Abstract:
BACKGROUND:The combination of bevacizumab plus interferon (BEV+IFN) for treatment of metastatic renal cell carcinoma (mRCC) is associated with improved progression-free survival (PFS) in a phase 3 study. OBJECTIVE:To develop a novel model for prediction of individual PFS using data from the randomized, controlled phase 3 trial of BEV + IFN or interferon alone. The ability of the Motzer criteria for prediction of PFS was also assessed. DESIGN, SETTING, AND PARTICIPANTS:Pretreatment parameters of 628 patients were included in the Cox regression model predicting PFS at 6, 12, 18, and 24 mo. BEV+IFN was administered to 337 patients; 291 patients received interferon alone. The developed model and the Motzer criteria were internally validated using Harrell's concordance index and calibrated. RESULTS AND LIMITATIONS:Median PFS was 10.2 versus 4.6 mo (p < 0.001) for patients receiving BEV + IFN or interferon alone, respectively. The novel model relying on age, Karnofsky performance status, baseline albumin, alkaline phosphatase, and time from primary diagnosis to treatment resulted in the highest discrimination (area under the curve [AUC]: 72.8, 75.0, 72.8, and 70.8% at 6, 12, 18, and 24 mo). The AUC of the Motzer criteria risk groups was 63.7, 61.8, 58.6, and 51.8% for the same time points. Comparison of discriminatory ability between the developed model and the Motzer criteria showed statistically significant differences (all p ≤ 0.02). An external validation of the new model is warranted. CONCLUSIONS:The developed model identified prognostic factors of PFS in mRCC patients treated with BEV+IFN or interferon alone and quantified individual risk of PFS. Relative to the Motzer criteria, the novel model demonstrated better discriminatory properties. The model may serve clinicians in identifying patients who can benefit the most from BEV+IFN versus interferon alone.
journal_name
Eur Uroljournal_title
European urologyauthors
Karakiewicz PI,Sun M,Bellmunt J,Sneller V,Escudier Bdoi
10.1016/j.eururo.2010.12.011subject
Has Abstractpub_date
2011-07-01 00:00:00pages
48-56issue
1eissn
0302-2838issn
1873-7560pii
S0302-2838(10)01189-9journal_volume
60pub_type
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