Randomized study of etirinotecan pegol versus irinotecan as second-line treatment for metastatic colorectal cancer

Heinz-Josef Lenz, Philip Philip, Mark Saunders, Tatjana Kolevska, Kalyan Mukherjee, Leslie Samuel, Shailesh Bondarde, Tracy Dobbs, Mary Tagliaferri, Ute Hoch, Alison :. Hannah, Maurice Berkowitz

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


PURPOSE: Etirinotecan pegol (EP) is a long-acting topoisomerase-I inhibitor designed to provide sustained exposure to SN-38 (active metabolite of irinotecan). This phase II study compared EP versus irinotecan as second-line treatment for KRAS-mutant, irinotecan-naive, metastatic colorectal cancer (mCRC). METHODS: Patients were randomized to EP 145 mg/m(2) or irinotecan 350 mg/m(2) Q21d until disease progression/unacceptable toxicity. The primary endpoint was progression-free survival (PFS) with response determined by central radiologic review (RECIST version 1.1). RESULTS: The study was terminated before completing accrual due to evolving standards of care. Eighty-three patients were randomized. Median PFS was longer with EP versus irinotecan (4.0 versus 2.8 months, respectively; HR 0.65; 95% CI 0.40-1.04; P = 0.07). Six-month PFS rates were 32.8 and 15.4%, respectively. Median OS was 9.6 and 8.4 months in EP and irinotecan arms, respectively (HR 0.91; 95% CI 0.56-1.49). ORRs were 10 and 5%, respectively (P = 0.676); median DOR was significantly longer in EP arm (7.9 versus 1.4 months; P = 0.018). The most common grade-3/4 adverse events for EP and irinotecan were diarrhea (21 vs 20%), neutropenia (10 vs 22%), abdominal pain (14 vs 5%), nausea (14 vs 2%), and vomiting (12 vs 7%), respectively. CONCLUSION: EP is active and safe for second-line treatment of KRAS-mutant, irinotecan-naive mCRC.
Original languageEnglish
Pages (from-to)1161-1169
Number of pages9
JournalCancer Chemotherapy and Pharmacology
Issue number6
Early online date17 Oct 2017
Publication statusPublished - Dec 2017

Bibliographical note

Gregg Olsen, MD, East Valley Hematology and Oncology Medical Center, Sherman Oaks, CA, USA for enrolling patients; Phillips Gilmore Oncology Communications, Inc. for medical writing assistance, funded by Nektar Therapeutics.


  • chemotherapy
  • Etirinotecan pegol
  • irinotecan
  • KRAS mutant
  • metastatic colorectal cancer


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