Liver metastases do not predict resistance to the addition of atezolizumab to first-line FOLFOXIRI plus bevacizumab in proficient MMR metastatic colorectal cancer: a secondary analysis of the AtezoTRIBE study

BACKGROUND: Liver metastases (LMs) are related to poor efficacy of immune checkpoint inhibitor (ICI)-containing therapies. In the AtezoTRIBE trial, Immunoscore-Immune-Checkpoint (immunoscore-IC) was a predictor of benefit from atezolizumab in mismatch repair-proficient (pMMR) metastatic colorectal cancer (mCRC). PATIENTS AND METHODS: In pMMR patients enrolled in the AtezoTRIBE study, we investigated the association of LMs with immune-related biomarkers and treatment outcomes, and the predictive role of immunoscore-IC in the LMs group. RESULTS: for PFS and OS = 0.166 and 0.473, respectively). CONCLUSIONS: LMs are associated with poor prognosis in pMMR mCRC and do not predict resistance to the addition of atezolizumab to FOLFOXIRI/bevacizumab. Immunoscore-IC seems to retain its predictive impact also among patients with LMs.