Interim results of neoadjuvant immunotherapy with prolgolimab in patients with locally advanced MSI / DMMR colorectal cancer

Introduction: Colorectal cancer is one of the leading malignancies in Russia [1]. The standard approach for selected patients (pts) with locally advanced colon cancer is surgery with adjuvant chemotherapy. Several studies have shown that colorectal cancer (CRC) with presence of a disorder in the mismatch repair (dMMR) / microsatellite instability (MSI) is characterized with high sensitivity to the immune checkpoint inhibitors. Several studies have shown that MSI / dMMR CRC patients tend to be more responsive to immune checkpoint inhibitors such as pembrolizumab, nivolumab or ipilimumab. However, there was no information about the efficacy of prolgolimab, a PD-1 receptor blocking antibody. Prolgolimab was highly effective in melanoma treatment, while the toxicity was comparable to pembrolizumab and nivolumab.