Gastrointestinal stromal tumors (GIST) are neoplasm of mesenchymal origin that usually begins in cells of the wall of the gastrointestinal tract. It can be benign or malignant. In this report, we have presented a case of malignant GIST with uncommon site of metastasis. This is of interest because of three reasons. Firstly, metastases to the testis are extremely rare. However, metastases to distally localized organs are not commonly associated with GIST, and finally, to our knowledge this is the first case of malignant GIST metastasis to the testis reported in the world.

The effects of nonsteroidal mycotoxin zearalenone on the lymphoid tissue of thymus in a sense of investigating the subacute toxicity Wistar-albino rats have been examined in the course of the study. We analyzed 42 rats' specimens of both gender, treated with three dosage levels: 0,5; 2 and 4 mg/kg of body weight, after oral submission of the compound, and observed during three different time intervals: 10, 20 and 30 days. Microscopically was semiquantitatively determined lymphophagocytosis (apoptosis) and cortical thymic cellularity. It was percepted statistically significant growth of lymphophagocytosis compared to a dosage (p<0,01), as well as combination of dosage and interval (p<0,001), while gender had no statistically significant influence on tested parameter (p>0,05). Changes in cortical thyme cellularity were not percepted. Effects of applied doses of zearalenone on the lymphoid tissue of thymus were very mild and in correlation with estrogenicity. They are probably the result of interaction with estrogenic receptors.

AIM OF THE STUDY To investigate the correlation between the expression of HER-2 membrane protein and basic pathohistological parameters in cases of infiltrative breast cancer. MATERIAL AND METHODS Sixty-nine cases of lobular infiltrative breast cancer were investigated. Mastectomy with a dissection of axillary's lymph nodes was performed in all cases. Upon standard procedure of formalin fixation, embedding in paraffin and examination of slides stained with hematoxillin-eosin, a semiquantitaive method of evaluation of immunohistochemical expression of the HER-2 protein has been performed in all tissue samples of the tumor. RESULTS Majority of patients (91,3 %) were above 41 year-of-age. In the majority of cases (44,9 %) cancer's diameter ranged from 20-50 mm (pT2), with a moderate degree of differentiation (46,4 %), no signs of vascular invasion (50,7 %) and no metastases in axillary's lymph nodes (65,2 %). Evaluation of immunohistochemical expression of the HER-2 protein revealed that only the degree of tumor differentiation has been in statistically significant (p=0, 037) correlation with the intensity of the HER-2 protein expression. CONCLUSION In cases of lobular infiltrative breast cancer, oncogenic effect of the HER-2 protein was associated with the degree of cellular differentiation, while it was not in correlation with other pathological parameters of poorer prognosis, such as the size of tumor, presence of vascular invasion and occurrence of metastases in regional lymph nodes.

Giant cell fibroblastoma (GCF) is a rare type of fibroblastic tumor, first described as a juvenile form of dermatofibrosarcoma. Although recurrences are common after local surgical resection, metastasis is not reported.We report a case of a 4-year-old boy with giant cell fibroblastoma, in which the neoplasm was characterized histologically by a proliferation of spindle-shaped cells intermixed with pseudovascular channels called "angiectold spaces". The spaces were lined by large cells with pleomorphic nuclei intermixed with multinucleated cells. Immunohistochemically, the tumor stained diffusely for vimentin and CD34, but negative for S 100 protein. Since the initial description in 1982, less than 100 cases of GCF have been reported. This patient's presentation is particularly interesting because present the first case reported in Bosnia and Herzegovina.

The aim of the study was to investigate the relationship between the expression of the HER-2 membrane protein and other clinical-pathological parameters such as: histological size of the tumor, degree of the tumor's differentiation, presence of vascular invasion and presence of metastases in regional lymph nodes, in cases of ductal infiltrative breast cancer. We have investigated 56 cases of ductal infiltrative breast cancer. In all patients a mastectomy with a dissection of axillary lymph nodes has been performed. All tissue samples, taken by biopsy, were embedded in the paraffin, stained by hematoxylin-eosin technique and screened, and evaluation was performed by using a semiquantitative method of the immunohistochemical expression of the HER-2 protein. A decrease of the protein HER-2 expression was noticed in cases of an increase of the tumor's diameter above 50 mm. Increased expression of the HER-2 protein was noticed in cases of moderate (grade II) and poor (grade III) differentiation of carcinoma, as well as in cases where there was no metastases in the regional lymph nodes. No relationship has been observed between the expression of HER-2 and occurrence of vascular invasion. In cases of ductal infiltrative breast cancer the expression of HER-2 protein is in correlation with the size and degree of tumor's differentiation, as well as with the presence of metastases in regional lymph nodes.