Hepatic and Extrahepatic Colorectal Metastases Have Discordant Responses to Systemic Therapy. Pathology Data from Patients Undergoing Simultaneous Resection of Multiple Tumor Sites

• Published in: Cancers Vol. 13; no. 3; p. 464
• Main Authors: Vigano, Luca, Corleone, Pio, Darwish, Shadya Sara, Turri, Nicolò, Famularo, Simone, Viggiani, Lorenzo, Rimassa, Lorenza, Del Fabbro, Daniele, Di Tommaso, Luca, Torzilli, Guido
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 26.01.2021; MDPI
• Subjects: Cancer therapies; Chemotherapy; Colorectal cancer; Colorectal carcinoma; colorectal hepatic and extrahepatic metastases; Irinotecan; Liver; lung metastases; Lymph nodes; Lymphatic system; Medical prognosis; Metastases; Metastasis; Multivariate analysis; Oxaliplatin; Pathology; Patients; peritoneal metastases; Peritoneum; systemic therapy; targeted therapies; Toxicity; response to chemotherapy; peritoneal metastases; targeted therapies; lung metastases; colorectal hepatic and extrahepatic metastases; lymph node metastases; systemic therapy; chemotherapy; tumor regression grade
• ISSN: 2072-6694; 2072-6694
• DOI: 10.3390/cancers13030464

Systemic therapy is the standard treatment for patients with hepatic and extrahepatic colorectal metastases. It is assumed to have the same effectiveness on all disease foci, independent of the involved organ. The present study aims to compare the response rates of hepatic and extrahepatic metastases to systemic therapy. All consecutive patients undergoing simultaneous resection of hepatic and extrahepatic metastases from colorectal cancer after oxaliplatin- and/or irinotecan-based preoperative chemotherapy were analyzed. All specimens were reviewed. Pathological response to chemotherapy was classified according to tumor regression grade (TRG). We analyzed 45 patients undergoing resection of 134 hepatic and 72 extrahepatic metastases. Lung and lymph node metastases had lower response rates to chemotherapy than liver metastases (TRG 4-5 95% and 100% vs. 67%, = 0.008, and = 0.006). Peritoneal metastases had a higher pathological response rate than liver metastases (TRG 1-3 66% vs. 33%, < 0.001) and non-hepatic non-peritoneal metastases (3%, < 0.001). Metastases site was an independent predictor of pathological response to systemic therapy. Response to chemotherapy of distant metastases from colorectal cancer varies in different organs. Systemic treatment is highly effective for peritoneal metastases, more so than liver metastases, while it has a very poor impact on lung and lymph node metastases.