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
3690 - PD-L1 expression in resected undifferentiated pleomorphic sarcoma and its clinical implications
Presenter: Kyoungmin Lee
Session: Poster Display session 1
Resources:
Abstract
2013 - PD-L1 expression as a potential therapeutic target and prognostic biomarker in well-differentiated and dedifferentiated liposarcoma.
Presenter: Heejung Chae
Session: Poster Display session 1
Resources:
Abstract
5021 - Soft tissue sarcomas express a distinct mRNA immune profile
Presenter: Viktor Grünwald
Session: Poster Display session 1
Resources:
Abstract
3029 - The molecular landscape of fusion genes in endometrial stromal sarcomas include three nosological entities with different natural history
Presenter: Mehdi Brahmi
Session: Poster Display session 1
Resources:
Abstract
3914 - Clinical validation of a novel assay for the detection of diagnostic alterations in sarcomas
Presenter: Lauren Mc Connell
Session: Poster Display session 1
Resources:
Abstract
1912 - A prospective correlative trial of personalized patient-derived xenograft (PDX) as avatars for drug therapy in patients with metastatic or recurrent soft tissue sarcomas (STS).
Presenter: Kanan Alshammari
Session: Poster Display session 1
Resources:
Abstract
5097 - Fusion of immortalized myoblasts induces genomic instability that drives tumor development and progression.
Presenter: Candice Merle
Session: Poster Display session 1
Resources:
Abstract
1383 - let-7a suppress Ewing sarcoma CSCs' malignant phenotype through forms a positive feedback regulation loop with lin28 via STAT3
Presenter: Xu Jiang
Session: Poster Display session 1
Resources:
Abstract
3386 - Myoepithelial Tumors of Soft Tissues and Extraskeletal Myxoid Chondrosarcomas feature a distinct transcriptional pattern
Presenter: Dominga Racanelli
Session: Poster Display session 1
Resources:
Abstract
1844 - In Vivo Efficacy and Enhanced Tumor Accumulation of Liposomal Vinorelbine (TLC178) in Human Sarcoma Xenograft Mice Model
Presenter: Wan-ni Yu
Session: Poster Display session 1
Resources:
Abstract