Ambrx Biopharma Inc., a clinical-stage biologics company, focuses on discovering and developing 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, as well as other multiple product candidates targeting immuno-oncology applications. In addition, it is developing 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; and ARX822, a fab-small molecule bispecific that is in preclinical development for cancers. Ambrx Biopharma Inc. has collaborations with various pharmaceutical companies, which include Bristol Myers Squibb Company; AbbVie Inc.; Astellas Pharma Inc.; and Elanco Animal Health. The company was founded in 2003 and is based in La Jolla, California.