ABSTRACT
Objective@#To investigate the clinicopathologic and molecular characteristics, diagnostic, differential diagnostic and prognostic features of malignant gastrointestinal neuroectodermal tumor.@*Methods@#Two cases of malignant gastrointestinal neuroectodermal tumor were retrieved; the clinical and radiologic features, histomorphology, immunophenotype, molecular genetics and prognosis were analyzed and the relevant literature reviewed.@*Results@#Case 1 was a 57-year-old male, presented with recurrent abdominal pain and melena. Pelvic imaging showed a circumscribed thickening of the wall of a small intestinal segment, and a malignant lymphoma was favored. Case 2 was a 24-year-old male, presented with recurrent small intestinal malignancy. Imaging demonstrated multiple masses in the peritoneal and pelvic cavities, and a malignant gastrointestinal stromal tumor with multiple metastases was suspected. Grossly both tumors were located mainly in the muscularis propria of small intestine. Case 1 showed a single 5.5 cm tumor; and case 2 consisted of two tumors measuring 4 cm and 6 cm respectively. Microscopic examination of both tumors showed small round blue, but focally spindled or clear tumor cells in solid pattern. The tumor cells had scanty cytoplasm, indistinctive nucleoli and brisk mitoses. Osteoclast-like giant cells were dispersed within the stroma. In case 1 rosette-like and pseudo-papillary growth patterns were noted, and in case 2 there were variable-sized hemorrhagic cysts. By immunohistochemistry, both tumors showed strong and diffuse expression of SOX10 and S-100, and focal to diffuse expression of neuroendocrine markers (CD56 or synaptophysin). Case 2 exhibited focal reactivity to pan-cytokeratin. Both tumors lacked expression of markers associated with gastrointestinal stromal tumor, smooth muscle tumor, melanoma (HMB45 or Melan A), dendritic cell tumor and Ewing sarcoma. Fluorescence in situ hybridization analysis demonstrated EWSR1 rearrangement in both tumors and the next generation sequencing confirmed EWSR1-ATF1 gene fusion in case 2. At follow-up of 16 months, case 1 was recurrence or metastasis free; whereas case 2 showed multiple recurrences and metastases within 19 months although stable disease was transiently achieved when treated with combinations of multidrug and targeted chemotherapy.@*Conclusions@#Malignant gastrointestinal neuroectodermal tumor is a rare and aggressive soft tissue sarcoma with a predilection for small intestine. It has distinctive morphologic, immunohistochemical and molecular characteristics and needs to be distinguished from other small blue round and spindle cell tumors that occur in the gut. Careful attentions to its characteristic histomorphology with the judicious use of immunohistochemistry and molecular genetics can help to distinguish this tumor from its many mimickers.
ABSTRACT
Objective To evalume the efficacy and side effect of capecitabine combined chemotherapy regimen in treatment of advanced cohrectal cancer in senile patients.Methods Seventy-seven cases senile patients with advanced colorectal cancer were randomly divided in two groups.capecitabine combination group (36 cases) received oxaliplatin (L-OHP)+ eapecitabine regimen, OLF group (41 cases) received L-OHP+ FU/CF regimen. The efficacy and side effect were observed and compared between two groups.Results eapecitabine combination group:the cfficiency rate was 41.67%,the tumor control rate was 77.78%.meso-tumor to progression was 7.9 months.OLF group:the efficiency rate was 39.02%,the tumor control rate was 75.61%,meso-tumor to progression was 7.2 months.The effectiveness in two groups had no significant difference (P＞005).There was no serious chemotherapy related side effect in two groups.The rates of marrow inhibition,nausea,vomiting,diarrhea,alopecia,rash,the lesion of liver and renal function and peripheral neuritis were similar in two groups.The rate of hand-foot syndrome was apparently higher in capecitabine combination group compared with OLF group (P＜0.05).Conclusions For senile advanced colorectal cancer patienrs,the treatment efficiency is similar between capecitabiae combination regimen and OLF regimen,the side effect is all tolerated in two regimens.capecitabine combination regimen is oral adminisuered and decurates hospitnlization time and improved the life quality of senile patients.capecitabine combination regimen is a suitable fast-line regimen for senile advanced colorectal cancer pafients.