Data on patients with mismatch repair deficiency (MMRD) CRC, the majority of whom could not undergo surgery due to various health conditions unrelated to cancer, were presented at the 2023 American Society of Clinical Oncology Gastrointestinal Cancers Symposium (ASCO GI). Instead of radiation therapy or chemotherapy, the patients received immunotherapy with checkpoint inhibitors. It should be noted that the patients were treated outside of clinical trials.
The overall response rate in this patient group was 74%, with 57% of those who responded experiencing complete tumor regression. Some of the patients have been in complete remission for a year or more after their diagnoses. The data indicate that immunotherapy is an effective treatment for patients who are unable to undergo surgery for a variety of reasons, including advanced age or a variety of health issues.