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Targeted Oncology

, Volume 13, Issue 6, pp 735–743 | Cite as

Impact of Delayed Addition of Anti-EGFR Monoclonal Antibodies on the Outcome of First-Line Therapy in Metastatic Colorectal Cancer Patients: a Retrospective Registry-Based Analysis

  • Ondrej Fiala
  • Veronika Veskrnova
  • Renata Chloupkova
  • Alexandr Poprach
  • Igor Kiss
  • Katerina Kopeckova
  • Ladislav Dusek
  • Lubomir Slavicek
  • Milan Kohoutek
  • Jindrich Finek
  • Marek Svoboda
  • Lubos Petruzelka
  • Ludmila Boubliková
  • Josef Dvorak
  • Bohuslav Melichar
  • Tomas BuchlerEmail author
Original Research Article

Abstract

Background

The addition of monoclonal antibodies targeting the epidermal growth factor receptor (anti-EGFR Abs) to chemotherapy for metastatic colorectal carcinoma (mCRC) is commonly delayed in the real-world clinical practice, usually because of late RAS testing results.

Objective

To determine whether delayed addition of anti-EGFR mAbs up to the fourth cycle of backbone chemotherapy adversely affected outcomes of mCRC patients treated with first-line regimens.

Patients and Methods

Clinical data of patients with histologically verified, RAS wild-type mCRC treated with first-line systemic therapy regimens containing anti-EGFR mAbs were retrospectively analysed from a national database. Patients were divided into three groups according to the timing of anti-EGFR mAbs addition to the chemotherapy backbone. Cohort A (n = 401) included patients in whom anti-EGFR mAbs were added to chemotherapy from the first cycle, cohort B (n = 71) patients with anti-EGFR mAbs added to chemotherapy from the second cycle, and cohort C (n = 101) patients who had anti-EGFR mAbs added to chemotherapy from the third or fourth cycle.

Results

Three hundred and thirty-six (58.6%) patients received panitumumab and 237 (41.4%) patients received cetuximab. The median progression-free survival (PFS) of the whole cohort was 12.2 months (95% confidence interval [CI] 10.9–13.5), and the median overall survival (OS) was 33.5 months (95% CI 27.6–39.4). The median PFS and OS for patients treated with anti-EGFR mAbs added to chemotherapy were 12.9 (95% CI 11.5–14.3) and 30.6 months (95% CI 25.2–36.1) for cohort A, 9.7 (95% CI 9.1–10.3) and not reached for cohort B, compared to 11.5 (95% CI 9.8–13.2) and 37.9 months (95% CI 28.6–47.3) for cohort C, respectively.

Conclusions

Delayed addition of anti-EGFR mAbs to first-line chemotherapy was not associated with inferior survival or response rates.

Notes

Acknowledgments

We would like to thank the following heads of the comprehensive cancer centres for the permission to use data of patients from their respective regional networks: Dr. Martina Chodacka, Chomutov Hospital and Masaryk Hospital in Usti nad Labem; Dr. Vaclav Janovsky, Ceske Budejovice Hospital; Dr. Otakar Bednarik, University Hospital, Brno; Dr. Jana Prausova, Motol University Hospital, Prague; Dr. David Feltl, University Hospital, Ostrava; Professor Jiri Petera, University Hospital, Hradec Kralove; Dr. Jana Katolicka, St Anna University Hospital, Brno; Professor Rostislav Vyzula, Masaryk Memorial Institute of Oncology, Brno; Dr. Jiri Bartos, County Hospital, Liberec; Dr. Martin Safanda, Na Homolce Hospital, Prague; Dr. Renata Soumarova, Novy Jicin Hospital; Professor Jitka Abrahamova, Thomayer Hospital, Prague. We are also indebted to all physicians who provided data for the CORECT registry.

Compliance with Ethical Standards

Funding

This study was supported by grants AZV 15-26535A from the Czech Health Research Council, “Center of Clinical and Experimental Liver Surgery”, UNCE/MED/006, and the National Sustainability Program I (NPU I) Nr. LO1503 from the Ministry of Education Youth and Sports of the Czech Republic.

Conflict of Interest

T. Buchler, and B. Melichar have received research funding, travel grants, and honoraria from Roche, Merck, Bayer, Servier, BMS, MSD, Sanofi, and Amgen. O. Fiala received honoraria from Roche, Merck, and Amgen. J. Finek has received consulting fees and lecture honoraria from Roche, Bayer, BMS, Sanofi, Pierre Fabre, and Amgen. M. Svoboda received consulting fees from Amgen. V. Veskrnova, R. Chloupkova, K. Kopeckova, I. Kiss, L. Dusek, L. Slavicek, M. Kohoutek, A. Poprach, L. Petruzelka, L. Boublikova, and J. Dvorak declare no conflict of interest that might be relevant to the contents of the manuscript.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Ondrej Fiala
    • 1
    • 2
  • Veronika Veskrnova
    • 3
  • Renata Chloupkova
    • 4
  • Alexandr Poprach
    • 5
  • Igor Kiss
    • 5
  • Katerina Kopeckova
    • 6
  • Ladislav Dusek
    • 4
  • Lubomir Slavicek
    • 7
  • Milan Kohoutek
    • 8
  • Jindrich Finek
    • 1
  • Marek Svoboda
    • 5
  • Lubos Petruzelka
    • 9
  • Ludmila Boubliková
    • 3
  • Josef Dvorak
    • 3
  • Bohuslav Melichar
    • 10
  • Tomas Buchler
    • 3
    Email author
  1. 1.Department of OncologyUniversity HospitalPilsenCzech Republic
  2. 2.Biomedical Center, Faculty of Medicine in PilsenCharles UniversityPragueCzech Republic
  3. 3.Department of Oncology, First Faculty of MedicineCharles University and Thomayer University HospitalPragueCzech Republic
  4. 4.Institute of Biostatistics and Analyses, Faculty of MedicineMasaryk UniversityBrnoCzech Republic
  5. 5.Department of Comprehensive Cancer Care and Faculty of MedicineMasaryk Memorial Cancer Institute and Masaryk UniversityBrnoCzech Republic
  6. 6.Department of Oncology, Motol University Hospital and Second Faculty of MedicineCharles UniversityPragueCzech Republic
  7. 7.Department of OncologyJihlava Hospital Comprehensive Cancer CentreJihlavaCzech Republic
  8. 8.Department of OncologyT Bata Hospital and Comprehensive Cancer CentreZlinCzech Republic
  9. 9.Department of OncologyGeneral University Hospital and Charles University First Faculty of MedicinePragueCzech Republic
  10. 10.Department of OncologyPalacky University Medical School and Teaching HospitalOlomoucCzech Republic

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