Maxillary osteosarcomas are a relatively frequent malignant tumor of the oral cavity. Similarly to other skeletal osteosarcomas, they exhibit different cellular differentiation patterns, i.e. chondroblastic, osteoblastic, or fibroblastic. Although their histological features resemble those of osteosarcomas of the long bones, their pattern of evolution usually differs. Morphometric variations in...

The AgNOR argyrophil technique was applied to clear cut examples of renal adenoma (n = 7), clear cell carcinoma (n = 9), and xanthogranulomatous pyelonephritis (n = 5). There was no significant difference between mean AgNOR counts per cell in adenomas and carcinomas, supporting the idea that there is a continuous spectrum of kidney tumours. Xanthogranulomatous pyelonephritis and clear cell carc...

The aim of the study was an evaluation of the proliferation activity of Central Nervous System tumours by using silver colloid staining of nucleolar organiser regions (AgNORs) and comparing the results with the proliferation activity estimated by using PCNA and Ki-67 antibodies to clarify the clinicopathological significance of this method. The first part of the study describes the results of A...

Argyrophilic nucleolar organizer regions (AgNORs) were determined in 94 pleural, pericardial and peritoneal effusions. The results were correlated with cytologic diagnosis to determine the diagnostic potential of this technique. Cytologically the number of normal, reactive and malignant effusions were 32, 28 and 34 respectively. The mean AgNOR counts for normal, reactive and malignant spec...

BACKGROUND The numbers of nucleolar organiser regions (AgNORs) per cell has been considered as an indicator of the cellular proliferative activity. A study was carried out to examine whether AgNOR numbers relate to the growth rate in squamous cell carcinoma of the lung. METHODS AgNORs were stained by a one step silver method, and examined in representative paraffin sections from 45 cases of s...

Objectives To evaluate the number of AgNORs per nucleus and the expression of Ki-67 at the tumor invasion front (TIF) in relation to clinical parameters (TNM), TIF classification and the prognosis of oral squamous cell carcinomas in an Uruguayan population. Material and Methods This study was conducted through a retrospective survey from 2000 to 2010 at the National Institute of Cancer Montev...

The nucleolar organizer regions are used as a new marker in proliferation cell. AgNOR are loops of DNA actively transcribing to ribosomal RNA and they are associated with nonhistone proteins with strong argyrophil. In the present study we correlated the relationships between number and size of AgNOR measured by an automatic image analysis using CAS-100, in eleven breast carcinomas in different ...

Bachground & Aims: Oral lichenoid reactions (OLR) and oral lichen planus (OLP) are clinically and histopathologically similar but their therapeutic approach are different. Due to the presence of dysplasia in oral lichen planus which effects prognosis, the aim of study was the evaluation of proliferation activity of OLPs and OLRs and their subtypes. AgNOR technique that is inexpensive and easy...

PURPOSE The purpose of the present study was to investigate the possible role of Ki-67 and argyrophilic nucleolar organizing regions (AgNOR) between the recurrent and nonrecurrent keratocystic odontogenic tumors (KCOTs). Another aim was to compare the correlation between these two markers. MATERIALS AND METHODS 22 KCOTs were evaluated retrospectively. The actual proliferative activity of the ...