TY - JOUR T1 - Early evaluation using a radiomic signature of unresectable hepatic metastases to predict outcome in patients with colorectal cancer treated with FOLFIRI and bevacizumab JF - Gut JO - Gut SP - 531 LP - 539 DO - 10.1136/gutjnl-2018-316407 VL - 69 IS - 3 AU - Anthony Dohan AU - Benoit Gallix AU - Boris Guiu AU - Karine Le Malicot AU - Caroline Reinhold AU - Philippe Soyer AU - Jaafar Bennouna AU - Francois Ghiringhelli AU - Emilie Barbier AU - Valérie Boige AU - Julien Taieb AU - Olivier Bouché AU - Eric François AU - Jean-Marc Phelip AU - Christian Borel AU - Roger Faroux AU - Jean-Francois Seitz AU - Stéphane Jacquot AU - Meher Ben Abdelghani AU - Faiza Khemissa-Akouz AU - Dominique Genet AU - Jean Louis Jouve AU - Yves Rinaldi AU - Françoise Desseigne AU - Patrick Texereau AU - Etienne Suc AU - Come Lepage AU - Thomas Aparicio AU - Christine Hoeffel A2 - , Y1 - 2020/03/01 UR - http://gut.bmj.com/content/69/3/531.abstract N2 - Purpose The objective of this study was to build and validate a radiomic signature to predict early a poor outcome using baseline and 2-month evaluation CT and to compare it to the RECIST1·1 and morphological criteria defined by changes in homogeneity and borders.Methods This study is an ancillary study from the PRODIGE-9 multicentre prospective study for which 491 patients with metastatic colorectal cancer (mCRC) treated by 5-fluorouracil, leucovorin and irinotecan (FOLFIRI) and bevacizumab had been analysed. In 230 patients, computed texture analysis was performed on the dominant liver lesion (DLL) at baseline and 2 months after chemotherapy. RECIST1·1 evaluation was performed at 6 months. A radiomic signature (Survival PrEdiction in patients treated by FOLFIRI and bevacizumab for mCRC using contrast-enhanced CT TextuRe Analysis (SPECTRA) Score) combining the significant predictive features was built using multivariable Cox analysis in 120 patients, then locked, and validated in 110 patients. Overall survival (OS) was estimated with the Kaplan-Meier method and compared between groups with the logrank test. An external validation was performed in another cohort of 40 patients from the PRODIGE 20 Trial.Results In the training cohort, the significant predictive features for OS were: decrease in sum of the target liver lesions (STL), (adjusted hasard-ratio(aHR)=13·7, p=1·93×10–7), decrease in kurtosis (ssf=4) (aHR=1·08, p=0·001) and high baseline density of DLL, (aHR=0·98, p<0·001). Patients with a SPECTRA Score >0·02 had a lower OS in the training cohort (p<0·0001), in the validation cohort (p<0·0008) and in the external validation cohort (p=0·0027). SPECTRA Score at 2 months had the same prognostic value as RECIST at 6 months, while non-response according to RECIST1·1 at 2 months was not associated with a lower OS in the validation cohort (p=0·238). Morphological response was not associated with OS (p=0·41).Conclusion A radiomic signature (combining decrease in STL, density and computed texture analysis of the DLL) at baseline and 2-month CT was able to predict OS, and identify good responders better than RECIST1.1 criteria in patients with mCRC treated by FOLFIRI and bevacizumab as a first-line treatment. This tool should now be validated by further prospective studies.Trial registration Clinicaltrial.gov identifier of the PRODIGE 9 study: NCT00952029.Clinicaltrial.gov identifier of the PRODIGE 20 study: NCT01900717. ER -