In this work, we present combination data for the clinical candidate BI 1701963 with the MEK inhibitor trametinib and, in addition, with irinotecan, a key component of the widely used CRC standard-of-care chemotherapy treatment regimen. Both combinations show strong in vivo efficacy in tumor mouse models. The SOS1::KRAS/MEK inhibitor combination results in anti-tumor effects in a broad spectrum of KRAS-mutated CRC PDX models.