Bitterroot Bio is a Palo Alto, California clinical-stage biotechnology company pioneering the field of cardio-immunology - the science of how the immune system drives heart disease. Founded by veterans of Forty Seven (the CD47 company Gilead bought for ~$5 billion), Bitterroot is turning the immune-checkpoint playbook from cancer toward atherosclerosis. Its lead candidate, BRB-002, is an immunomodulating protein that blocks the CD47 'don't eat me' signal on arterial plaque, prompting macrophages to clear inflammation and stabilize plaque - a mechanism that works differently from cholesterol-lowering drugs. The company launched out of stealth in June 2023 with a $145 million Series A, which it called the largest-ever round for a preclinical cardiovascular biotech.
HanchorBio is a clinical-stage biotechnology company building next-generation cancer and autoimmune therapies on its proprietary Fc-Based Designer Biologics (FBDB) platform. Founded in 2020 by Henlius co-founder Scott Liu, the company engineers multi-target Fc fusion proteins designed to reach tumors that resist conventional PD-1/PD-L1 checkpoint drugs. Its lead candidate, HCB101, is an affinity-optimized SIRPalpha-Fc fusion protein targeting the CD47-SIRPalpha 'don't eat me' pathway, engineered to spare red blood cells and avoid the anemia that sank earlier anti-CD47 programs. With operations spanning Taipei, Shanghai, and the San Francisco Bay Area, HanchorBio is advancing a pipeline across solid and hematologic cancers and autoimmune disease.