SFRP1 and ductal breast carcinoma in situ: RNA and protein levels were similar with elevated PKMYT1 and TGF-α in DCIS fibroblasts and stromal tissues compared to normal fibroblasts and stromal tissues, and higher SFRP1 and SFRP2 expression in DCIS fibroblasts and stromal tissues compared to IDC fibroblasts and stroma.