rectal MRI, visual endoscopic inspection, and digital rectal examination—in all included...