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Fukuhara T, Saito H, Furuya N, Watanabe K, Sugawara S, Iwasawa S, Tsunezuka Y, Yamaguchi O, Okada PM, Yoshimori K, Nakachi I, Gemma PA, Azuma K, Kurimoto F, Tsubata Y, Fujita Y, Nagashima H, Asai G, Watanabe S, Miyazaki M, Hagiwara PK, Nukiwa PT, Morita PS, Kobayashi PK, Maemondo PM. Evaluation of plasma EGFR mutation as an early predictor of response of erlotinib plus bevacizumab treatment in the NEJ026 study. EBioMedicine 2020; 57:102861. [PMID: 32629391 PMCID: PMC7334809 DOI: 10.1016/j.ebiom.2020.102861] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/24/2020] [Accepted: 06/11/2020] [Indexed: 12/26/2022] Open
Abstract
Background The NEJ026 Phase 3 study demonstrated that erlotinib and bevacizumab (BE)-treated NSCLC patients with EGFR mutations had significantly better progression-free survival (PFS) than those treated with erlotinib alone (E). This study included a prospective analysis of the relationship between the mutational status of EGFR in plasma circulating tumor DNA (ctDNA) and the efficacy of TKI monotherapy or combination therapy. We describe these results herein. Methods Plasma samples were collected from patients enrolled in NEJ026 at the start of treatment (P0), 6 weeks after the start of treatment (P1), and upon confirmation of progressive disease (P2). Plasma ctDNA was analyzed using a modified PNA-LNA PCR clamp method. PFS and OS according to EGFR status at the time of plasma collection were evaluated. Findings Plasma activating EGFR mutation (aEGFR) at P0 was detected in 68% of cases; patients without plasma aEGFR had longer PFS. The frequency of T790M mutation at P2 was similar in both arms: 8 (19.0%) in BE and 11 (20.8%) in E. Based on the aEGFR profiles, PFS was evaluated among three groups: type A [P0(-), P1(-)], type B [P0(+), P1(-)], and type C [P0(+), P1(+)]. This revealed that BE was more efficacious than E, and that BE was associated with improved PFS in all types. Interpretation Pre-treatment plasma aEGFR status have a potential of early predictor of response of TKI efficacy. Monitoring plasma aEGFR mutation will contribute to selection and continuation of treatment with BE or E. Funding Chugai Pharmaceutical.
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Affiliation(s)
| | | | - Naoki Furuya
- St. Marianna University School of Medicine, Kawasaki, Japan
| | | | | | | | | | - Ou Yamaguchi
- Saitama Medical University International Medical Center, Hidaka, Japan
| | | | | | | | | | | | | | | | - Yuka Fujita
- National Hospital Organization Asahikawa Medical Center, Asahikawa, Japan
| | - Hiromi Nagashima
- Division of Pulmonary Medicine, Allergy, and Rheumatology, Department of Internal Medicine, Iwate Medical University School of Medicine, 2-1-1, Idaidori, Yahaba-cho, Shiwa-gun, Iwate 028-3695, Japan
| | - Gyo Asai
- Okazaki City Hospital, Okazaki, Japan
| | | | | | | | | | | | | | - Prof Makoto Maemondo
- Division of Pulmonary Medicine, Allergy, and Rheumatology, Department of Internal Medicine, Iwate Medical University School of Medicine, 2-1-1, Idaidori, Yahaba-cho, Shiwa-gun, Iwate 028-3695, Japan.
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