Abstract 4210
Background
Gastrointestinal stromal tumors (GISTs) patients (pts) who develop resistance to imatinib and sunitinib have few therapeutic options. Apatinib is a multiple tyrosine kinase inhibitor and targetsVEGFR2, PDGFRβ and c-Kit, which is effective in several solid tumors. We aimed to assess the efficacy and safety of apatinib in pts with advanced GISTs who failed previous standard tyrosine kinase inhibitors.
Methods
In this single-arm, open-label, phase II study, we enrolled pts (aged ≥18 years) with advanced GISTs resistant to imatinib and sunitinib from 3 comprehensive cancer centers or university hospitals in China and assigned them to 500 mg oral apatinib once daily in 4-week cycles. Pts were assessed for response by RECIST 1.1 every 2 cycles. The primary endpoint was investigator-assessed progression-free survival. The secondary endpoints included response rate, overall survival and advent events.
Results
Between September 2017 and February 2019, 10 pts were enrolled (7 evaluable for response), and pts are still being accrued to the trial. Here we present the preplanned early analysis of clinical outcomes. The median follow-up was 16.6 months. Four pts reached stable disease. The median PFS was 5.4 months (95% CI 2.0–9.8), and the 4-month PFS rate was 57.1%. Drug-related adverse events were reported in 9 (90%) pts and the most common apatinib-related adverse events of grade 3 or higher were hypertension (3 of 10, 30%), hand-foot skin reaction (4 of 10, 40%), fatigue (5 of 10, 50%) and proteinuria (2 of 10, 20%). There was no treatment-related death.
Conclusions
Apatinib appears to have promising anti-tumor activity and an acceptable toxicity profile in pts with advanced GISTs previously treated with imatinib and sunitinib. Apatinib warrants further investigation in GISTs.
Clinical trial identification
ChiCTR1800020407.
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Chinese Society of Clinical Oncology.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
5823 - Pulmonary tumor-draining vein exosomal lincRNA-p21 levels impacts non-small cell lung cancer prognosis
Presenter: Joan Castellano
Session: Poster Display session 1
Resources:
Abstract
1842 - Immunological impact of surgery in NSCLC patients
Presenter: Akitoshi Yanagihara
Session: Poster Display session 1
Resources:
Abstract
4124 - The prognostic value of selected immunological panel in predicting the prognosis of early-stage resectable non-small cell lung cancer
Presenter: Sha Zhao
Session: Poster Display session 1
Resources:
Abstract
4468 - Genomic Heterogeneity and Clonality Analysis of Multiple synchronous lung cancers (MSLCs)
Presenter: Fachen Zhou
Session: Poster Display session 1
Resources:
Abstract
5547 - Analysis of immunosuppressive factors produced by tumorspheres in NSCLC. Prognostic value of Galectin-3 in adenocarcinoma
Presenter: Susana Torres Martinez
Session: Poster Display session 1
Resources:
Abstract
1658 - Frequency of epidermal growth factor receptor (EGFR) mutations in stage IB–IIIA EGFR mutation positive non-small-cell lung cancer (NSCLC) after complete tumour resection
Presenter: Masahiro Tsuboi
Session: Poster Display session 1
Resources:
Abstract
1535 - EGFR mutation is not a prognostic factor in completely resected lymph node–negative pulmonary adenocarcinoma (LNNPA)
Presenter: Nussara Leeladejkul
Session: Poster Display session 1
Resources:
Abstract
3262 - Prognostic significance of elements of the adaptive immunity in the microenvironment of early-stage non small cell lung cancer
Presenter: Aliki Liakea
Session: Poster Display session 1
Resources:
Abstract
4643 - Combined immunoscore for prognostic stratification of early stage NSCLC patients
Presenter: Giulia Pasello
Session: Poster Display session 1
Resources:
Abstract
4819 - Radiation-induced lung injury and misdiagnosis rate after SBRT
Presenter: Xiaolong Fu
Session: Poster Display session 1
Resources:
Abstract