On March 13, 2023 Bio-Thera Solutions, Ltd. (SH: 688177), a commercial-stage pharmaceutical company, reported that dosing has begun in a Phase 1 clinical study evaluating BAT8007, an antibody-drug conjugate (ADC) that targets Nectin-4 (Press release, BioThera Solutions, MAR 13, 2023, View Source [SID1234628605]). The multicenter, open-label Phase 1 clinical study in patients with advanced solid tumors aims to evaluate the safety and tolerability of BAT8007. Key objectives of the study are to determine the maximum tolerated dose (MTD), recommended Phase 2 dose (RP2D), and to evaluate the pharmacokinetics and preliminary efficacy in patients with advanced solid tumors.
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BAT8007 is an antibody-drug conjugate (ADC) targeting Nectin-4 designed for the treatment of solid tumors. Nectin-4 (Nectin cell adhesion molecule 4) belongs to the nectin subfamily of immunoglobulin-like adhesion molecules that participate in Ca(2+)-independent cell-cell adhesion. Nectin-4 has high expression levels in a normal embryo and fetal tissues, while those expression levels decline in adulthood and has limited distribution in healthy tissues.
Nectin-4 is overexpressed in a variety of solid tumors, such as urothelial carcinoma, breast cancer, non-small cell lung cancer, pancreatic cancer, esophageal cancer and head and neck cancer, etc. High expression levels of Nectin-4 in tumors is associated with poor prognosis for patients. Nectin-4 is a validated drug target with one approved drug for the treatment of solid tumors and is a target of high interest for new drug discovery.
BAT8007 was developed by using Bio-Thera’s proprietary ADC linker-payload that includes a cleavable but systemically stable linker, a small molecule topoisomerase I inhibitor and high DAR. The small molecule topoisomerase I inhibitor payload carried by BAT8007 has a strong cell membrane penetration ability. Consequently, when targeted cancer cells are killed, the payload has shown to be released and kill nearby cancer cells, producing a bystander effect, which has the potential to overcome the heterogeneity of the tumor. BAT8007 has demonstrated high anti-tumor activity, good stability, and safety in both in vitro and in vivo pharmacological studies.
Bio-Thera Solutions is developing four other ADCs based on its proprietary linker-payload, including ADCs targeting FRα, B7H3, Her2, Trop2. All of the ADCs in Bio-Thera’s pipeline are currently in early-stage clinical studies.