BEIJING – Yisheng Biopharma Co. Ltd., of Beijing, said it has inked a pact with U.S. biotech Tavotek Biotherapeutics, of Ambler, Pa., to co-develop a combination therapy with Yisheng’s YS-ON-001/002 and Tavotek’s Tavo-301/303 the companies hope could prove a more efficacious cancer treatment than the popular anti-PD-1/PD-L1 monotherapies. YS-ON-001 and YS-ON-002 are potent agonists of TLR3, MDA5 and RIG-I pathways. Meanwhile, Tavo-301/303 is a series of novel multispecific antibody-based immuno-oncology assets.