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Research ArticleClinical Studies

Phase I Study Evaluating the Combination of Afatinib with Carboplatin and Pemetrexed After First-line EGFR-TKIs

SATOSHI WATANABE, OU YAMAGUCHI, AI MASUMOTO, YURI MAENO, YOSUKE KAWASHIMA, OSAMU ISHIMOTO, SHUNICHI SUGAWARA, HIROHISA YOSHIZAWA, TOSHIAKI KIKUCHI, TOSHIHIRO NUKIWA and KUNIHIKO KOBAYASHI
Anticancer Research August 2018, 38 (8) 4699-4704; DOI: https://doi.org/10.21873/anticanres.12776
SATOSHI WATANABE
1Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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OU YAMAGUCHI
2Respiratory Medicine, Saitama Medical University International Medical Center, Saitama, Japan
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AI MASUMOTO
2Respiratory Medicine, Saitama Medical University International Medical Center, Saitama, Japan
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YURI MAENO
2Respiratory Medicine, Saitama Medical University International Medical Center, Saitama, Japan
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YOSUKE KAWASHIMA
3Department of Pulmonary Medicine, Sendai Kousei Hospital, Sendai, Japan
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OSAMU ISHIMOTO
3Department of Pulmonary Medicine, Sendai Kousei Hospital, Sendai, Japan
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SHUNICHI SUGAWARA
3Department of Pulmonary Medicine, Sendai Kousei Hospital, Sendai, Japan
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HIROHISA YOSHIZAWA
1Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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TOSHIAKI KIKUCHI
1Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
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TOSHIHIRO NUKIWA
4Japan Anti-Tuberculosis Association, Tokyo, Japan
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KUNIHIKO KOBAYASHI
2Respiratory Medicine, Saitama Medical University International Medical Center, Saitama, Japan
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  • For correspondence: kobakuni@saitama-med.ac.jp
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Abstract

Background/Aim: Promising reports have described the combination of first-generation epidermal growth factor receptor tyrosine-kinase inhibitors (EGFR-TKIs) with carboplatin plus pemetrexed or bevacizumab. However, no analysis of afatinib with platinum-doublet chemotherapies has been performed. Patients and Methods: We evaluated the safety and antitumor efficacy of afatinib combined with carboplatin and pemetrexed in EGFR-mutated non-small-cell lung cancer (NSCLC) patients who progressed during first-generation EGFR-TKIs. Results: Ten patients received 20 or 30 mg/day afatinib with carboplatin (area under the curve, 5) and pemetrexed (500 mg/m2). Dose-limiting toxicities included delay of afatinib ≥14 days, grade 3 diarrhea, grade 3 hypokalemia, grade 3 serum amylase increase and grade 4 thrombocytopenia. The recommended dose of afatinib was 20 mg/day in this combination therapy. Overall response rate was 30% and median progression-free survival was 13.7 months. Conclusion: This is the first study to investigate the combination of afatinib, carboplatin and pemetrexed. At the recommended dose, this combination was well tolerated and had a good clinical efficacy.

  • Afatinib
  • carboplatin
  • pemetrexed
  • EGFR mutation
  • non-small-cell lung cancer

Epidermal growth factor receptor (EGFR) tyrosine-kinase inhibitors (TKIs) have shown improvements in progression-free survival (PFS) and response rates compared to platinum-doublet therapy in EGFR-mutation-positive non-small-cell lung cancer (NSCLC) (1-6). Despite the excellent efficacy of EGFR-TKIs in EGFR-mutation-positive NSCLC, almost all patients experience resistance to EGFR-TKIs. Osimertinib therapy for relapsed patients with the T790M mutation after 1st and 2nd generation EGFR-TKI (gefitinib, erlotinib and afatinib) treatments has been established, but no standard therapies have been developed for NSCLC patients without T790M after failure of first-line EGFR-TKIs.

Previous studies reported that even when NSCLC patients with EGFR mutations showed radiographic disease progression during EGFR-TKI therapy, NSCLC remained sensitive to EGFR-TKIs (7). Riely et al. demonstrated that NSCLC showed significant proliferation after discontinuation of EGFR-TKIs using positron emission tomography imaging (8). Additionally, Chaft et al. reported that some patients who had developed acquired resistance to EGFR-TKI treatments showed rapid disease progression when EGFR-TKI administration was stopped (9). These findings indicate that there is a heterogeneous mixture of TKI-sensitive and TKI-resistant lung cancer cells in EGFR-mutated patients with disease progression while on EGFR-TKI therapy. Indeed, continuation of gefitinib beyond disease progression has shown favorable results (10-12). The addition of cytotoxic agents to EGFR-TKI therapy in patients who had benefited from initial EGFR-TKI treatment appears to be a promising approach because EGFR-TKI inhibits TKI-sensitive cancer cells and cytotoxic chemotherapy can target EGFR-TKI-resistant cells.

Afatinib is a second-generation, irreversible EGFR-TKI. In a phase I/II study, afatinib showed antitumor effects in EGFR-mutated NSCLC patients previously treated with first-generation EGFR-TKIs. The results from large randomized phase II and phase III studies have indicated that afatinib has better antitumor activities than gefitinib (5, 6, 13). We previously reported that the combination of gefitinib, carboplatin and pemetrexed had promising antitumor effects for patients with EGFR-mutations in a first-line setting (14). Our randomized phase III study demonstrated that the combination of gefitinib, carboplatin and pemetrexed significantly prolonged overall survival (OS) compared to gefitinib monotherapy (52.2 months vs. 38.8 months, p=0.013) (15). These findings indicate that the combination of afatinib, carboplatin and pemetrexed might improve clinical outcomes for NSCLC patients with EGFR-mutations after failure of first-line EGFR-TKI treatment. Furthermore, afatinib and the combination of carboplatin and pemetrexed did not share mechanisms of inhibition in lung cancer cells and did not have similar profiles of adverse events. Also, there have been no reports describing afatinib combined with platinum-doublet chemotherapy in lung cancer patients.

Here a phase I study was conducted to evaluate the safety, tolerability and antitumor efficacy of the combination treatment of afatinib, carboplatin and pemetrexed in EGFR-mutated NSCLC patients who showed disease progression during first-generation EGFR-TKI treatment.

Patients and Methods

Patient selection. Patients were 20-75 years old at the time of provision of informed consent, had an Eastern Cooperative Oncology Group Scale of performance status (PS) of 0 to 1, had measurable disease according to Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1, and had a life expectancy of at least 3 months (16). Eligible criteria also included a confirmed histological or cytological diagnosis of non-squamous NSCLC that was treated with gefitinib or erlotinib as the first-line treatment and then showed disease progression, common activating EGFR mutations (exon 19 deletion or L858R), either postoperative recurrence or stage IIIB or IV, and adequate major organ function. Patients who had previously received afatinib or cytotoxic chemotherapy for advanced disease, had symptomatic brain metastases and had pulmonary fibrosis or interstitial-lung disease were excluded.

All patients provided written informed consent. The study was conducted in accordance with the Helsinki Declaration of the World Medical Association. The protocol was approved by the institutional review board of each participating institution. This trial was registered at the University Hospital Medical Information Network Clinical Trial Registry (UMIN 000015582).

Study design and treatment procedure. This was a multicenter phase I study across institutions belonging to the North East Japan Study Group. In a 3+3 dose escalation design, patients were treated with carboplatin (area under the curve [AUC]=5) and pemetrexed (500 mg/m2) on day 1 of a 21-day cycle. Afatinib was given on days 8 to 18 and escalated from 20 to 40 mg/day. After 4 to 6 cycles of the combination treatment of the three-drug regimen, 500 mg/m2 pemetrexed on day 1 and afatinib administration on days 8 to 18 every 21 days were continued for maintenance.

Patients received folic acid and vitamin B12 at least 7 days before the start of the first cycle, and these treatments continued to be administered every day and every 9 weeks, respectively. When carboplatin and pemetrexed were administered on day 1, the patient must have been afebrile and have PS 0-2, grade 1 or less neutropenia, thrombocytes ≥100,000/μl, creatinine ≤1.5 mg/dl, and both aspartate aminotransferase and alanine aminotransferase ≤3 times the upper limits of normal. Afatinib administration was delayed in the presence of toxicities, such as PS ≤3, neutropenia grade ≥3, thrombocytopenia <75,000/μl, diarrhea grade ≥2 or non-hematological toxicities ≥3. Prophylactic administration of loperamide was allowed.

Carboplatin and/or pemetrexed dose reductions were performed in each subsequent cycle in the event of severe toxicities in the previous cycle, including thrombocytopenia <25,000/μl, febrile neutropenia, grade ≥2 sensory neuropathy or other grade ≥3 non-hematological toxicities. A dose reduction comprised a decrease in carboplatin dosing to an AUC of 4 mg/ml/min and a decrease in pemetrexed to 400 mg/m2. Subsequent dose increases were not allowed after a reduction in the chemotherapy dose.

Definition of dose-limiting toxicity (DLT) and maximum-tolerated dose (MTD). All toxicities were graded using Common Terminology Criteria for Adverse Events version 4.0. A dose-limiting toxicity (DLT) was defined as grade 4 thrombocytopenia, grade 4 neutropenia if longer than 7 days, febrile neutropenia, grade 3 or 4 non-hematologic toxicity, diarrhea grade ≥2 for more than 4 days despite supportive care, nausea and/or vomiting grade ≥2 for ≥7 days, cardiac left ventricular function grade ≥2, delay of next treatment cycle ≥21 days, and delay of afatinib treatment ≥14 days.

The primary endpoint of this study was to determine the maximum-tolerated dose (MTD) and recommended dose (RD) of afatinib in combination with pemetrexed and carboplatin. Cohort expansion to six patients was required if one DLT was observed in the first three patients, and dose escalation would be stopped if more than half of the patients experienced DLTs. The MTD was defined as the lowest dose at which ≥ three of six patients experienced DLT during the first cycle.

Antitumor activities. Tumor response was assessed according to RECIST version 1.1 and classified as complete response (CR), partial response (PR), stable disease (SD) and progressive disease (PD) by an extramural review process. PFS was defined as the time from registration to the date of initial disease progression or death, whichever occurred first, and PFS data were estimated using Kaplan–Meier methodology. OS was defined as the time from registration to death from any cause.

Results

Patient characteristics. Between November 2014 and June 2016, 11 patients were enrolled: 3 patients at dose level 1 (afatinib at 20 mg/day, pemetrexed and carboplatin) and 8 patients at dose level 2 (afatinib at 30 mg/day, pemetrexed and carboplatin). Because one patient did not receive the protocol therapy due to severe infection at dose level 2, safety and efficacy were assessed in 10 total patients (Table I). Tumor genotyping revealed that 8 patients had exon 19 deletions, and 2 patients had L858R. Seven patients had previously received gefitinib, and 3 had received erlotinib as the first-line treatment. All patients had benefitted from prior EGFR-TKIs.

Safety and MTD. All 10 patients experienced an adverse event (AE) in all treatment courses, with leukocytopenia and neutropenia being the most frequently reported (Table II). Diarrhea occurred in 4 patients at all dose levels, especially in the first cycle; however, only one patient had grade 3 diarrhea. Because no DLTs were observed in the 3 patients at dose level 1, escalation to dose level 2 was performed. One of the first three patients at dose level 2 experienced DLT with grade 3 diarrhea (Table III), and, therefore, an additional cohort was treated with the same dose level. One patient of an additional cohort did not receive afatinib due to grade 3 neutropenia during the first treatment cycle. Because recovery from neutropenia was delayed, this patient was not given afatinib in the first cycle. But in subsequent cycle under leukopenia induced by carboplatin and pemetrexed, the patient was treated by afatinib without any severe side effects. The independent data monitoring committee (IDMC) of the study then decided to remove the administration delay criteria of afatinib in the presence of neutropenia, which was approved by each IRB. IDMC also decided to collect a total of 7 patients in level 2. Two of the additional 4 patients experienced DLTs with grade 4 thrombocytopenia, grade 3 hypokalemia and grade 3 serum amylase increase. Three out of the 6 patients excluding the above patient experienced DLTs. Even in an intent-to-treat population, 4 out of 7 patients at level 2 developed DLTs. Thus, we determined that dose level 2 was the MTD, and dose level 1 with no DLTs was recommended for phase II trials. Median dose intensity, which was the actual dose delivered as a proportion of the planned dose, was 88% at level 1 and 73% at level 2.

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Table I.

Demographic and baseline characteristics.

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Table II.

Adverse events in all treatment cycles.

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Table III.

Summary of DLTs.

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Table IV.

Best response to treatment.

Figure 1.
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Figure 1.

Waterfall plot of the best percentage change of individual patients by the doses of afatinib. *The tumor response was ongoing at the data cutoff in the patient.

Antitumor activities. The median number of cycles administered was 5 (range=1-19 cycles). The best confirmed response was CR in one patient, PR in 2 patients and SD in 7 patients of the 10 patients evaluable for radiographic response (Table IV). Notably, the disease-control rate (DCR=CR+PR+SD) was 100%, and no patients showed PD. Tumor shrinkages were observed in all patients except one, and as of September 2017, response was still ongoing in one patient (Figure 1). At the cut-off date for data collection, the median follow-up time was 22.5 months (range=11-30 months). The median PFS was 13.7 months (95% confidence interval=4-18.2), and 1-year survival was 100% (Figure 2). Of the 10 patients, only 2 patients died before data cutoff.

Discussion

The promising antitumor efficacies of the combination of gefitinib, carboplatin and pemetrexed have been described in EGFR-mutated NSCLC patients (14). In addition, our randomized phase III study demonstrated that the combination of gefitinib, carboplatin and pemetrexed significantly prolonged OS compared to gefitinib monotherapy (52.2 months vs. 38.8 months, p=0.013) (15). This study investigated the safety and efficacy of the combination of afatinib, carboplatin and pemetrexed in EGFR-mutated NSCLC patients who received first-generation EGFR-TKIs and showed disease progression. Although AEs frequently observed in afatinib treatment do not overlap with AEs observed in the combination of carboplatin and pemetrexed, we expected that gastrointestinal toxicities, especially appetite loss, nausea and vomiting, would be enhanced by co-administration of afatinib, carboplatin and pemetrexed. Gastrointestinal toxicities are predominantly observed in the 7 days after the start of platinum-doublet therapy. In addition, the half-life of afatinib was 34 to 40 h in Japanese patients. To avoid the enhancement of gastrointestinal toxicities by the combination of afatinib, carboplatin and pemetrexed, we administered afatinib on days 8 to 18. In this combination therapy, the most common treatment-related AEs included neutropenia, thrombocytopenia, appetite loss and diarrhea. These events were manageable with standard supportive therapies. The MTD of afatinib in this combination was 30 mg/day. Thus, 20 mg/day afatinib (on days 8 to 18) with carboplatin (AUC=5) and pemetrexed (500 mg/m2) was determined as the RD for a phase II trial.

Figure 2.
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Figure 2.

Kaplan–Meier analysis of progression-free survival.

Post hoc analyses of the randomized studies revealed that dose reduction occurred in 53.3% and 28% of patients in the LUX-Lung 3 and 6 trials respectively (17). Subgroup analysis of LUX-Lung 3 showed that Japanese patients were more likely to have an AE leading to dose reduction. Indeed, 23 out of 54 Japanese patients needed a dose reduction to 20 mg/day in LUX-Lung 3 (18). Importantly, these studies showed that the dose reduction of afatinib did not decrease the antitumor effects of afatinib (17, 18). In the current study, 30 mg/day afatinib combined with carboplatin and pemetrexed was not tolerated, and the RD of afatinib was determined to be 20 mg/day. Although no conclusions can be drawn from this phase I trial, the available data suggested that this combination therapy had good antitumor effects. Long PFS and OS were observed, and all patients except one showed a decrease in tumor size. Similar to the previous findings, good clinical responses were observed at these dose levels in our study.

A randomized phase III trial demonstrated that osimertinib had greater antitumor effects than platinum-doublet therapy in NSCLC patients with the EGFR T790M mutation after failure of first-line EGFR-TKIs (19). In clinical practice, platinum-doublet treatment with/without bevacizumab is administered to patients without the T790M mutation; however, prognosis of these patients is poor, and new treatment strategies are needed. Continuation of gefitinib with the combination of cisplatin and pemetrexed was investigated in patients with EGFR-mutations after the failure of gefitinib (20). Although this combination therapy failed to improve the overall survival, subgroup analyses demonstrated a longer PFS in patients without the T790M mutation (21). Afatinib previously showed some antitumor effects in NSCLC patients who progressed during prior gefitinib and/or erlotinib treatment (22). This study included both EGFR T790M positive and negative patients. These findings might possibly explain the high DCR and long PFS of the combination of afatinib, carboplatin and pemetrexed in the current study. We did not examine the EGFR T790M mutation status because tests for T790M were not covered by the national health insurance in Japan when patients were enrolled. Future studies are necessary to clarify the relationship between the T790M status and the antitumor effects of the combination of afatinib, carboplatin and pemetrexed after failure of first-line EGFR-TKI treatment.

Conclusion

This phase I study established the safety and tolerability of the combination of afatinib, carboplatin and pemetrexed with promising clinical efficacy. To the best of our knowledge, this is the first study to assess afatinib combined with platinum-doublet chemotherapy. Further evaluation of this combination therapy in EGFR-mutated NSCLC patients after failure of first-line EGFR-TKIs, especially in patients without the EGFR T790M mutation, is warranted.

Acknowledgements

The Authors are grateful to the patients and their families and the investigators, nurses, and staff members who participated in the current study. The study was funded by Boehringer Ingelheim. The collection of data used in this analysis was supported by the Tokyo Cooperative Oncology Group. All Authors made the final decision to submit the report for publication. The corresponding Author had full access to all the data in the study and had final responsibility for the decision to submit for publication.

Footnotes

  • This article is freely accessible online.

  • Conflicts of Interest

    SW reports grants from Boehringer Ingelheim, during the conduct of the study; grants and personal fees from Boehringer Ingelheim, personal fees from Chugai Pharma, Ono Pharmaceutical, Lilly, AstraZeneca, Taiho Pharmaceutical, Pfizer, Bristol-Myers Squibb and Novartis Pharma. OY reports grants and personal fees from Boehringer Ingelheim, during the conduct of the study; personal fees from Ono Pharmaceutical, Bristol-Myers Squibb and AstraZeneca. AM reports grants from Boehringer Ingelheim, during the conduct of the study. YM reports grants from Boehringer Ingelheim, during the conduct of the study. YK reports grants from Boehringer Ingelheim, during the conduct of the study. OI reports grants from Boehringer Ingelheim, during the conduct of the study. SS reports grants and personal fees from Boehringer Ingelheim, during the conduct of the study; personal fees from AstraZeneca, Chugai Pharma, Pfizer, Taiho Pharmaceutical, Lilly, Novartis Pharma, Kyowa Hakko Kirin, Bristol-Myers Squibb, Ono Pharmaceutical and MSD. HY reports grants from Boehringer Ingelheim, during the conduct of the study; personal fees from Novartis Pharma, AstraZeneca, Taiho Pharmaceutical, Pfizer, MSD and SHIONOGI & CO., LTD. TK reports grants from Boehringer Ingelheim, during the conduct of the study; grants from Taiho Pharmaceutical, Chugai Pharma, Lilly and MSD. TN reports grants from Boehringer Ingelheim, during the conduct of the study. KK reports grants from Boehringer Ingelheim, during the conduct of the study; personal fees from Boehringer Ingelheim, Chugai Pharma, Ono Pharmaceutical, Lilly, AstraZeneca and Bristol-Myers Squibb.

  • Received June 20, 2018.
  • Revision received June 27, 2018.
  • Accepted June 29, 2018.
  • Copyright© 2018, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 38 (8)
Anticancer Research
Vol. 38, Issue 8
August 2018
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Phase I Study Evaluating the Combination of Afatinib with Carboplatin and Pemetrexed After First-line EGFR-TKIs
SATOSHI WATANABE, OU YAMAGUCHI, AI MASUMOTO, YURI MAENO, YOSUKE KAWASHIMA, OSAMU ISHIMOTO, SHUNICHI SUGAWARA, HIROHISA YOSHIZAWA, TOSHIAKI KIKUCHI, TOSHIHIRO NUKIWA, KUNIHIKO KOBAYASHI
Anticancer Research Aug 2018, 38 (8) 4699-4704; DOI: 10.21873/anticanres.12776

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Phase I Study Evaluating the Combination of Afatinib with Carboplatin and Pemetrexed After First-line EGFR-TKIs
SATOSHI WATANABE, OU YAMAGUCHI, AI MASUMOTO, YURI MAENO, YOSUKE KAWASHIMA, OSAMU ISHIMOTO, SHUNICHI SUGAWARA, HIROHISA YOSHIZAWA, TOSHIAKI KIKUCHI, TOSHIHIRO NUKIWA, KUNIHIKO KOBAYASHI
Anticancer Research Aug 2018, 38 (8) 4699-4704; DOI: 10.21873/anticanres.12776
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Keywords

  • afatinib
  • Carboplatin
  • pemetrexed
  • EGFR mutation
  • non-small-cell lung cancer
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