Nuclear morphometry and proliferative activity evaluation in the gastrointestinal stromal tumors

Vol. 55 No. 2 Suppl., 2014
This supplement was not sponsored by Outside Organizations.

ROMANIAN JOURNAL of MORPHOLOGY and EMBRYOLOGY

Valeriu Ardeleanu, Aurel Nechita, Laurian Lucian Francu, Costinela Georgescu

Twenty-two cases with gastrointestinal stromal tumors (GISTs) have been studied, sized from 2 cm to invasive gigantic tumors and also from low to high degree of malignancy. The altering of the form and the size of the nucleus is a reference point of malignancy, being used in the histological grading of many types of tumors and also as an appreciating parameter of the tumoral prognosis, with a high degree of accuracy in the colorectal, uterine, prostatic or ovarian cancers, as it was pointed in the previous researches. The aim of this study is to evaluate the dimensional characteristic of the nuclei and the mitosis in GIST with a cholic and gastric localization, attempting a quantitative differentiation of the two tumors, by studying the following aspects: nuclear dimensions, mitotic activity index and the mitotic density. The results of the proliferative activity quantification (mitotic activity index and mitotic density) have shown that this can be a decisive criterion for the precocious appreciation of the evolution. The most important morphological criterion with a predictive role is the mitotic activity index, but is recommended to be applied correlated with the size and the localization of the tumor. Although various nuclear morphometry studies in different types of malignant tumors have been performed, the data in gastrointestinal stromal tumors is scarce and only few similar studies have been reported in the specialty literature; from this point of view, the present study is new and original and is also trying to point out that even with GIST, such analysis and prognosis is as valuable as in any other malignant diseases.

Corresponding author: Laurian Lucian Francu, Assistant, MD, PhD; e-mail: laurianfrancu@yahoo.com

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ROMANIAN JOURNAL of MORPHOLOGY and EMBRYOLOGY

Dorel Arsene, Maria Comanescu, Carmen Ardeleanu

Routine histopathological criteria are poor predictors of the outcome in meningiomas. The present study tried to determine if some adhesion cell molecules could be helpful in assessing the histological aggressiveness in meningiomas of all grades. Our series comprised 113 cases, WHO grade I (n=53), WHO grade II (n=47) and WHO grade III (n=13). Three cases of meningeal non-meningothelial tumors (hemangiopericytoma, hemangioblastoma and fibrosarcoma) were also studied as control tissue. Immunohistochemistry for CD44, CD54, E-cadherin, progesterone receptor (PGR) and Ki67 was performed. CD54 was for the first time systematically assessed in meningiomas of all three grades of malignancy. CD44 and CD54 were expressed in 58.4 and 31.72% of cases, respectively. CD54 expression showed a direct correlation with the degree of histological anaplasia and Ki67 values. More than half of cases (58.11%) were negative for E-cadherin, mostly the anaplastic ones, which also showed less positive areas for this marker. Cell adhesion molecules were not significantly related to a particular histological type and proliferating potential of meningiomas. Overall, CD54 as well as E-cadherin could be used as additional aggressiveness indicators aside the classical ones. On the other way, Ki67 once again confirmed its significant role in the assessment of meningioma aggressiveness.

Corresponding author: Dorel Arsene, MD, PhD; e-mail: dorelarsene@yahoo.com

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