Inflammatory indices and clinical factors in metastatic renal cell carcinoma patients treated with nivolumab: the development of a novel prognostic score (Meet-URO 15 study).

Background: Despite the survival advantage, not all metastatic renal cell carcinoma (mRCC) patients achieve a long-term benefit from immunotherapy. Moreover, the identification of prognostic biomarkers is still an unmet clinical need.
Methods: This multicenter retrospective study investigated the prognostic role of peripheral-blood inflammatory indices and clinical factors to develop a novel prognostic score in mRCC patients receiving at least second-line nivolumab. The complete blood count before the first cycle of therapy was assessed by calculating neutrophil-to-lymphocyte ratio (NLR), derived NLR (dNLR), lymphocyte-to-monocyte ratio (LMR), platelet-to-lymphocyte ratio (PLR), systemic inflammation index (SII), and systemic inflammation response index (SIRI). Clinical factors included pre-treatment International Metastatic RCC Database Consortium (IMDC) score, line of therapy, and metastatic sites.
Results: From October 2015 to November 2019, 571 mRCC patients received nivolumab as second- and further-line treatment in 69% and 31% of cases. In univariable and multivariable analyses all inflammatory indices, IMDC score, and bone metastases significantly correlated with overall survival (OS). The multivariable model with NLR, IMDC score, and bone metastases had the highest c-index (0.697) and was chosen for the developing of the score (Schneeweiss scoring system). After internal validation (bootstrap re-sampling), the final index (Meet-URO score) composed by NLR, IMDC score, and bone metastases had a c-index of 0.691. It identified five categories with distinctive OSs: group 1 (median OS - mOS = not reached), group 2 (mOS = 43.9 months), group 3 (mOS = 22.4 months), group 4 (mOS = 10.3 months), and group 5 (mOS = 3.2 months). Moreover, the Meet-URO score allowed for a fine risk-stratification across all three IMDC groups.
Conclusion: The Meet-URO score allowed for the accurate stratification of pretreated mRCC patients receiving nivolumab and is easily applicable for clinical practice at no additional cost. Future steps include its external validation, the assessment of its predictivity, and its application to first-line combinations.
Competing Interests: Conflict of interest statement: Dr Fornarini services advisory boards for Astellas, Janssen, Pfizer, Bayer, MSD, and Merck, and received travel accommodation from Astellas, Janssen, and Bayer. Dr Buti received honoraria as a speaker at scientific events and in an advisory role by BMS, Pfizer; MSD, Ipsen, Roche, Eli Lilly, AstraZeneca, Pierre-Fabre, Novartis. Dr Banna reports personal fees from AstraZeneca, Janssen-Cilag, Boehringer Ingelheim, Roche, and non-financial support from Bristol-Myers Squibb, AstraZeneca, MedImmune, Pierre Fabre, IPSEN, outside the submitted work. Dr De Giorgi services as an advisory/board member of Astellas, Bayer, Bristol-Myers Squibb, IPSEN, Janssen, Merck, Pfizer, and Sanofi, received research grant/funding to the institution from AstraZeneca, Roche, Sanofi, and travel/accommodations/expenses from Bristol-Myers Squibb, IPSEN, Janssen, and Pfizer. Dr Zucali services advisory boards/consulting for Pfizer, Bristol-Myers Squibb, MSD, IPSEN, Novartis, Roche, Amgen, AstraZeneca, Sanofi, Janssen, and Astellas. Dr Masini received personal fees as a speaker from Astellas, as a consultant from IPSEN, MSD, and Janssen, and for travel accommodation from BMS, Pfizer, Astellas, Janssen, and IPSEN. Dr Procopio services advisory boards/consulting for Astellas, AstraZeneca, Bayer, Bristol-Myers Squibb, Janssen, IPSEN, Merk, MSD, Novartis, and Pfizer. Dr Cortellini receives speaker fees/grant consultancies from Astrazeneca, BMS, MSD, Roche, Novartis, and Astellas. Dr Morelli received grants from MSD and Pfizer. Dr Bersanelli received research funding to the institution from Roche, Pfizer, Seqirus UK, AstraZeneca, Bristol-Myers Squibb, Novartis, and Sanofi, and received personal fees for advisory role, copyright transfer, consultancies, and as speaker at scientific events from Sciclone Pharmaceuticals, Bristol-Myers Squibb, AstraZeneca, Pierre-Fabre, Novartis, and Pfizer. The other authors have no conflicts of interest to disclose.
(© The Author(s), 2021.)