Cited by 232Colorectal Cancer Treatments and StudiesMelanoma and MAPK PathwaysLung Cancer Treatments and Mutations

A Phase Ib Dose-Escalation Study of Encorafenib and Cetuximab with or without Alpelisib in Metastatic BRAF -Mutant Colorectal Cancer

Open access
van Geel, Robin M.J.M., Tabernero, Josep, Elez, Elena, Bendell, Johanna C., Spreafico, Anna, Schuler, Martin, Yoshino, Takayuki, Delord, Jean-Pierre +15 more·2017·Cancer Discovery

Published version of a preprint

Abstract

Preclinical evidence suggests that concomitant BRAF and EGFR inhibition leads to sustained suppression of MAPK signaling and suppressed tumor growth in BRAFV600E colorectal cancer models. Patients with refractory BRAFV600-mutant metastatic CRC (mCRC) were treated with a selective RAF kinase inhibitor (encorafenib) plus a monoclonal antibody targeting EGFR (cetuximab), with (n = 28) or without (n = 26) a PI3Kα inhibitor (alpelisib). The primary objective was to determine the maximum tolerated dose (MTD) or a recommended phase II dose. Dose-limiting toxicities were reported in 3 patients receiving dual treatment and 2 patients receiving triple treatment. The MTD was not reached for either group and the phase II doses were selected as 200 mg encorafenib (both groups) and 300 mg alpelisib. Combinations of cetuximab and encorafenib showed promising clinical activity and tolerability in patients with BRAF-mutant mCRC; confirmed overall response rates of 19% and 18% were observed and median progression-free survival was 3.7 and 4.2 months for the dual- and triple-therapy groups, respectively. Significance: Herein, we demonstrate that dual- (encorafenib plus cetuximab) and triple- (encorafenib plus cetuximab and alpelisib) combination treatments are tolerable and provide promising clinical activity in the difficult-to-treat patient population with BRAF-mutant mCRC. Cancer Discov; 7(6); 610–9. ©2017 AACR. See related commentary by Sundar et al., p. 558. This article is highlighted in the In This Issue feature, p. 539

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Crossref · 10.1158/2159-8290.cd-16-0795

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  • Combined BRAF and EGFR inhibition significantly improves response rates in BRAF V600E metastatic CRC patients (10% or 19%) and has become FDA-approved standard of care.

    “Recent clinical trials report that combined BRAF and EGFR inhibition significantly improves response rates in BRAF (V600E) metastatic CRC patients (10% or 19%) [10, 13], and has now become the FDA-approved, standard of care.”

    From An integrative gene expression signature analysis identifies CMS4 KRAS-mutated colorectal cancers sensitive to combined MEK and SRC targeted therapy (2022) · cites this paper as [13]

    The Results (Efficacy; page not provided) report a 19% response rate for dual BRAF–EGFR inhibition, and the Discussion reports a 10% rate in another study and describes improved efficacy. This phase Ib paper does not establish a statistically significant improvement or state that the combination was FDA-approved standard of care. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Combined EGFR and BRAF blockade proved synthetic lethality in preclinical models of BRAFV600E CRC and modestly improves survival of patients with advanced disease.

    “Combined EGFR and BRAF blockade proved synthetic lethality in preclinical models of BRAFV600E CRC and modestly improves survival of patients with advanced disease [7, 8, 15–17].”

    From Co-targeting SRC overcomes resistance to BRAF inhibitors in colorectal cancer (2025) · cites this paper as [16]

    The Introduction says preclinical evidence suggests combined EGFR and BRAF inhibition reduces proliferation and increases antitumor activity; it does not say synthetic lethality was proved. Results > Efficacy reports a 19% response rate and 3.7-month median progression-free survival for the dual combination, but does not establish improved overall survival. Page numbers are not available in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • In BRAFV600 colorectal cancer, targeting EGFR in combination with BRAF inhibition has led to an improvement in clinical efficacy.

    “Indeed, in BRAFV600 colorectal cancer, targeting EGFR—the RTK thought to be the primary driver of feedback reactivation from preclinical studies—in combination with BRAF inhibition, has led to an improvement in clinical efficacy (34–39).”
  • Two clinical trials showed that adding PI3K inhibitors to cetuximab did not improve PFS, ORR and OS in mCRC patients.

    “However, two clinical trials showed that adding PI3K inhibitors to cetuximab did not improve PFS, ORR and OS in mCRC patients [68,69].”

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Authors
van Geel, R. M. J. M., Tabernero, J., Elez, E., Bendell, J. C., Spreafico, A., Schuler, M., Yoshino, T., Delord, J.-P., Yamada, Y., Lolkema, M. P., Faris, J. E., Eskens, F. A. L. M., Sharma, S., Yaeger, R., Lenz, H.-J., Wainberg, Z. A., Avsar, E., Chatterjee, A., Jaeger, S., Tan, E., Maharry, K., Demuth, T., & Schellens, J. H. M.
Affiliations
  • 1The Netherlands Cancer Institute, Amsterdam, the Netherlands.
  • Universitat Autònoma de Barcelona (ES)
  • 2Vall d'Hebron University Hospital and Institute of Oncology (VHIO), Universitat Autònoma de Barcelona, Barcelona, Spain.
  • Sarah Cannon (US)
  • Princess Margaret Cancer Centre (CA)
  • 5West German Cancer Center, University Hospital Essen, University Duisburg-Essen, Essen, Germany, and German Cancer Consortium (DKTK), partner site University Hospital Essen, Essen, Germany.
  • 6National Cancer Center Hospital East, Chiba, Japan.
  • Institut Claudius Regaud (FR)
  • National Cancer Centre Japan (JP)
  • University Medical Center Utrecht (NL)
  • Massachusetts General Hospital (US)
  • Erasmus MC Cancer Institute (NL)
  • University of Utah (US)
  • Memorial Sloan Kettering Cancer Center (US)
  • University of Southern California (US)
  • UCLA Medical Center (US)
  • 16Novartis Pharmaceutical Corporation, East Hanover, New Jersey.
  • Novartis (Switzerland) (CH)
  • Array BioPharma (United States) (US)
  • Utrecht University (NL)
Corresponding author
Schellens, Jan H.M.
Venue
Cancer Discovery
Published
2017-06-01
Volume
7
Issue
6
Pages
610-619
ISSN
  • 2159-8274 (ISSN-L)
  • 2159-8290
OpenAlex
W2598954950
Cited by
232
References
46
Citations by year
2026: 8 · 2025: 16 · 2024: 16 · 2023: 29 · 2022: 38 · 2021: 27 · 2020: 35 · 2019: 30 · 2018: 23 · 2017: 10
FWCI
11.82
Type
journal article
Language
en
Open access
Locations
  • Cancer Discovery (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • EUR Research Repository (Erasmus University Rotterdam) (submittedVersion)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
  • Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
  • eScholarship (California Digital Library) (submittedVersion)
  • Research Publications (Maastricht University) (submittedVersion)
  • Utrecht University Repository (Utrecht University) (submittedVersion)
Funders
  • German Cancer Consortium (110534)
  • EU Seventh Framework Programme (259015)
Topics
  • Health Sciences › Medicine › Oncology › Colorectal Cancer Treatments and Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Melanoma and MAPK Pathways
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Lung Cancer Treatments and Mutations
Keywords
encorafenib, cetuximab, alpelisib, BRAF V600E mutation, metastatic colorectal cancer, Raf kinase inhibitor, EGFR inhibition, PI3Kα inhibitor, MAPK signaling, combination therapy, dose-limiting toxicity, maximum tolerated dose, triple therapy
MeSH terms
Cetuximab, Phosphoinositide-3 Kinase Inhibitors, Adult, Aged, Aged, 80 and over, Antineoplastic Agents, Antineoplastic Combined Chemotherapy Protocols, Carbamates, Female, Humans, Male, Middle Aged, Mutation, Sulfonamides, Thiazoles, Colorectal Neoplasms, Disease-Free Survival, Maximum Tolerated Dose, Protein Kinase Inhibitors, Proto-Oncogene Proteins B-raf

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