Previous research has indicated that prostaglandin receptors and transporters, including prostaglandin transporter (PGT), multiple drug resistance-associated protein 4 (MRP4), and PGE2 receptors (EP4), exhibit differential expression in various breast cancer cells and may play a role in maintaining PGE2 balance [9,23,24]. The gene discussed is SLCO2A1; the disease is breast carcinoma.