Nikolaos Vassos

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Neurofibromatosis type 1 (NF-1, Recklinghausen disease) is the most common hereditary multitumor syndrome with an incidence at birth of approximately 1:3000. However, the significant variation in the expression of the disease not infrequently precludes early diagnosis. As a consequence of non-familiarity with their frequency and wide clinicopathological(More)
Solid pseudopapillary neoplasm (SPN) of the pancreas is a rare tumor which typically affects young women without significant clinical symptoms. SPN usually shows an indolent behavior and only rare cases recur and/or metastasize after complete resection. We report our experience with four cases of SPN of the pancreas. All four patients were female with an(More)
Gastrointestinal stromal tumors of the vermiform appendix are rare. To date, only 11 cases have been reported in the English literature. Here, we present a new case of appendiceal gastrointestinal stromal tumor associated with complete situs inversus. A 48-year-old man was operated on due to appendicitis-like symptoms. Laparotomy revealed a ruptured(More)
BACKGROUND Over the past decade, several changes occurred in diagnostics, treatment and understanding of pathogenesis of gastrointestinal stromal tumours (GIST). However, their coexistence with other malignancies of different histogenetic origin remains a challenging issue. METHODS Patients diagnosed with GIST in a 10-years period were identified(More)
UNLABELLED Integrins are cell surface adhesion molecules (CAM) that regulate via intercellular and cell-matrix signaling various cellular processes including wound healing, cell differentiation, division, growth, migration and metastatic dissemination. Although a correlation between carcinogenesis and changes in integrin expression, especially β1 integrin,(More)
OBJECTIVE Metastasis is the major cause of death in colorectal cancer patients. Expression of certain miRNAs in the primary tumors has been shown to be associated with progression of colorectal cancer and the initiation of metastasis. In this study, we compared miRNA expression in primary colorectal cancer and corresponding liver metastases in order to get(More)
BACKGROUND Hibernoma is a rare benign fat-forming soft tissue tumor that differentiates similar to brown fat, hence an origin from remnants of fetal brown adipose tissue has been proposed. Mainly young adults are affected, usually without significant clinical symptoms. MATERIAL AND METHODS We report on four patients with hibernomas, who were treated at(More)
INTRODUCTION There is continuing controversy over the significance of prognostic factors in sporadic desmoid-type fibromatosis (DF). Further, only limited data is available in the literature concerning second recurrence in patients with recurrent DF. The purpose of this study was to identify prognostic factors influencing recurrence-free survival (RFS) and(More)
Corresponding author: Aristotelis Perrakis MD Department of Surgery University of Erlangen-Nuremberg Krankenhausstr. 12 91054 Erlangen, Germany Phone: +49 9131 85 33100 Fax: +49 9131 85 36294 E-mail: aristotelis.perrakis@ 1Department of Surgery, Western Attica General Hospital, Athens, Greece 2Department of Surgery, University of(More)
The two principal ways of metastases in gastrointestinal stromal tumors (GISTs) are diffuse intraabdominal spread and liver metastasis whereas lymph node metastases (LNM) are extremely rare. Accordingly, nodal dissection is generally not recommended for GISTs’ surgical treatment. We present two unique cases of GIST with synchronous and metachronous(More)