Spontaneous Regression of Advanced Transverse Colon Cancer: A Case Report.

Introduction: The incidence of spontaneous regression (SR) of malignancy is one in 60000-100000 cancer patients and spontaneous regression in colorectal cancer is quite rare, reported to account for less than 2% of spontaneous regression of malignancy. In recent years, some reports of spontaneous regression in colorectal cancer in patients with high-frequency microsatellite instability have suggested a deep association between high-frequency microsatellite instability and spontaneous regression. We report our experience of spontaneous regression of advanced colorectal cancer with high-frequency microsatellite instability and provide a review of spontaneous regression in colorectal cancer.