Myeloid cells can stimulate anti-tumor effects in the body and recruit additional immune system cells to turn a cold tumor hot. Bolt Biotherapeutics is developing a new category of immunotherapies that combines the precision of antibody targeting with the strength of the innate and adaptive immune systems. By activating and recruiting myeloid cells, the company’s experimental therapies are designed to re-program the tumor microenvironment and invoke an anti-tumor immune response. We spoke to Randy Schatzman, CEO of Bolt Biotherapeutics, about the company’s immune-stimulating antibody conjugates, the case for activating both the innate and adaptive immune systems to fight cancer, and the company’s lead experimental therapy for HER2 positive cancers.