Microsatellite instability (MSI) is an important molecular mechanism in colorectal cancer's initiation and progression,which has significant clinical significance.MSI is a diagnostic biomarker for Lynch synchrome.Moreover,the clinical implication of MSI testing extends to the role of prognostic marker and predictive maker,due to the better outcome of patients with MSI positive colorectal cancer and a general lack of response to chemotherapy employing 5-fluorouracil.

Objective To study the clinical, histopathological and immunohistochemistric features of different types of primary cutaneous lymphomas.Methods 17 cases of primary cutaneous lymphomas were ret-rospectively reviewed.All cases were classified according to the WHO-EORTC(World Health Organization-Eu-ropean Organization for Research and Treatment of Cancer) classification system combined with morphology and immunobistochemistry.The clinicopathological features of each type were observed and summarized.Results Among the 17 cases, male were 10, female were 7.The average age was 51 years old (from 16 to 78).All pa-tients visited the doctor for skin diseases 14 cases were T-cell lymphoma including 5 cases of primary cutaneous anaplastic large cell lymphuma, 2 cases of mycosis fungoides, 4 cases of subcutaneous panniculitis-like T-cell lymphoma, and 3 cases of primary cutaneous peripheral T- cell lymphomas (including 1 primary cutaneous ag-gressive epidermotropic CD8+ cytotoxic T-cell lymphoma).3 cases were B-cell lymphoma including 2 diffuse large B-cell lymphoma, leg-type and 1 primary cutaneous follicle center lymphoma.Conclusion The clinical behaviors and pathological characteristics of primary cutaneous lymphomas were complicated and variant.Nei-ther of them could be neglected in the diagnosis.

Objective To evaluate vascular endothelial growth factor (VEGF) expression and micro-vascular density (MVD),and their clinicopathological significance in clear cell renal carcinoma (CCRCC).Methods Immunohistochemistry method was used to examine the expression of VEGF.CD34 staining endo-thelial cells were applied to measure the MVD.Results Sixty-six cases of CCRCC were collected.VEGF ex-pressions in 36(54.5%) cases were positive.No significant relationship was detected between VEGF expres-sion and clinicopathological parameters.The MVD value was 12-96.3.The levels of MVD were significantly lower in advanced TNM staging (P=0.000),high grading (P=0.005) and metastasized tumors (P=0.011).In larger tumors,the cases of MVD 50(26.7%) were much less than those of MVD <50 (73.3%).There was no significant relationship between the expression of VEGF and MVD,and neither of them was correlated with the renal capsule infiltration.Conclusion The overexpression of VEGF in CCRCC shows that it may be the target molecule for treatment.The value of MVD is inversely correlated with the grad-ing and staging of CCRCC,indicating its significance in the prognosis assessment of CCRCC.

Objective To discuss the effect of selenoprotein P (SeP) on occurring and developing of colorectal cancer and its clinical significance by detecting the expression of SeP in adjacent mucosa of colorectal cancer, and in the cancer, metastatic lymph node and metastasis hepatic tissues.Methods Tissue microarray was constructed, the expression of SeP in adjacent mucosa of colorectal cancer, and in the cancer, metastatic lymph node and metastasis hepatic tissues were detected by means of immunohistochemistry.Results The positive rate of SeP were 48.4%,69.5%,66.7% and 61.5% in adjacent mucosa, tumor cell, lymph node metastasis and hepatic metastasis. The expression of adjacent mucosa was significantly lower than that in other three sites(?2=16.53,P

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