Multicenter real-life evaluation of the Post-CAR prognostic index for patients with large B-cell lymphoma after CAR-T failure

Abstract Most patients with large B-cell lymphoma (LBCL) progressing after CAR-T therapy experience poor survival and lack standardized treatment strategies. Prognostic tools are needed to guide decision-making at relapse. The Post-CAR Prognostic Index (PC-PI), recently proposed by Iacoboni et al., combines five routine clinical variables to stratify outcomes after CAR-T failure: ECOG (> 0), hemoglobin (< 10 g/dL), LDH (≥ 2xULN), number of extranodal sites (> 1) and time from CAR-T to progression (< 4 months). We evaluated the PC-PI in a retrospective multicenter study including 125 LBCL patients relapsing or refractory after axicabtagene-ciloleucel or tisagenlecleucel, treated between 2019 and 2023 across 16 Italian centers belonging to the Fondazione Italiana Linfomi network. Median overall survival (OS) was 4.9 months, with 6- and 12-month OS rates of 44.9% and 28.5%, respectively. The PC-PI discriminated prognosis effectively: high-risk patients had a median OS of 1.8 months, intermediate-high 2.2, intermediate-low 8.7, while in the low-risk group median OS was not reached (p