Phase II Trial of Sorafenib in Patients with Chemotherapy Refractory Metastatic Esophageal and Gastroesophageal (GE) Junction Cancer

Yelena Y Janjigian, Efsevia Vakiani, Geoffrey Y Ku, Jessica M Herrera, Laura H Tang, Nancy Bouvier, Agnès Viale, Nicholas D Socci, Marinela Capanu, Michael Berger, David H Ilson, Yelena Y Janjigian, Efsevia Vakiani, Geoffrey Y Ku, Jessica M Herrera, Laura H Tang, Nancy Bouvier, Agnès Viale, Nicholas D Socci, Marinela Capanu, Michael Berger, David H Ilson

Abstract

Purpose: Vascular endothelial growth factor receptor (VEGFR2) directed therapies result in a modest survival benefit for patients with advanced esophageal and gastroesophageal (GE) junction cancer. Platelet-derived growth factor receptor (PDGFR) may contribute to escape from VEGFR2 inhibition. We evaluated the efficacy of sorafenib, a broad spectrum tyrosine kinase inhibitor targeting VEGFR2 and PDGFR as well as RET and RAF1, in patients with metastatic chemotherapy refractory esophageal and GE junction cancer.

Patients and methods: This phase II trial of sorafenib 400 mg twice daily enrolled chemotherapy refractory patients with metastatic esophageal and GE junction cancer with primary endpoint of progression-free survival (PFS) rate at two months. Secondary endpoints included overall survival, objective response rate and toxicity.

Results: Among 34 patients, 8 week Kaplan-Meier estimated PFS was 61% (90%CI 45 to 73%). Median PFS is 3.6 months (95% CI 1.8 to 3.9 months), with median overall survival OS 9.7 months (95% CI 5.9 to 11.6 months). Grade 3 toxicities were uncommon and included hand foot skin reaction, rash, dehydration and fatigue. One patient (3%) with ongoing complete response and remains on trial for over 5 years. Whole exome sequencing of this tumor revealed mutations in many cancer-associated genes including ARID1A, PIK3CA, and TP53, and focal amplifications of HMGA2 and MET.

Conclusion: Sorafenib therapy results in disease stabilization and encouraging PFS in patients with refractory esophageal and GE junction cancer.

Trial registration: ClinicalTrials.gov NCT00917462.

Conflict of interest statement

Competing Interests: YYJ and DHI received research funding from Bayer. This does not alter the authors' adherence to PLOS ONE policies on sharing data and materials.

Figures

Fig 1. Patient enrollment and participation flow…
Fig 1. Patient enrollment and participation flow chart.
Fig 2. Waterfall plot showing maximum percentage…
Fig 2. Waterfall plot showing maximum percentage change from baseline in size of tumors in patients who received sorafenib.
Data available for 33 patients, one patient did not have a CT due to rapid clinical deterioration. Numbers on the bars indicate months on sorafenib, the bars without numbers indicate patients who progressed on the study rapidly within

Fig 3. Kaplan-Meier Survival.

A. Kaplan-Meier curve…

Fig 3. Kaplan-Meier Survival.

A. Kaplan-Meier curve showing PFS in patients who received sorafenib. B.…

Fig 3. Kaplan-Meier Survival.
A. Kaplan-Meier curve showing PFS in patients who received sorafenib. B. Kaplan-Meier curve showing OS in patients who received sorafenib.
Fig 3. Kaplan-Meier Survival.
Fig 3. Kaplan-Meier Survival.
A. Kaplan-Meier curve showing PFS in patients who received sorafenib. B. Kaplan-Meier curve showing OS in patients who received sorafenib.

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