Impact of neoadjuvant chemotargeted therapy in patients with colorectal cancer and synchronous liver metastases in perioperative period

AIM: assess the impact of neoadjuvant chemotargeted therapy in patients with colorectal cancer and synchronous liver metastases in perioperative period. PATIENTS AND METHODS: a pilot prospective study included 30 patients with colorectal cancer and synchronous liver metastases (mCRC). The combined treatment included 3 cycles of neoadjuvant FOLFOXIRI chemotherapy with the addition of targeted agents: cetuximab (24 patients with wtKRAS) and bevacizumab (6 patients with mtKRAS) followed by radical surgery. RESULTS: the clinical and radiological response of colorectal cancer liver metastases to neoadjuvant chemotherapy (NACT) was complete in 4 (13.3%) patients and partial in 26 (86.7%) patients. Partial response to NACT in the primary tumor occurred in all patients. Adverse events of NACT were detected in 12 (40%) patients, 1 (3.3%) of them produced grade III toxicity. All patients underwent radical surgery (R0) 3–4 weeks after NACT, 28 (93.3%) of them underwent simultaneous colorectal and liver resection. Postoperative complications occurred in 21 (70%) patients, including grade I and grade IIIa complications (according to Сlavien-Dindo classification) — 22 (73.3%) and 2 (6.7%), respectively. Histology revealed pathologic complete response (pCR) of liver metastases in 1 (3.6%) case and pathological grade 3 regression of the primary tumor (TRG3, Mandard A.M.) in 23 (76.7%) patients. Two (6.7%) patients with complete clinical and radiological response of liver metastases, who did not undergo liver resection, had no evidence of disease progression 12 months after the treatment. CONCLUSION: in mCRC with synchronous liver metastases, NACT according to the FOLFOXIRI regimen in combination with targeted agents with a moderate toxicity profile provide significant carcinocidal effect without having a negative impact in the perioperative period. The study is ongoing to analyze 2-year disease-free and overall survival of patients.