A randomized phase II trial of CRLX101 in combination with bevacizumab versus standard of care in patients with advanced renal cell carcinoma

Martin H. Voss, A. Hussain, N. Vogelzang, J. L. Lee, B. Keam, S. Y. Rha, U. Vaishampayan, W. B. Harris, S. Richey, J. M. Randall, D. Shaffer, A. Cohn, T. Crowell, J. Li, A. Senderowicz, E. Stone, R. Figlin, R. J. Motzer, N. B. Haas, T. Hutson

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43 Citations (Scopus)


Background: Nanoparticle-drug conjugates enhance drug delivery to tumors. Gradual payload release inside cancer cells augments antitumor activity while reducing toxicity. CRLX101 is a novel nanoparticle-drug conjugate containing camptothecin, a potent inhibitor of topoisomerase I and the hypoxia-inducible factors 1α and 2α. In a phase Ib/2 trial, CRLX101+bevacizumab was well tolerated with encouraging activity in metastatic renal cell carcinoma (mRCC). We conducted a randomized phase II trial comparing CRLX101+bevacizumab versus standard of care (SOC) in refractory mRCC. Patients and methods: Patients with mRCC and 2-3 prior lines of therapy were randomized 1: 1 to CRLX101+bevacizumab versus SOC, defined as investigator's choice of any approved regimen not previously received. The primary end point was progression-free survival (PFS) by blinded independent radiological review in patients with clear cell mRCC. Secondary end points included overall survival, objective response rate and safety. Results: In total, 111 patients were randomized and received ≥ 1 dose of drug (CRLX101+bevacizumab, 55; SOC, 56). Within the SOC arm, patients received single-agent bevacizumab (19), axitinib (18), everolimus (7), pazopanib (4), sorafenib (4), sunitinib (2), or temsirolimus (2). In the clear cell population, the median PFS on the CRLX101+bevacizumab and SOC arms was 3.7 months (95% confidence interval, 2.0-4.3) and 3.9 months (95% confidence interval 2.2-5.4), respectively (stratified log-rank P = 0 .831). The objective response rate by IRR was 5% with CRLX101+bevacizumab versus 14% with SOC (Mantel-Haenszel test, P = 0.836). Consistent with previous studies, the CRLX101+bevacizumab combination was generally well tolerated, and no new safety signal was identified. Conclusions: Despite promising efficacy data on the earlier phase Ib/2 trial of mRCC, this randomized trial did not demonstrate improvement in PFS for the CRLX101+bevacizumab combination when compared with approved agents in patients with heavily pretreated clear cell mRCC. Further development in this disease is not planned.

Original languageEnglish
Pages (from-to)2754-2760
Number of pages7
JournalAnnals of Oncology
Issue number11
Publication statusPublished - 2017 Nov

Bibliographical note

Funding Information:
This trial was supported by Cerulean Pharmaceuticals (no grant number applies).

Publisher Copyright:
© The Author 2017. Published by Oxford University Press on behalf of the European Society for Medical Oncology. All rights reserved.

All Science Journal Classification (ASJC) codes

  • Hematology
  • Oncology


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