LIF and neoplasm: A long list of tumor-borne, often proinflammatory factors, including interleukin-6 (IL-6) (3), parathyroid hormone–related protein (PTHrP) (4), leukemia inhibitory factor (LIF) (5), zinc α-glycoprotein (6), or growth differentiation factor-15 (GDF-15) (7), trigger CAC in mouse models.