ZINC05626394 is a cytochrome b5 reductase 3 inhibitor with activity by increasing nitric oxide bioavailability. ZINC05626394 may have potential applications in anti-cancer suppression, especially in combination with antibody drug conjugates (ADCs) and immune checkpoint inhibitors. The efficacy of ZINC05626394 may be limited by different mechanisms, including antigen-related resistance and failure of endocytosis[1].