Sławomir Mrowiec

Medical University of Silesia in Katowice, Catowice, Silesian Voivodeship, Poland

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Publications (12)12.91 Total impact

  • Advances in anatomic pathology 03/2012; 19(2):125-7. · 3.22 Impact Factor
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    ABSTRACT: Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal neoplasms located in the alimentary tract. Our aim was to assess the influence of prognostic factors on survival in patients surgically treated for GISTs. One hundred and five patients treated between January 1989 and December 2008 were available for study. A retrospective analysis of prognostic factors (age, gender, mitotic index, tumor location, tumor size, risk of malignant behavior, and coexisting other neoplasm) was performed. Univariate and multivariate survival analyses were undertaken. Univariate analyses revealed the importance of patient gender (p = 0.007), disease location (p = 0.055), mitotic index (p = 0.054) and coexistence with other neoplasms (p = 0.004). However, multivariate analysis showed 3 independently statistically significant factors: coexistence with other neoplasm (RR = 3.53, p = 0.004), male gender (RR = 2.60, p = 0.011) and mitotic index ≥10/50 HPF, (RR = 2.60, p = 0.042). Our study has shown that male gender, a high mitotic index ≥10/50 HPF, and coexistence with other malignant neoplasms were independent poor prognostic factors in patients with GIST. The presence of middle or lower gut disease location leads to an increased risk of mortality when compared with the upper gut.
    European Surgical Research 12/2011; 48(1):3-9. · 0.75 Impact Factor
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    ABSTRACT: Early onset pancreatic cancer (EOPC) constitutes less than 5% of all newly diagnosed cases of pancreatic cancer (PC). Although histopathological characteristics of EOPC have been described, no detailed reports on precursor lesions of EOPC are available. In the present study, we aimed to describe histopathological picture of extratumoral parenchyma in 23 cases of EOPCs (definition based on the threshold value of 45 years of age) with particular emphasis on two types of precursor lesions of PC: pancreatic intraepithelial neoplasia (PanIN) and intraductal papillary mucinous neoplasms (IPMNs). The types, grades, and densities of precursor lesions of PC were compared in patients with EOPCs, in young patients with neuroendocrine neoplasms (NENs), and in older (at the age of 46 or more) patients with PC. PanINs were found in 95.6% of cases of EOPCs. PanINs-3 were found in 39.1% of EOPC cases. Densities of all PanIN grades in EOPC cases were larger than in young patients with NENs. Density of PanINs-1A in EOPC cases was larger than in older patients with PC, but densities of PanINs of other grades were comparable. IPMN was found only in a single patient with EOPC but in 20% of older patients with PC. PanINs are the most prevalent precursor lesions of EOPC. IPMNs are rarely precursor lesions of EOPC. Relatively high density of low-grade PanINs-1 in extratumoral parenchyma of patients with EOPC may result from unknown multifocal genetic alterations in pancreatic tissue in patients with EOPCs.
    Archiv für Pathologische Anatomie und Physiologie und für Klinische Medicin 03/2011; 458(4):439-51. · 2.68 Impact Factor
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    ABSTRACT: The aim of our study was to identify and describe potential inconsistencies between two alternative staging systems of pancreatic neuroendocrine neoplasms (pNENs)--the European Neuroendocrine Tumor Society (ENETS) system (2006) and the American Joint Committee on Cancer/Union for International Cancer Control (AJCC-UICC) system (2010). To address this issue, we performed a retrospective clinico-pathological study of 50 cases of pNENs. We found 9 (18%) cases of ENETS/AJCC-UICC discrepancies regarding the primary tumor stage. They included 7 cases of T2/T3 disagreement and 2 cases of T3/T4 disagreement. In addition, we discussed the issue of potential T1/T2 discrepancy (however, we did not observe any such a case). Another inconsistency was related to the application of different stage prognostic groupings between both systems. In conclusion, the discrepancies between ENETS and AJCC-UICC staging systems for pNENs are relatively frequent and heterogeneous. We believe that they should be rigorously recognized. This is necessary for the evaluation of prognostic factors and the effectiveness of therapeutic options used in patients with pNENs.
    Pathology - Research and Practice 02/2011; 207(4):220-4. · 1.21 Impact Factor
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    ABSTRACT: Serous neoplasms (SN) of the pancreas account for 1-2% of all pancreatic tumours. Six morphological variants of SN were previously recognized: serous microcystic (cyst)adenoma, serous macrocystic (cyst)adenoma, von Hippel-Lindau-associated serous cystic neoplasm, solid serous adenoma/neoplasm, mixed serous-neuroendocrine neoplasm and serous cystadenocarcinoma. It was recently postulated that SN shows a continuous spectrum of morphological patterns rather than distinct clinico-pathological subtypes. To address this issue, we performed a detailed review of 40 SN cases diagnosed at our institution between 1989 and 2011. We found 11 cases of serous microcystic (cyst)adenoma, 5 cases of serous macrocystic (cyst)adenoma, and a single case of von Hippel-Lindau-associated serous cystic neoplasm. Apart from that, we found 20 cases of SN which showed features of both microcystic and macrocystic (cyst)adenomas, 2 cases of small 'incipient' SN and a single case of a mixed microcystic and solid adenoma. In conclusion, we showed that 'borderline' lesions among SNs truly exist and are not rare. The reason for such a wide diversity of morphological patterns of SN remains unknown.
    Polish journal of pathology: official journal of the Polish Society of Pathologists 01/2011; 62(4):206-17. · 0.49 Impact Factor
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    ABSTRACT: Intraductal oncocytic papillary neoplasms (IOPN) are rare tumors of the pancreatic and biliary ductal system. It is not absolutely clear if the molecular and clinicopathologic characteristics of IOPN differ significantly from other related lesions, namely intraductal papillary mucinous neoplasms (IPMN). Therefore it is not clear if it is reasonable to consider IOPN as a separate diagnostic and clinical entity. In order to describe the clinicopathologic characteristics of IOPN and to compare them with the IPMN profile, we performed a systematic review of the literature and additionally studied five previously unreported IOPN cases. IOPN differ from IPMN by lack of K-ras gene mutations in all studied cases. Several differences in the clinical and biological profile between IOPN and IPMN exist, but they are of quantitative rather than of qualitative nature. Additionally, pancreaticobiliary or gastric-foveolar IPMN components may coexist with IOPN component within a single lesion, which suggests at least a partial relation of the pathogenetic pathways of IPMN and IOPN. Importantly, the pathogenesis of accumulation of mitochondria and oxyphilic appearance of IOPN remains unknown. At present, there are no reliable criteria other than histopathological picture and K-ras gene status to differentiate IOPN from IPMN. In particular, no clear differences in optimal treatment options and prognosis between these tumors are known. Further studies are needed to clarify the biology of IOPN and to establish their position in clinicopathologic classifications of pancreatic tumors.
    Journal of hepato-biliary-pancreatic sciences. 05/2010; 17(3):246-61.
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    ABSTRACT: To develop a method of gross examination of pancreaticoduodenectomy specimens with pancreatic ductal adenocarcinoma, allowing adequate assessment of the entire pancreatic surface as a surgical margin, which would not affect the lymph node yield. We retrospectively compared the R1 rates (i.e., proportions of patients with microscopic residual tumour at surgical margins) and lymph node yield in a series of 67 consecutive cases of pT3 ductal adenocarcinomas diagnosed in pancreaticoduodenectomy specimens during three different periods of time and sampled using three different approaches: (1) period 2006-2007, when the pancreatic surface (except for the transection margin and superior mesenteric artery margin) was not examined; (2) period January-September 2008, when the posterior pancreatic surface (posterior circumferential radial margin) was examined using an improved method based on sampling of 2.0-2.5 mm thick consecutive slices perpendicular to the duodenal axis; and (3) period October 2008 - June 2009, when the whole surface of the pancreatic head was sampled using the approach mentioned above. The R1 rates in three consecutive time periods were 23.5%, 40% and 53.8%, respectively. Median numbers of retrieved peripancreatic lymph nodes were 11.0, 12.0 and 14.0, respectively. The newly proposed approach allowed adequate assessment of the entire pancreatic head surface as a surgical margin and reduced the risk of under-detection of R1 status. Moreover, this approach did not affect the number of peripancreatic lymph nodes examined.
    Pathology 02/2010; 42(2):138-46. · 2.66 Impact Factor
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    ABSTRACT: There are a few studies concerning epidemiology of pancreatic ductal adenocarcinoma (PDAC) in the Polish population. Analysis of age distribution patterns of patients with different types of cancer may be useful for studying their specific biology. In the present study we aimed to describe age distribution patterns of 580 patients with PDAC diagnosed in one centre during a 25-year period. All the histopathological diagnoses were re-reviewed using current histopathological diagnostic criteria. Age distributions of selected subpopulations of patients (defined based on gender, potential tumour resectability and type of the surgery) were compared using mean values, medians, age frequency density plots and logarithmic plots of age-specific frequencies. The mean and median values of patients' age were 60.8 y and 61.0 y, respectively. Females were approximately 2 y older than males at the time of PDAC diagnosis. Females with non-resectable PDAC were approximately 2 y older than females with resectable tumours. Mean age values of males with non-resectable and resectable PDAC were similar. Patients treated with pancreaticoduodenectomy were approximately 2 y older than patients undergoing other types of resections. Age distribution density plots showed that some subgroups of patients studied were somewhat heterogeneous and might include several yet poorly recognized clinico-pathological entities. Logarithmic plots of age-specific frequencies showed that PDAC epidemiology is in concordance with a multistage theory of carcinogenesis. PDAC is an age-dependent cancer. Single-institutional pathology-oriented cancer epidemiological databases may add some information to population-based cancer registries.
    Polish journal of pathology: official journal of the Polish Society of Pathologists 01/2010; 61(2):65-77. · 0.49 Impact Factor
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    ABSTRACT: The aim of this report is to describe two cases of lymphoepithelial cysts (LEC) of the pancreas: 1. LEC coexisting with primary gastric lymphoma, 2. an incidental finding of LEC during imaging examination. 1. A 47-year old man complaining of epigastric pain showed a 2 x 1.5 cm cyst of the pancreatic head on computed tomography (CT) scan. Endoscopic biopsy revealed infiltration by a poorly differentiated neoplasm, probably carcinoma. The patient underwent gastrectomy with lymphadenectomy D 2. The pancreatic lesion was excised. Diffuse large B-cell lymphoma (pT4N1 M0BX) and LEC were diagnosed. Patient refused adjuvant therapy. No symptoms of recurrence were observed during 24-months follow-up period. 2. 50-year-old male with non-specific urinary complaints revealed a 4.2 x 3.5 cm cyst in the body of pancreas on CT scan. The cyst was excised and LEC was diagnosed. Patient had not reported any complaints during 42 months follow-up period. To the best of the authors' knowledge, the first of two presented cases is the first described case of coexistence of LEC of the pancreas and gastrointestinal lymphoma. It is difficult to ascertain if there is any causative relationship or if this coexistence is purely incidental. Incidental pancreatic cysts are more and more common finding in surgical practice.
    Zeitschrift für Gastroenterologie 11/2008; 46(10):1188-93. · 1.41 Impact Factor
  • Polish Journal of Surgery. 01/2008; 80(6):321-330.
  • Polish Journal of Surgery. 01/2008; 80(7):351-363.
  • Polish Journal of Surgery. 01/2008; 80(7):343-350.