Ambrx Biopharma Inc., a clinical-stage biologics company, discovers and develops engineered precision biologics using its proprietary expanded genetic code technology platform. Its lead product candidate is ARX788, an anti-HER2 antibody-drug conjugate (ADC), which is investigated in various clinical trials for the treatment of breast cancer, gastric/gastroesophageal junction cancer, and other solid tumors, including ongoing Phase 2/3 clinical trials for the treatment of HER2-positive metastatic breast cancer and gastric cancer. The company is also developing two earlier-stage product candidates, including ARX517, an anti-PSMA ADC, which is in a Phase 1 clinical trial for the treatment of prostate cancer and other solid tumors, and ARX305, an anti-CD70 ADC in investigational new drug-enabling studies for the treatment of renal cell carcinoma and other cancers. In addition, it is developing other multiple product candidates targeting immuno-oncology applications, which include ARX822, a fab-small molecule bispecific that is in preclinical development for cancers, and ARX102, an immuno-oncology IL-2 pathway agonist to stimulate the patient's own immune system by targeting the ß and gamma receptors on the cytotoxic T cell. Ambrx Biopharma Inc. has collaborations with Bristol Myers Squibb Company, AbbVie Inc., BeiGene, Sino Biopharmaceutical Co., Ltd., NovoCodex, and Elanco Animal Health. The company was incorporated in 2003 and is headquartered in La Jolla, California.