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Neurofibromatosis type 1 (NF-1) is an autosomal dominant hereditary disease with association of tumorous condition of body. Although the pathogenesis of tumorous condition with NF-1 is unclear, there were several reports for gastrointestinal tumors (GISTs) of gastrointestinal tract or nervous system tumors. However, there are few reports of appendiceal neurofibroma in NF-1 patients. We report here a case of NF-1 patient with multiple jejunal GISTs and appendiceal neurofibroma. A 61-year-old man was referred to department of surgery for abnormal findings of appendix on abdominal computed tomography scan. He underwent the laparoscopic appendectomy and laparoscopy-assisted segmental resection of proximal jejunum and he had numerous masses on duodenum and proximal jejunum in the operative findings. The pathologic findings revealed the neurofibroma of appendix and multiple GISTs of the jejunum.

Background: Cancer stem cells are a small population of tumor cells capable of self-renewal that give rise to all the components of a heterogenous tumor. Recently, this concept has been extended into various solid tumor after the first documentation in acute myeloid leukemia. CD133 and CD 24 were identified as cancer stem cell markers in other solid tumors such as breast cancer, brain cancer, pancreatic cancer and head and neck cancer. The aim of this study was to examine the expression CD133 and CD24 in gastric cancers. Furthermore, their clinical significance was evaluated. Methods: Immunohistochemistry for CD133 and CD24 was performed on the tissue microarray of 388 gastric cancers. We retrospectively analysed the prognostic factors depending on the expression of CD133 and CD24. Results: In gastric cancers, 251 of the 381 cases (66%) tested were positive for CD133 expression and 122 of the 386 cases (32%) tested were positive for CD24 expression. CD133 expression was more present in well differentiated cancer (p=0.003). However other prognostic factors were not related with CD 133 & CD24 expression The survival rate according to CD133 & CD24 expression was not significant. Conclusions: We can figure out the potential presence of cancer stem cells in gastric cancers through confirming the positive expression of CD133 & CD24. However CD expressions didn°Ot show close relationship with prognostic factors and survival rate of gastric cancer.