SFRP1 and breast carcinoma: Luminal B breast cancer patients with high SFRP1 expression had a better prognosis in term of RFS (HR = 0.74; logrank p = < 0.01; Figure 8C) and OS (HR = 0.66; logrank p = < 0.05; Figure S4C) than patients with low SFRP1 expression.