Biontech SE and Bristol Myers Squibb Co. are teaming up to develop Biontech’s BNT-327 in a deal possibly worth over $11 billion. BNT-327 is in the hot new class of bispecific antibodies targeting programmed death-1 (PD-1) or its ligand (PD-L1) and vascular endothelial growth factor (VEGF). The bispecifics take advantage of two well established mechanisms of action that help tumors grow; PD-1/PD-L1, which tells immunogenic T cells not to attack the tumor, and VEGF, which tumors excrete to produce new blood vessels to supply oxygen and other nutrients to the tumor.