BC patients presented higher expression levels of miR-324-5p, miR-4738-3p, and FBJ murine osteosarcoma viral oncogene homolog B (FOSB) mRNA, and lower expression levels of lncRNA miR-497-HG and Regulator of Calcineurin 1 (RCAN1) mRNA on voided urine. The gene discussed is RCAN1; the disease is breast cancer.