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Purpose To study the clinicopathologic and genetic features of clear cell sarcoma of the gastrointestinal tract. Methods One case of clear cell sarcoma of the gastrointestinal tract was analyzed by histology, immunohistochemistry, fluorescence in situ hy-bridization ( FISH) , with review of relevant literatures. Results A female patient was admitted to the hospital with a history of 1-week abdominal pain. Computed tomography revealed a mass in right hemicolon. A grey-white ulcerated mass was observed in the colon, in-volving the entire thickness of the colon wall extending into the subserosa. Microscopically, medium-size oval or round cells were ar-ranged in sheets and scattered osteoclast-like multinucleated giant cells were also presented. Immunohistochemically, the tumor cells were strongly positive for S-100 protein, but negative for HMB-45, Melan-A, CD117, CD1a and PCK. FISH showed the rearrangement of EWSR1 in 74% of the neoplasm cells. Conclusions Clear cell sarcoma of the gastrointestinal tract is an extraordinarily rare gastro-intestinal neoplasm that shows peculiar histopathological, immunohistochemical, ultrastructural, and genetic features. Whether clear cell sarcoma-like gastrointestinal tumor represents a distinct entity awaits larger series, including cytogenetic or molecular biological in-vestigation.
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Objective To assess the effect of leukocyte fihration on systemic inflammatory response to cardiopulmonary bypass.Methods Twelve mongrel dogs weighing 25-30 kg were randomly divided into 2 groups (n=6 each):control group(C)and leukocyte depletion group(LD).The dogs were anesthetized with intraperitoneal pentobarbital 25 mg?kg~(-1).The trachea was intubated.The arterial line of CPB was connected with aortic cannula and the venous line with a cannula inserted into right atrium.The leukocyte-depletion filter LD-1 was positioned in the venous line of CPB circuit.Aorta was clamped at 10 min of CPB and St.Thomas cardioplegic solution 20 ml?kg~(-1) was injected into the root of aorta.The filter was used for 5 min starting from 2 min of CPB. Aorta was clamped for 60 min.Blood samples were taken from femoral vein before CPB(T_0,baseline), immediately after aortic clamping(T_1)at 30 min of aortic clamping(T_2)5 min after aortic unclamping(T_3)at the termination of CPB(T_4)and 2 h after termination of CPB(T_5)for leukocyte count and determination of plasma L-selectin,IL-6 and IL-8 concentrations and MPO activity.The IL-6 and IL-8 concentrations in the filter LD-1 were measured at 30,60 and 90 rain after leukocyte filtration.The membrane of filter LD-1 was taken at 90 min after filtration for microscopic examination.Results The leukocyte count was significantly lower at T_1 in LD group than in C group.The plasma L-selectin,IL-6,IL-8 concentrations and MPO activity were significantly increased during CPB as compared to the baseline at T_0 in both groups but were lower at T_5 in LD group than in C group.The IL-6 and IL-8 concentrations in LD-1 filter were increased at 60 and 90 min after filtration as compared to those at 30 min.The filter membrane was covered with enormous number of leukocytes.Conclusion Leukocyte filtration can decrease systemic inflammatory response to CPB in dogs.