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
5939 - Matrix metalloproteinases and their tissue inhibitors genes abnormal DNA methylation in breast cancer
Presenter: Olga Simonova
Session: Poster Display session 1
Resources:
Abstract
2703 - Uveal melanoma cell lines depend on multiple signaling pathways for survival
Presenter: John Park
Session: Poster Display session 1
Resources:
Abstract
4849 - XAF1 and ZNF313 complex stimulates ER stress-induced apoptosis via direct GRP78 inhibition.
Presenter: Sungchan Jang
Session: Poster Display session 1
Resources:
Abstract
4801 - XAF1 assembles a destructive complex to induce BRCA1-mediated apoptosis via suppressing ERa and switching estrogen function
Presenter: Seung-hun Jang
Session: Poster Display session 1
Resources:
Abstract
3416 - Cancer associated fibroblasts promote cancer progression via Wnt2 secretion in colorectal cancer
Presenter: Hideaki Karasawa
Session: Poster Display session 1
Resources:
Abstract
4273 - Paired-related homeobox 1 overexpression promotes invasion and metastasis and is a prognostic factor for worse disease-free survival in patients with lung cancer
Presenter: Jung-jyh Hung
Session: Poster Display session 1
Resources:
Abstract
4241 - LncRNA-GC1 contributes to gastric cancer chemo-resistance through inhibition of miR-551b-3p and the overexpression of dysbindin
Presenter: Xin Guo
Session: Poster Display session 1
Resources:
Abstract
5388 - GLPG 1790, a new selective EPHA2 inhibitor, is active in colorectal cancer cell lines belonging to the CMS4/mesenchymal-like subtype
Presenter: Pietro Paolo Vitiello
Session: Poster Display session 1
Resources:
Abstract
5208 - Characterisation of growth hormone signal transduction in primary melanoma cell lines
Presenter: Karla Sousa
Session: Poster Display session 1
Resources:
Abstract
3156 - LAPTM5 protein can regulate TGF-β mediated MAPK and Smad signaling pathways in ovarian cancer cell
Presenter: Yan Gao
Session: Poster Display session 1
Resources:
Abstract