Wyniki wyszukiwania - Biblioteka Nauki

1

Higher Apoptosis Index and Proliferation Index in Colonocytes of Patients with Ulcerative Colitis in Remission

100%

Buczyński J. , Spychalski M. , Ławska-Wierzchniewska A. , Dziki A.

Polish Journal of Surgery

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2012

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tom 84

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nr 6

271-275

EN

Ulcerative colitis (UC) is a inflammatory disease of large bowel. The amount of people suffering from UC increases from year to year. Pathogenesis of this affection is still not entirely clear. Mechanisms of proliferation and apoptosis in colonocytes in the course of the disease are defectedThe aim of the study was to assess the rate of proliferation and intensity of apoptosis in colonocytes in patients with diagnose UC.Material and methods. Colon pathological samples taken from patients with diagnosed ulceraive colitis were examined. Patients were in both clinical and endoscopic remission and were treated with mesalazin. They were patient of Department of General and Colorectal Surgery. To estimate proliferation index dye with monoclonal antibody against Ki67. To determine apoptosis level immunohistochemistry with antybody against Bax was used.Results. Average Ki-67 in the test group was 42,13%, the largest value amounted to 57% and the lowest of 33%. Average value of Bax was 1.47 and ranged between 0-3. High index of bax appear not only in the bottom of the crypt, but also at their outlet.Conclusions. In ulecerative colitis genetic and immunological disturbances occur despite treatment. Mesalazine acting only on certain routes associated with the UC holds the remission, without, however "the molecular remission". Thus, it appears that the results of our research are another proof of the necessary caution in weaning support treatment.

2

Genetic Variations of the CTNNA1 And The CTNNB1 Genes in Sporadic Colorectal Cancer in Polish Population

75%

Sygut A. , Przybyłowska K. , Ferenc T. , Dziki Ł. , Spychalski M. , Mik M. , Dziki A.

Polish Journal of Surgery

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2012

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tom 84

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nr 11

560-564

EN

Experimental as well as clinical observations have demonstrated that the E-cadherin/catenin complex is a powerful inhibitor of invasion. Abrogation of this pathway is implicated in the carcinogenesis of several malignancies, especially colorectal cancer. The aim of the study was to determine the CTNNA1 and the CTNNB1 mutations and its relationship to clinical and pathological features of sporadic colorectal cancer (CRC) in Polish patients. Material and methods. Paired tumor and normal tissue samples from 110 sporadic CRC patients undergoing resective surgery were prospectively studied for the alpha catenin (CTNNA1) gene and beta catenin (CTNNB1)gene mutations by PCR/single strand conformation polymorphism (SSCP). Results. The CTNNA1 gene alteration in exon 7 were detected in 4 samples and in exon 3 of CTNNB1 gene were found in 3 samples. There was a trend at the limit of statistical significance associating younger age at diagnosis (<50) with CTNNA1 and the CTNNB1 mutations. The mutation of CTNNB1 seemed to occur more frequently in the proximal colon than distal. The CRC patients with CTNNA1 mutation had a significantly increased lymph node metastasis. On the other hand, there was no correlation between mutations and the other clinical variables (e.g. sex, grade and depth of invasion). Conclusion. Although we found a low frequency of mutations in the CTNNA1 and the CTNNB1 genes, but the analysis the relationship with clinical and pathological features of CRC patients may indicated an association of these mutations with the risk and progression of CRC.

3

Celecoxib - A Selective Cyclooxygenase-2 Inhibitor Exhibits Dose - Dependent Chemopreventive Activity on an Animal Model of Colorectal Cancer*

75%

Spychalski M. , Dziki Ł. , Buczyński J. , Kulig A. , Sporny S. , Dziki A.

Polish Journal of Surgery

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2008

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tom 80

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nr 5

248-255

EN

Colorectal cancer (CRC) is still one of the unresolved issues in medicine. Despite constant improvements in diagnosis and treatment, the prognosis for CRC is unsatisfactory. In recent years, much attention has been paid to experiments concerning chemoprevention of CRC.The aim of the study was evaluation of the effectiveness of celecoxib, a selective Cyclooxygenase-2 (COX-2) inhibitor of chemically-induced CRC carcinogenesis in Fisher F344 rats.Material and methods. Forty-five four-week old male F344 rats were randomized into four groups. In Groups 1, 2, and 3, we induced the CRC carcinogenesis through two subcutaneous injections of Azoxymethane in doses of 20 mg/kg. Rats from groups 1 and 2 were treated with celecoxib in doses of 10 and 30 mg/kg from the start of the experiment. Group 4 was a negative control. The experiment ended in the 26th week. We assessed the following parameters: the number of Aberrant Crypt Foci (premalignant lesions in colons) and the immunoexpression indexes: COX-2, Vascular Endothelial Growth Factor (VEGF), and c-myc.Results. Celecoxib reduced the ACF number. The ACF reduction was dose-dependent. The median ACF number per field of vision was as follows for each of the groups: 1.7, 0.75, 3.2, and 0.2. Celecoxib, irrespective of the dose, reduced the VEGF immunoexpression index. We did not observe a reduction of COX-2 or c-myc immunoexpression in the celecoxib groups.Conclusions. In this experiment, we proved that celecoxib possessed chemopreventive activity. Carcinogenesis inhibition by selective COX-2 inhibitor was dose-dependent. We demonstrated that celecoxib hidners angiogenesis, expressed as VEGF immunoexpression. We indirectly confirmed the hypothesis of a celecoxib COX-2 independent pathway mechanism of action.

4

Evaluation of the Early Results of a Loop Stoma with a Plastic Rod in Comparison to a Loop Stoma Made with a Skin Bridge

63%

Dziki Ł. , Mik M. , Trzciński R. , Buczyński J. , Darnikowska J. , Spychalski M. , Wierzbicka A. , Dziki A.

Polish Journal of Surgery

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2015

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tom 87

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nr 1

31-34

EN

Loop stoma allows reducing the percentage of anastomotic leak and re-operation caused bythis complication. Our department has performed the loop stoma on a skin bridge since 2011. The aim of the study was to evaluate the early results of treatment after the skin bridge loop stoma creation in comparison with the stoma made on a plastic rod. Both groups had 20 patients. Material and methods. The study involved 40 patients with ileostomy, operated 2010-2013. We evaluated 20 patients with a loop ileostomy on a plastic rod, compared to 20 other patients with a skinbridge ileostomy. The study included 24 men and 16 women. Median age was 68.3. All evaluated patients were previously operated due to rectal cancer. Results. It has been shown that the surgical site infection is more common in the group with a plastic rod (5 vs 1 patient). Inflammation of the skin around the stoma occurred in 18 patients (90%) in the first group, while no such complication was found in patients in the second group. The average number of exchanged ostomy wafers was 2,9 per weekin the first group of patients, and 1,1 in the second group (p 0,05). Conclusions. The creation of the skin bridge stoma allows for tight fit of the ostomy appliance immediately after surgery completion. The equipment has stable and long-lasting contact with the skin, no skin inflammatory changes occur. Also the surgical site infection rates are lower in this group of patients. As perioperative patient does not require an increased number of ostomy appliance, the cost of treatment can be considered as an important aspect.

5

Large Colorectal Polyps - Endoscopic Polypectomy as an Alternative to Surgery

63%

Spychalski M. , Buczyński J. , Cywiński J. , Dziki Ł. , Langner E. , Sygut A. , Trzciński R. , Dziki A.

Polish Journal of Surgery

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2011

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tom 83

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nr 10

531-536

EN

Endoscopic polypectomy of colorectal polyps is a common procedure. However, endoscopic treatment of large polyps (those with a diameter exceeding 2 cm) remains questionable. There is a serious risk of colorectal carcinoma presence inside these lesions, which eventually would require surgical intervention. Apart from this fact endoscopic polypectomy of large polyps is connected with substantial risk of complications, such as perforation and bleeding. Many patients with large colorectal polyps are qualified for surgical intervention.The aim of the study was to determine the efficacy and safety of polypectomy of large colorectal polyps.Material and methods. The study presented results of endoscopic treatment in case of patients with large colorectal polyps at the Department of General and Colorectal Surgery, Medical University in Łódź. Patients were admitted to the hospital during the period between January, 2008 and January, 2010. The following parameters were analysed: location of polyps, percentage of high grade dysplasia, complete excision rate, and complications connected with polypectomy procedures.Results. During the analyzed period of time 488 endoscopic polypectomies were performed. Forty-three large colorectal polyps were removed (8.8%). Seven (16.3%) of them were classified as flat polyps. Out of 488 removed polyps, 39 were classified as adenomas with high grade dysplasia (7.9%), while 16 were large-exceeding 2 cm (37.2%). Considering the group of large polyps no invasive carcinoma case was detected. The radical excision rate for large pedunculated polyps was obtained in 88.8% (32/36) of cases. In case of flat adenomas the above-mentioned parameter was lower - 57.1% (4/7). During polypectomy of large colorectal polyps one perforation was observed during the excision of a flat cecal polyp. In two cases immediate bleeding occurred (2/43). In both cases endoscopic treatment of bleeding proved sufficient.Conclusions. Endoscopic polypectomy of large pedunculated polyps is a safe and efficient method, which makes it a rationale alternative for surgery. Polypectomy of flat adenomas is connected with a lower radical excision rate and higher risk of perforation.