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Eur Urol. 2016 Sep;70(3):469-75. doi: 10.1016/j.eururo.2015.12.031. Epub 2015 Dec 30.

Outcomes for Patients with Metastatic Renal Cell Carcinoma Achieving a Complete Response on Targeted Therapy: A Registry-based Analysis.

Author information

1
Department of Oncology, Thomayer Hospital and Charles University First Faculty of Medicine, Prague, Czech Republic. Electronic address: tomas.buchler@ftn.cz.
2
Institute of Biostatistics and Analyses, Faculty of Medicine, Masaryk University, Brno, Czech Republic.
3
Department of Comprehensive Cancer Care, Masaryk Memorial Cancer Institute, Brno, Czech Republic.
4
Department of Oncology, Thomayer Hospital and Charles University First Faculty of Medicine, Prague, Czech Republic.
5
Department of Oncology, General University Hospital and Charles University First Faculty of Medicine, Prague, Czech Republic.
6
Department of Oncology, University Hospital, Pilsen, Czech Republic.
7
Department of Oncology, Motol University Hospital and Charles University Second Faculty of Medicine, Prague, Czech Republic.
8
Department of Oncology, Palacky University Medical School and Teaching Hospital, Olomouc, Czech Republic.

Abstract

BACKGROUND:

It is currently not known whether treatment with anti-vascular endothelial growth factor agents for metastatic renal cell carcinoma (mRCC) can be safely discontinued in patients achieving a complete response (CR).

OBJECTIVE:

To assess outcomes for patients with mRCC achieving CR on targeted therapy (TT) and the survival of patients discontinuing TT after CR.

DESIGN, SETTING, AND PARTICIPANTS:

A national registry was used to identify patients achieving CR during first-line TT using bevacizumab, sunitinib, sorafenib, or pazopanib.

OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS:

Relationships with outcomes were analysed using a log-rank test.

RESULTS AND LIMITATIONS:

A total of 100 patients achieving CR were identified out of 2803 patients. The median time to CR was 10.1 mo. Median progression-free survival (PFS) from TT initiation was 3.8 yr (95% confidence interval [CI] 2.9-4.6 yr) and the 5-yr overall survival (OS) was 80% (95% CI 70-91%). Patients discontinuing TT within 1 mo after achieving CR and those continuing TT beyond CR had similar OS (CI for difference in 2-yr post-CR OS -13% to 19%; p=0.3) and PFS (CI for difference in 2-yr post-CR PFS -29% to 17%; p=0.7). The limitations include the retrospective, registry-based data analysis.

CONCLUSIONS:

Achievement of CR on TT for mRCC was associated with excellent long-term prognosis. No significant differences in post-CR survival were observed between patients discontinuing TT after the date of CR and those who continued on TT, although the wide CIs cannot exclude important differences between the groups.

PATIENT SUMMARY:

According to this registry-based analysis, patients with metastatic renal cancer with no signs of disease (complete response) after treatment with targeted agents experience excellent long-term survival even if the treatment does not continue beyond the date of complete response.

KEYWORDS:

Complete response; Renal cell carcinoma; Survival; Targeted therapy

PMID:
26746623
DOI:
10.1016/j.eururo.2015.12.031
[Indexed for MEDLINE]

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