Dohan A, Gallix B, Guiu B, Le Malicot K, Reinhold C, Soyer P, Bennouna J, Ghiringhelli F, Barbier E, Boige V, Taieb J, Bouché O, François E, Phelip JM, Borel C, Faroux R, Seitz JF, Jacquot S, Ben Abdelghani M, Khemissa-Akouz F, Genet D, Jouve JL, Rinaldi Y, Desseigne F, Texereau P, Suc E, Lepage C, Aparicio T, and Hoeffel C
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., Competing Interests: Competing interests: VB reports consultingor/and advisory boards for Merck Serono, Ipsen, Prestizia, Eisai, and Bayer. DrBoige has received honoraria for Merck Serono, Sanofi, Amgen, MSD and Bayer. CL reports personal grants for boardmembership for AAA, grants from Novartis and travel grants from Ipsen Pharma,Amgen and Bayer. OB reports personalgrants for consultancy for A mgen, Merck, Roche, Bayer; payment forlectures including service onspeakers bureau for Servier, Pierre Fabre ; and travel grants from Roche,Lilly. CB reports consultingfor BMS ; payment for lectures for Merck Serono et BMS ; Paymentsfor development of educational presentations for Aztra-Zenecaand BMS; travel grants from Merck Serono and Aztra-Zeneca; Advisory Boardmembership for BMS and Aztra-Zeneca. EF reports personal grants for boardmembership for Roche, Merck and Sanofi. JB reports personal grants for boardmembership for Roche, Boehringer-Ingelheim, Astra-Zeneca, Servier and BMS;payment for lectures including service on speaker bureau for Roche,Astra-Zeneca and travel grants from Roche and BMS. JT reports personal grantsfor consultancy for Abbvie, Amgen, Baxalta, Celgene, Lilly, Merck, Roche,Servier, MSD, Pierre-Fabre and Sanofi; payment for lectures including serviceon speakers bureau for ABBVIE, Amgen, Celgene, Lilly, Merck, Roche; paymentsfor development of educational presentations for Roche and travel grants fromRoche and Merck. J-MP reports personal grants for board membership for Roche,Sanofi, Lilly Merck and Amgen; consultancy for Lilly and Roche; payments fordevelopment of educational presentations for Roche, Sanofi, Lilly Merck andAmgen; grants for his institution for board membership for Roche and Merck ;payments of grants form Merck and Roche. J-FS reports personal grants forconsultancy for Celgene, Lilly, Merck, Novartis Oncology, Pfizer, Sanofi,Roche; grants from Roche; payments for development of educational presentationsfor Amgen and Lilly; travel grants from Ipsen Pharma and Merck. F-KAreports consultancy for Sanofi as Board member and travelgrants from Roche, Bayer and Ipsen. M-BA reports consulting and travel supportfrom Amgen, Bayer, Merck, Roche, Sanofi, and Ipsen. T A reports personal grants Consultancy for Pierre Fabre; Grantsfrom Roche and Amgen; Payments for development of educational presentations forNovartis Oncology, Pfizer, Sanofi, Roche; Travel grants from Ipsen Pharma,Novartis Oncology, Sanofi, Roche., (© Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.)