Although a key enzyme Elovl5 promoting ferroptosis in gastric cancer cells [16], was no increase in expression, another elongase Elovl7 was increased (Fig. 4D), which catalyzes the rate-limiting step in the synthesis of very long-chain fatty acids and exhibits the highest activity toward 18-carbon fatty acids [17, 36]. The gene discussed is ELOVL7; the disease is gastric cancer.