Nucleolar organizer regions in small nodular lesions representing early stages of human hepatocarcinogenesis.

Abstract:

BACKGROUND:It is believed that in the early stages of hepatocarcinogenesis, some adenomatous hyperplasias (AH) progress to early hepatocellular carcinoma (eHCC), and that many eHCC develop into overt hepatocellular carcinoma (HCC) through nodule-in-nodule formation. However, the proliferative activity of these small nodular lesions has not been fully investigated. METHODS:Cell proliferative activity was assessed by counting nucleolar organizer region-associated proteins (Ag-NOR) in paraffin sections of 12 AH nodules, 25 eHCC nodules, and 8 nodule-in-nodule lesions. In nodule-in-nodule lesions, an area of well-differentiated HCC corresponding to eHCC and a discrete inner nodule area composed of obvious HCC were examined. RESULTS:Mean Ag-NOR numbers of extranodular parenchyma, AH, and eHCC were 1.35, 1.35, and 1.75 (P < 0.01), respectively. With regard to the relative Ag-NOR number compared with that of parenchyma, there was no overlap between AH and eHCC with a border of 1.1-fold except in one specimen. In nodule-in-nodule lesions, the mean Ag-NOR number (2.53) in the inner nodular area was much higher (P < 0.01) than that of the area of eHCC (mean, 1.88). CONCLUSIONS:A stepwise increment of Ag-NOR number was demonstrated in accordance with the multistep of the AH to eHCC to nodule-in-nodule lesion sequence of hepatocarcinogenesis. Thus, it was proposed that the Ag-NOR count may be a practical and objective parameter for assessing the malignant potential of hepatocellular neoplasms histopathologically.

journal_name

Cancer

journal_title

Cancer

authors

Aoki K,Sakamoto M,Hirohashi S

doi

10.1002/1097-0142(19940115)73:2<289::aid-cncr28207

subject

Has Abstract

pub_date

1994-01-15 00:00:00

pages

289-93

issue

2

eissn

0008-543X

issn

1097-0142

journal_volume

73

pub_type

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