In. Fernando et al., IMMUNOCYTOCHEMICAL STAINING FOR THE C-ERBB-2 GENE-PRODUCT IN BREAST ASPIRATES - A PRELIMINARY-REPORT, Cytopathology, 4(4), 1993, pp. 219-224
The results of the determination of c-erbB-2 gene expression by immuno
cytochemical staining of cytological aspirates, prepared by cytocentri
fugation, have been compared with paraffin-embedded tissue sections fr
om the same tumour. Our results show equivalent staining in 20/22 case
s, with six cases being both scored positive and fourteen cases being
both negative. Two samples gave conflicting results. One case was scor
ed as being positive on the cytological aspirate, whereas in the tissu
e sections taken from the same tumour positive staining was only seen
in areas of non-invasive intraduct carcinoma. This sample was scored a
s being negative. In another case, cytoplasmic staining with less than
50% of the cells showing any positivity was observed in the cytospin
sample, with negative staining in the corresponding tissue section. We
conclude that expression of c-erbB-2 immunostaining is detectable on
cytological preparations prepared by cytocentrifugation but must be in
terpreted with caution in tumours which may have a large intraduct com
ponent or which give predominant cytoplasmic staining.