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Pembrolizumab alone or in combination with chemotherapy as first-line therapy for patients with advanced gastric or gastroesophageal junction adenocarcinoma: results from the phase II nonrandomized KEYNOTE-059 study

 Yung-Jue Bang  ;  Yoon-Koo Kang  ;  Daniel V. Catenacci  ;  Kei Muro  ;  Charles S. Fuchs  ;  Ravit Geva  ;  Hiroki Hara  ;  Talia Golan  ;  Marcelo Garrido  ;  Shadia I. Jalal  ;  Christophe Borg  ;  Toshihiko Doi  ;  Harry H. Yoon  ;  Mary J. Savage  ;  Jiangdian Wang  ;  Rita P. Dalal  ;  Sukrut Shah  ;  Zev A. Wainberg  ;  Hyun Cheol Chung 
 Gastric Cancer, Vol.22(4) : 828-837, 2019 
Journal Title
 Gastric Cancer 
Issue Date
5-Fluorouracil ; Capecitabine ; Cisplatin ; Gastric cancer ; Pembrolizumab
BACKGROUND: The multicohort, phase II, nonrandomized KEYNOTE-059 study evaluated pembrolizumab ± chemotherapy in advanced gastric/gastroesophageal junction cancer. Results from cohorts 2 and 3, evaluating first-line therapy, are presented. METHODS: Patients ≥ 18 years old had previously untreated recurrent or metastatic gastric/gastroesophageal junction adenocarcinoma. Cohort 3 (monotherapy) had programmed death receptor 1 combined positive score ≥ 1. Cohort 2 (combination therapy) received pembrolizumab 200 mg on day 1, cisplatin 80 mg/m2 on day 1 (up to 6 cycles), and 5-fluorouracil 800 mg/m2 on days 1-5 of each 3-week cycle (or capecitabine 1000 mg/m2 twice daily in Japan). Primary end points were safety (combination therapy) and objective response rate per Response Evaluation Criteria in Solid Tumors version 1.1 by central review, and safety (monotherapy). RESULTS: In the combination therapy and monotherapy cohorts, 25 and 31 patients were enrolled; median follow-up was 13.8 months (range 1.8-24.1) and 17.5 months (range 1.7-20.7), respectively. In the combination therapy cohort, grade 3/4 treatment-related adverse events occurred in 19 patients (76.0%); none were fatal. In the monotherapy cohort, grade 3-5 treatment-related adverse events occurred in seven patients (22.6%); one death was attributed to a treatment-related adverse event (pneumonitis). The objective response rate was 60.0% [95% confidence interval (CI), 38.7-78.9] (combination therapy) and 25.8% (95% CI 11.9-44.6) (monotherapy). CONCLUSIONS: Pembrolizumab demonstrated antitumor activity and was well tolerated as monotherapy and in combination with chemotherapy in patients with previously untreated advanced gastric/gastroesophageal junction adenocarcinoma. CLINICAL TRIAL: ClinicalTrials.gov NCT02335411.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Chung, Hyun Cheol(정현철) ORCID logo https://orcid.org/0000-0002-0920-9471
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