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  • 1
    ISSN: 1530-0358
    Keywords: Beta-catenin ; Immunohistochemistry ; Metastasis ; Predictive value ; Prognosis ; Rectal cancer ; Tumor marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract PURPOSE: Adenomatous polyposis coli protein, glycogen synthetase kinase-3-beta, T cell transcription factor/lymphoid enhancer-binding factor, and beta-catenin modulate cell differentiation and proliferation via the expression of effector genes. It has recently been postulated that betacatenin is a potent oncogene of sporadic colorectal carcinogenesis and a prognostic tumor marker. Our aim was to investigate whether the nuclear overexpression of betacatenin, possibly caused by mutations in exon 3 of betacatenin (CTNNB1), is correlated with distant metastatic spread or disease-free survival in rectal carcinoma. METHODS: Immunohistochemical analysis was performed with an anti-beta-catenin-monoclonal antibody on paraffin sections of two groups of patients (n=2 × 77) with rectal carcinoma curatively treated by surgery alone. The patients selected were all free of local disease, to exclude surgical influence. Patient groups were matched for age, gender, International Union Against Cancer stage, and year of operation (1982 to 1991) and differed only in subsequent metachronous distant metastatic spread. Follow-up was prospective (median, 9.6 years). Three staining patterns were defined: membranous (normal), diffuse cytoplasmic (pathologic), and intense nuclear staining (pathologic). When intense nuclear staining was defined, the specimen was microdissected. Then, DNA was isolated, polymerase chain reaction-amplified, and sequenced to detect mutations in exon 3. RESULTS: Nuclear overexpression of beta-catenin correlated neither with distant metastatic spread (chisquared, 0.37;P=0.79) nor with disease-free survival (log-rank with trend,P=0.62). No mutations were found in the area of the serine/threonine-kinase glycogen synthetase kinase-3-beta-phosphorylation site in exon 3 (CTNNB1) of beta-catenin. CONCLUSION: Although beta-catenin seems to play an important role in early colorectal carcinogenesis, its value as a prognostic marker is questionable. It must be assumed that metastatic ability is determined by other factors than the disturbance of the beta-catenin T cell transcription factor/lymphoid enhancer-binding factor cascade and that other mechanisms might cause the observed nuclear translocation of beta-catenin.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0385
    Keywords: Schlüsselwörter: Inkontinenz ; Rectumcarcinom ; Manometrie ; Prognose ; Anus. ; Keywords: Incontinence ; Rectal cancer ; Anorectal manometry ; Prognosis ; Anus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract. Aim: To determine clinical and physiologic parameters enabling the prognosis of continence after protective ileostomy closure secondary to rectal resection for rectal cancer. Method: Patients who had undergone rectal resection (n = 65, of whom 24 had had radiochemotherapy) were evaluated by clinical examination, anorectal manometry and orthograde contrast enema before ileostomy closure. Continence was evaluated by clinical findings 91 ± 52 weeks after stoma closure with the help of standardized questionaires and classified according to the Wexner continence score. The relationship between findings before stoma closure and continence score was calculated with Pearson's correlation coefficient. Results: Correlations were found to be significant between the continence score and the level of anastomosis (r = –0.58, p 〈 0.001), median resting pressure (r = –0.52, p 〈 0.001), rectal compliance (r = –0.43, p 〈 0.001). Additionally, radiochemotherapy impairs continence (p = 0.0001). Correlations were not significant between continence and functional sphincter length, squeeze pressure, threshold for perception, urge and maximal tolerable volume, and continence for semiliquid contrast medium. Conclusion: Incontinence after rectum resection is multifactorial: the level of anastomosis, resting pressure, rectal compliance and radiochemotherapy all play a dominant role. Based on these findings, the continence score can be calculated before closure of a diverting ileostomy by applying multivariate analysis with the help of the following formula: Continence score = 18.23–0.94 · level of anastomosis – 0.18 · resting pressure + 3.72 · radiochemotherapy.
    Notes: Zusammenfassung. Ziel dieser Studie war eine Evaluation von klinischen und physiologischen Parametern zur Vorhersage des Kontinenzgrades nach Rückverlagerung der protektiven Loop-Ileostomie nach Rectumresektion wegen eines Carcinoms. Methode: 65 Patienten wurden klinisch mittels anorectaler Manometrie und orthograder Röntgenkontrastmitteldarstellung vor der Ileostomieresektion untersucht. Bei 24 Patienten war eine Radiochemotherapie durchgeführt worden. Der klinische Status wurden 91 ± 52 Wochen nach der Ileostomieresektion mittels eines standardisierten Fragebogens erhoben und der Kontinenzgrad nach dem Wexner-Kontinenzscore bewertet. Der postoperative Kontinenzscore wurde mit den Befunden vor Stomarückverlagerung korreliert und ein Pearson-Korrelationskoeffizient berechnet. Ergebnisse: Es ergab sich eine signifikante Korrelation des Kontinenzgrades mit der Anastomosenhöhe (r = –0,58, p 〈 0,001), dem mittleren Ruhedruck (r = –0,52, p 〈 0,001) und der rectalen Compliance (r = –0,43, p = 0,001). Die Kontinenz war nach Radiochemotherapie schlechter (p = 0,0001). Es fand sich keine signifikante Korrelation zwischen Kontinenzgrad und funktioneller Sphincterlänge, Kneifdruck, Perceptionsschwelle, Drangschwelle, maximal tolerablem Volumen und Kontinenz für semiliquides Kontrastmittel. Schlußfolgerung: Inkontinenz nach Rectumresektion ist multifaktoriell. Anastomosenhöhe, mittlerer Ruhedruck, rectale Compliance und Radiochemotherapie (RCT) spielen eine dominante Rolle. Basierend auf diesen Befunden ist über die Berechnung einer multivariaten Regressionsanalyse eine Abschätzung des Kontinenzgrades vor Ileostomieresektion mit folgender Formel möglich: Prognose-Wexner-Score = 18,23–0,94 · Anastomosenhöhe – 0,18 · Ruhedruck + 3,72 · RCT.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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