FBL and breast neoplasm: The existence of breast tumors underexpressing FBL identified at mRNA levels was supported by FBL immunostaining in TMAs: i) similar proportion of breast tumors exhibiting no FBL signal in two different breast tumour series; ii) preservation of nucleoli during sample processing; and iii) significant reduction of FBL mRNA levels in these tumors compared to FBL-stained tumors.