Data from Liquid Biopsy Detects Early Molecular Response and Predicts Benefit to First-Line Chemotherapy plus Cetuximab in Metastatic Colorectal Cancer: PLATFORM-B Study

Autor: Clara Montagut, Ramon Salazar, Enrique Aranda, Josep Tabernero, Beatriz Bellosillo, Fernando Rivera, Javier Sastre, Estela Pineda, Ferran Losa, Reyes Ferreiro, Rocío Garcia-Carbonero, José Luís Manzano, Elena Elez, Gema Durán, Cristina Santos, Maria Teresa Cano, Vicente Alonso, Marta Guix, David Páez, Pilar García-Alfonso, David Casadevall, Maria Concepción Fernández-Rodríguez, Joana Vidal
Rok vydání: 2023
ISSN: 1078-0432
DOI: 10.1158/1078-0432.c.6532748.v1
Popis: Purpose:Chemotherapy plus anti-EGFR is standard first-line therapy in RAS wild-type (wt) metastatic colorectal cancer (mCRC), but biomarkers of early response are clinically needed. We aimed to define the utility of ctDNA to assess early response in patients with mCRC receiving first-line anti-EGFR therapy.Experimental Design:Prospective multicentric study of tissue patients with RAS wt mCRC treated with first-line chemotherapy plus cetuximab undergoing sequential liquid biopsies. Baseline and early (C3) ctDNA were analyzed by NGS. Trunk mutations were assessed as surrogate marker of total tumor burden. RAS/BRAF/MEK/EGFR-ECD were considered mutations of resistance. ctDNA results were correlated with clinical outcome.Results:One hundred patients were included. ctDNA was detected in 72% of patients at baseline and 34% at C3. Decrease in ctDNA trunk mutations correlated with progression-free survival (PFS; HR, 0.23; P = 0.001). RAS/BRAF were the only resistant mutations detected at C3. An increase in the relative fraction of RAS/BRAF at C3 was followed by an expansion of the RAS clone until PD, and was associated with shorter PFS (HR, 10.5; P < 0.001). The best predictor of response was the combined analysis of trunk and resistant mutations at C3. Accordingly, patients with “early molecular response” (decrease in trunk and decrease in resistant mutations) had better response (77.5% vs. 25%, P = 0.008) and longer PFS (HR, 0.18; P < 0.001) compared with patients with “early molecular progression” (increase in trunk and/or increase in resistant mutations).Conclusions:ctDNA detects early molecular response and predicts benefit to chemotherapy plus cetuximab. A comprehensive NGS-based approach is recommended to integrate information on total disease burden and resistant mutations.See related commentary by Eluri et al., p. 302
Databáze: OpenAIRE