Forensic pathological significance of immunohistochemical study with CX43 in rats on early myocardial ischaemia / 法医学杂志

OBJECTIVE@#To explore one of evidence for pathologic diagnosis of early myocardial ischaemia.@*METHODS@#Rats were ligated of the left coronary artery according to a previously documented technique, and heart tissue was sampled at different ischaemia time. The expression of CX43 in myocardial cell was detected by Immunohistochemistry.@*RESULTS@#It is showed that the distribution and amount of CX43 positive staining in each group of the myocardial ischaemia was different from that of the control group.@*CONCLUSION@#The changes of CX43 detected by Immunohistochemical methods may be helpful for the diagnosis of early myocardial ischaemia, but further pathologic investigation and research is necessary.

Clinicopathologic study of metaplastic thymoma / 中华病理学杂志

<p><b>OBJECTIVE</b>To study the clinicopathologic characteristics of metaplastic thymoma.</p><p><b>METHODS</b>Resection specimens of 3 cases of metaplastic thymoma were studied by light microscopy, immunohistochemistry and electron microscopy.</p><p><b>RESULTS</b>All the 3 patients were females and aged 33, 58 and 45 years respectively. Histologically, a biphasic growth pattern, consisting of intimate admixture of epithelial cells and spindle cells, was noted. The epithelial cells showed mild cytologic atypia, sometimes nuclear grooves and pseudonuclear cytoplasmic inclusions. These cells were arranged in nests and anastomosing cords. Mitotic figures were rarely seen. On the other hand, the spindle cells were bland-looking, mitotically inactive and arranged in fascicles. Immunohistochemical study showed that the epithelial cells strongly expressed cytokeratin (AE1/AE3) but not vimentin or CD5. The proliferation index, as demonstrated by Ki-67 immunostaining, was about 3% to 5%. In contrast, the spindle cells were diffusely positive for vimentin and epithelial membrane antigen. Staining for CD5 and CD20 was negative. The background lymphocytes were positive for CD3, but not for TdT and CD99. Ultrastructurally, well-formed desmosomes or hemidesmosomes were identified in the epithelial element. They were not detected within the spindle cells.</p><p><b>CONCLUSION</b>Metaplastic thymoma is a rarely encountered indolent or low-grade thymic tumor and may represent a distinct clinicopathologic entity.</p>

Diagnostic accuracy and pitfalls in fine needle aspiration cytology of salivary glands: a study of 113 cases / 中华病理学杂志

<p><b>OBJECTIVE</b>To describe the fine needle aspiration cytology (FNAC) features of various salivary gland lesions and to analyze the respective diagnostic value and pitfalls.</p><p><b>METHODS</b>113 FNAC specimens of salivary gland lesions were reviewed and correlated with clinical and histopathologic findings.</p><p><b>RESULTS</b>The FNAC diagnostic failure (2); non-neoplastic lesions (12); benign neoplasm (82) and malignant neoplasm (17). Cytologically, the distinction between cellular pleomorphic adenoma, adenoid cystic carcinoma and basal cell adenoma could be difficult due to their overlapping morphologic features. The cytologic patterns of primary lymphoepithelial carcinoma of the parotid were indistinguishable from those of metastatic nasopharyngeal undifferentiated carcinoma. The ultimate distinction relied on clinical correlation. The three inaccurately diagnosed cases of FNAC are, as follows: reactive lymphoid hyperplasia of lymph node mistaken as non-Hodgkin lymphoma, mucoepidermoid carcinoma diagnosed as "scanty atypical cells present" and primary lymphoepithelial carcinoma mistaken as benign lymphoepithelial lesion. On the basis of FNAC, 97.4% (110 /113) were correctly depicted as benign (95/96; 99.0%) or malignant (15/17; 88.2%). Furthermore, 90.3% (102 /113) (specificity = 91.9%; 102/111) were accurately diagnosed, including 91.7% (88/96) benign lesions (specificity = 92.6% ; 88/95) and 82.4% (14/17) malignant tumors (specificity = 87.5%; 14/16).</p><p><b>CONCLUSIONS</b>FNAC is reliable in distinguishing benign and malignant salivary gland lesions. A specific cytologic diagnosis is often possible. On the other hand, due to the pitfalls in cytologic diagnosis of certain salivary gland tumors, tissue biopsy for histologic examination may be necessary.</p>

Expression of MMP-2 and E-CD in salivary mucoepidermoid carcinoma and its correlation with infiltration, metastasis and prognosis / 浙江大学学报·医学版

<p><b>OBJECTIVE</b>To study the expressions of matrix metalloproteinase 2 (MMP2) and E-cadherin (E-CD) in salivary mucoepidermoid carcinoma, and their relationship with clinical stages, pathological grading, lymph node metastasis and prognosis.</p><p><b>METHODS</b>Surgical specimens of salivary mucoepidermiod carcinoma and normal salivary gland tissue were collected. MMP-2 and E-CD were stained immunohistochemically with streptavidin peroxidase method.</p><p><b>RESULTS</b>The expression of MMP-2 was increased and the expression of E-CD was reduced or negative in salivary mucoepidemoid carcinoma compared with those of the normal salivary gland. Expression of MMP-2 and E-CD was closely correlated with lymph node metastasis of the mucoepidermoid carcinoma. MMP-2 was positively correlated with the prognosis of mucoepidermoid carcinoma, and E-CD was negatively correlated to the prognosis of mucoepidermoid carcinoma.</p><p><b>CONCLUSION</b>The expression of MMP-2 and E-CD is closely correlated with the metastasis and prognosis of salivary mucoepidermoid carcinoma.</p>