Positive correlations emerged between: 24-h urinary norepinephrine and LAT1 expression (rho = 0.384, p = 0.0158); 24-h urinary metanephrine and PNMT gene expression (rho = 0.680, p < 0.0001); metanephrine expression and tumor size (rho = 0.327, p = 0.0170); and 24-h urinary normetanephrine expression and tumor size (rho = 0.564, p < 0.0001) (Figure 2A–D). The gene discussed is SLC7A5; the disease is neoplasm.