Abstract
Purpose
To identify the optimum response criteria for first-line targeted pazopanib therapy in patients with mRCC using solid tumor response criteria and clinical risk factors.
Methods
Pre- and post-treatment CTs of patients (n = 43) with mRCC treated with first-line pazopanib therapy were analyzed retrospectively. Treatment response was evaluated with Response Evaluation Criteria in Solid Tumors (RECIST) v1.1, Choi, modified Choi (mChoi), revised Choi (rChoi), MASS (Morphology, Attenuation, Size, and Structure), 10% threshold criteria, and subjective assessment. Memorial Sloan-Kettering Cancer Center and International Metastatic Renal Cell Carcinoma Database Consortium clinical risk factors were also used to define response groups. Response evaluations were correlated with overall survival (OS) and progression-free survival (PFS) using log-rank test.
Results
Patients with partial response (PR) by mChoi and rChoi had longer OS than those with stable disease (SD) (P < 0.001). Responders by 10% threshold criteria also had better OS, without or combined with clinical criteria. Patients with PR by rChoi, mChoi, RECIST v1.1, MASS criteria, and by subjective assessment had longer PFS than those with SD. rChoi and mChoi criteria best delineated the difference in PFS for patients with PR versus SD, without or combined with clinical criteria.
Conclusion
For mRCC patients treated with pazopanib, OS and PFS for PR and SD groups were best predicted by rChoi and mChoi criteria, without or combined with clinical risk factors. 10% threshold criteria also predicted OS and PFS, whereas RECIST did so only in a limited number of patients.
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Funding
Supported by the NIH/NCI under Award Number P30CA016672 and used the CCSG Biostatistics Resource Group.
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Shiva Gupta, MD; Hyunseon Christine Kang, MD PhD; Jia Sun, PhD; and Haesun Choi, MD have no disclosures. Marc R. Matrana, MD—Speaker’s Bureau: BMS, AstraZeneca, Janssen, Genentech, Eisai, Merck; Consultant: Strata Oncology, AstraZeneca. No funding was received for this study. Nizar M. Tannir, MD—Honoraria: Pfizer, Novartis, Bristol-Myers Squibb, Exelixis, Nektar; Calithera Biosciences, Eisai Medical Research, Ono Pharmaceutical; Consultant: Novartis; Exelixis, BMS, Nektar, Pfizer, Eisai, Calithera Biosciences Inc., Ono Pharmaceutical, Oncorena. Research Funding: BMS, Novartis, Exelixis, Epizyme, Mirati Therapeutics. No funding was received for this study.
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Gupta, S., Kang, H.C., Sun, J. et al. Tumor response criteria for assessing pazopanib first-line therapy in patients with metastatic renal cell carcinoma (mRCC). Abdom Radiol 45, 1872–1882 (2020). https://doi.org/10.1007/s00261-019-02354-z
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DOI: https://doi.org/10.1007/s00261-019-02354-z