BeiGene, Ltd. (NASDAQ:BGNE), a commercial-stage biopharmaceutical company focused on developing and commercializing innovative molecularly targeted and immuno-oncology drugs for the treatment of cancer, today presented preliminary data from the dose-verification portion of the ongoing Phase 1/2 trial of its investigational anti-PD-1 antibody BGB-A317 in Chinese patients with advanced solid tumors at the 20th Annual Meeting of the Chinese Society of Clinical Oncology (CSCO) in Xiamen, China. The preliminary data suggest that BGB-A317 was generally well tolerated and exhibited preliminary evidence of anti-tumor activity in a Chinese study population with advanced solid tumors. BeiGene and Celgene Corporation have a global strategic collaboration for BGB-A317 for solid tumors; BeiGene retains exclusive rights to BGB-A317 in China.
BGB-A317 was generally well tolerated and showed preliminary activity in a heavily pretreated study population with advanced solid tumors. At the time of the data cut-off, no dose-limiting toxicities were observed. The pharmacokinetic profile in Chinese patients was consistent with that reported in global trials of BGB-A317 at the registrational dose, commented Professor Lin Shen of the Peking University Cancer Hospital and Beijing Institute for Cancer Research, Beijing, China, the lead author of the abstract.
This dose-verification trial is an important step as we advance BGB-A317 along Chinas domestic innovative drug development pathway. Two registrational trials of BGB-A317, in urothelial cancer and classical Hodgkin lymphoma, are currently ongoing in China. The Celgene partnership allows us to increase our investment in BGB-A317, and we intend to initiate Phase 3 trials supporting approval in China for each of the four most common tumors in the country including lung, stomach, liver, and esophageal cancers, with the initial studies expected to start in the fourth quarter of 2017 or first quarter of 2018, commented Amy Peterson, MD, Chief Medical Officer, Immuno-oncology at BeiGene.
Summary of Results from the Ongoing Phase 1/2 Trial
The multi-center Phase 1/2 trial of BGB-A317 consists of a Phase 1 dose-verification portion and a Phase 2 portion of indication expansion in disease-specific cohorts. Data presented at CSCO include patients enrolled in the Phase 1 portion of this study, who received BGB-A317 at 200 mg once every three weeks (Q3W).
As of June 16, 2017, 20 patients had enrolled in the trial. The median duration of therapy in these patients was 53 days (range 21171 days).
Adverse events (AEs) assessed by the investigator to be related to treatment occurred in 19 patients (95%). The most common treatment-related AEs (TRAEs) were related to changes in clinical laboratory value; TRAEs occurring in 15% or more of patients included increased blood bilirubin (45%), anemia (35%), proteinuria (30%), increased aspartate transferase (AST) (25%), increased alanine transferase (ALT) (20%), leukopenia (15%), neutropenia (15%), pyrexia (15%), and vomiting (15%). All of the TRAE cases were grades 1 or 2 except for one case each of grade 3 increased blood bilirubin, leukopenia, and neutropenia. Increased AST (25%) and ALT (20%) were the most common AEs that were potentially immune related.
At the time of the data cutoff, 11 patients had at least one post-baseline imaging assessment, and three patients had at least two imaging assessments. The efficacy-evaluable population (measurable disease at baseline and at least one post-baseline tumor assessment, or progression or death) consisted of 12 patients, including three patients with microsatellite-instability-high (MSI-high) colorectal cancer (CRC), two patients with gastric cancer (GC), two patients with hepatocellular carcinoma (HCC), two patients with urothelial cancer (UC), two patients with melanoma, and one patient with gastrointestinal stromal tumor (GIST). Partial responses (PR) were observed in one patient with UC (confirmed) and one with GC (unconfirmed). Stable disease was observed in two patients with melanoma and one with MSI-high CRC. In the remaining eight patients who were not evaluable as of the data cutoff, a third unconfirmed PR was observed in a patient with esophageal cancer 11 days after the data cutoff. At the time of the data cutoff, 15 patients remained on treatment.
BGB-A317 is an investigational humanized monoclonal antibody that belongs to a class of immuno-oncology agents known as immune checkpoint inhibitors. It is designed to bind to PD-1, a cell surface receptor that plays an important role in downregulating the immune system by preventing the activation of T-cells. BGB-A317 has high affinity and specificity for PD-1. It is differentiated from the currently approved PD-1 antibodies in an engineered Fc region, which is believed to minimize potentially negative interactions with other immune cells. BGB-A317 is being developed as a monotherapy and in combination with other therapies for the treatment of a broad array of both solid tumor and hematologic cancers. BeiGene and Celgene Corporation have a global strategic collaboration for BGB-A317 for solid tumors.
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