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Biomedical subjects

G M Mariuzzi

Publications and source records attributed to G M Mariuzzi.

11 recordsLinked to original sources
PubMed1992

Epithelial dysplasia of the gastric mucosa. A morphometric and ploidy pattern study.

60 cases of gastric dysplasia (20 mild, 20 moderate and 20 severe) were quantitatively studied and compared with cases of hyperplastic polyp (No 10), intestinal metaplasia (No 20), peptic ulcer (No 10) and invasive adenocarcinoma (No 20). In each case the area, the perimeter and the integrated optical density of 100 nuclei were measured in Feulgen stained tissue sections by means of a Leitz TAS. The stepwise discriminant analysis demonstrates that severe dysplasia and adenocarcinoma can be well distinguished from mild and moderate dysplasia. The ploidy pattern study demonstrates that the presence of severe dysplastic changes corresponds to a sharp increase in the degree of aneuploidy. In peptic ulcer, intermediate values between "benign" and "malignant" lesions were found.

Adenocarcinoma↗
PubMed1992

Quantitative study of the precancerous and malignant lesions in colorectal adenomas.

150 endoscopically removed colorectal adenomas are quantitatively studied. In 90 cases dysplastic glands constituted the entire lesion (30 mild, 30 moderate, 30 severe); in 60 cases foci of adenocarcinoma were present (30 intramucosal, 30 submucosal). In each case the area, the perimeter and the integrated optical density of 100 nuclei were measured from Feulgen-stained paraffin sections. The results show a continuous neoplastic progression in the trends of the morphometric parameters as well as in the ploidy pattern. The stepwise discriminant analysis defined the morphometric features of the atypical nuclei, which were present in small numbers also in mild dysplasia; they progressively increased in number, reaching the maximum in submucosal carcinoma.

Adenocarcinoma↗
PubMed1991

The value of necropsy in oncology.

The effectiveness of diagnostic procedures in cancer patients was evaluated by comparing clinical with necropsy findings. Necropsy and clinical records of 102 patients were reviewed for primary site and histology of tumour, metastatic sites, presence of second neoplasms, associated non-neoplastic diseases, terminal illness and cause of death. Major discordances between clinical and postmortem findings were found in 34 (33%) cases: in 10 of these a correct clinical definition of site and histology of the primary tumour would have resulted in a change of management and prognosis; in 4 cases in which a major non-neoplastic pathology had been responsible for death, correct diagnosis might have resulted in prolongation of survival. Spread of disease was generally underestimated, even for metastases in clinically accessible organs. Even more disappointing were the clinical data related to terminal illness and cause of death (43% overall concordance).

Autopsy↗
PubMed1990

Quantitative analysis of prostatic intraepithelial neoplasia on tissue sections.

The changes in nuclear morphology (karyometry) and DNA content in prostatic intraepithelial neoplasia (PIN) were analyzed on tissue sections. The cases of PIN were subdivided into PIN 1 and PIN 2 based on the degree of proliferation and the anaplasia of the secretory cells lining the ducts and acini. Cases of nodular hyperplasia (NH) and adenocarcinoma were also studied for comparative purposes. Karyometric analysis showed a progression of most values from NH to PIN to carcinoma. The DNA analysis showed a decrease in the frequency of nuclei in the diploid range and an increase in the percentage of nuclei in the other ploidy regions (especially between 2c and 4c and in the tetraploid range) from NH to PIN to carcinoma. Forward stepwise discriminant analysis showed similarities between NH and PIN 1 and between PIN 2 and carcinoma. These findings suggest that the evolution towards adenocarcinoma is characterized by progressive morphologic derangements of the nuclei and by the transformation of the diploid DNA content into a nondiploid one, with the changes taking place at the level of PIN 2.

Adenocarcinoma↗
PubMed1990

Morphological and quantitative analyses of intraductal dysplasia of the prostate.

The aim of our study was to characterize quantitatively the cellular and architectural features of intraductal dysplasia (ID) (subdivided into two grades), in comparison with benign prostatic hyperplasia (BPH) and adenocarcinoma (AC). The research was carried out on histological sections where the mean nuclear and cellular area, the mean nuclear cytoplasmic (N/C) ratio and parameters related to nuclear crowding and stratification were evaluated. The mean nuclear area and the mean N/C ratio steadily increased from BPH to ID and to AC. As for the mean cellular area, the values decreased from BPH to ID grade 1: in the two grades of ID the values remained about the same; in the AC, the mean cellular area was intermediate between ID and PBH. The mean crowding index showed increase in ID grade I, in comparison with BPH, and then a decline from ID grade 2 to AC. The stratification related features (mean epithelial height, mean nuclear stratification height, stratification index) showed ID values greater than in BPH, while in AC smaller than in BPH; in ID grades 1 and 2 the values were similar. The results clearly indicate that mean nuclear area helps to discriminate BPH and AC. A partial separation between the two grades of ID is possible by combining the mean nuclear area and the mean nuclear crowding index in a bivariate analysis.

Adenocarcinoma↗
PubMed1978

Decrease of alpha-Hasharon globin in beta-thalassaemia.

In time course experiments performed in subjects carrying haemoglobin Hasharon and beta-thalassaemia the synthesis of alphaA-, alphaHasharon-, beta- and gamma-globin has been determined. The alpha-globin molecules synthesized in excess were found to be removed from the red cell cytoplasm (phenomenon characteristic of beta-thalassaemia, described by Bargellesi et al, 1968a); in addition the alphaHasharon-globin molecules were removed at a faster rate than normal alpha-globin. The preferential removal of the mutant alpha-globin explains the reduced level of haemoglobin Hasharon found in subjects carrying the gene for beta-thalassaemia (Alberti et al, 1975). Reductions below normal levels of other haemoglobin variants occurring in the presence of the counterpart-globin thalassaemia are probably determined through a similar mechanism.

Genes↗
PubMed1975

Haemoglobin Hasharon in a north Italian community.

A survey of haemoglobin variants undertakin in an Italian community (Polesine) has revealed the presence of haemoglobin Hasharon (alpha2 47 Asp yields His beta2) in 108 subjects from 40 families. The variant accounted for 30 to 40% of the total haemoglobin. In subjects doubly heterozygous for Hb Hasharon and beta thalassaemia, the proportion was 17 to 19%. Though there was some evidence that the variant was unstable in vitro, there was no obvious haemoglobinopathy in vivo.

Amino Acids↗