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Ki67 LABELLING INDEX IN GASTRIC CARCINOMAS. AN IMMUNOHISTOCHEMICAL STUDY USING DOUBLE STAINING FOR THE EVALUATION OF THE PROLIFERATIVE ACTIVITY OF DIFFUSE‐TYPE CARCINOMAS
Author(s) -
RAMIRES MARIA,
DAVID LEONOR,
LEITÃO DINA,
SEIXAS MÁRIO,
SANSONETTY FILIPE,
SOBRINHOSIMÕES MANUEL
Publication year - 1997
Publication title -
the journal of pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.964
H-Index - 184
eISSN - 1096-9896
pISSN - 0022-3417
DOI - 10.1002/(sici)1096-9896(199705)182:1<62::aid-path849>3.0.co;2-2
Subject(s) - immunohistochemistry , staining , pathology , ki 67 , labelling , biology , medicine , biochemistry
The aim of the present study was to clarify the conflicting recorded data on the proliferative features of gastric carcinoma. The Ki67 labelling index (Ki67 LI) was evaluated using MIB‐1 in 43 carcinomas (24 diffuse and 19 intestinal). In 18 cases, differential counts were performed in superficial and deep layers. In ten diffuse carcinomas with a prominent desmoplastic response, Ki67 LI was evaluated in sections double‐stained with MIB‐1 and CAM5.2. Flow cytometry was performed in 26 cases. Ki67 LI of diffuse carcinomas (36·3±19·0) was not significantly different from that of intestinal carcinomas (28·2±18·5). Ki67 LI was significantly higher ( P =0·006) in superficial than in deep areas (41·9±22·7 and 29·7±19·7, respectively) regardless of histological tumour type. No significant relationship was observed between Ki67 LI and wall invasion, lymph node metastasis, vascular invasion or ploidy. The following conclusions were drawn: double immunostaining techniques are apparently the best way to overcome the underestimation of cell proliferation in diffuse gastric carcinomas with a prominent desmoplastic response; the diffuse and intestinal types of gastric carcinoma have proliferation rates within the same range, even when the comparison is restricted to diploid tumours; and, finally, the major pool of proliferating cells resides in the superficial areas of gastric carcinomas, regardless of the histotype, which should be taken into consideration when overall counts are performed, using either immunohistochemical markers in tissue sections or suspensions of nuclei in flow cytometry. © 1997 John Wiley & Sons, Ltd.