Expression of molecular markers detected by immunohistochemistry and risk of lymph node metastasis in stage T1 and T2 colorecrectal cancers / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To study the molecular risk factors of lymph node metastasis in stage T1 and T2 colorectal cancers by tissue microarray and immunohistochemistry techniques.</p><p><b>METHODS</b>Two hundred and three patients with stage T1 and T2 colorectal carcinoma who underwent radical surgery from 1999 to 2010 in our department were included in this study. Their clinicopathological data were retrospectively analyzed. Expression of the following 14 molecular markers were selected and assayed by tissue microarray and immunohistochemistry: VEGFR-3, HER2, CD44v6, CXCR4, TIMP-1, EGFR, IGF-1R, IGF-2, IGFBP-1, ECAD, MMP-9, RKIP, CD133, MSI. Chi-squared test and logistic regression were used to evaluate the variables as potential risk factors for lymph node metastasis.</p><p><b>RESULTS</b>The positive expression rates of biomarkers were as following: VEGFR-3 (44.3%), EGFR (30.5%), HER-2 (28.1%), IGF-1R (63.5%), IGF-2 (44.8%), IGFBP-1 (70.9%), ECAD (45.8%), CD44v6 (51.2%), MMP-9 (44.3%), TIMP-1 (41.4%), RKIP (45.3%), CXCR4 (40.9%), and CD133 (49.8%). The positive rate of MSI expression was 22.2%. Both univariate and multivariate analyses showed that VEGFR-3, HER-2, and TIMP-1 were significant predictors of lymph node metastasis. Univariate analysis showed that CD44v6 and CXCR4 were significant significant predictors of lymph node metastasis.</p><p><b>CONCLUSIONS</b>VEGFR-3, HER2 and TIMP-1 are independent factors for lymph node metastasis in stage T1 and T2 colorectal cancers.</p>

Study on associated biomarkers influencing recurrence, metastasis and prognosis in patients with gastrointestinal stromal tumors after complete resection / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To explore the associated biomarkers influencing recurrence, metastasis and prognosis in patients with gastrointestinal stromal tumors (GIST) after complete resection.</p><p><b>METHODS</b>Tumor tissue samples of 148 patients with GIST undergoing complete resection from January 1990 to December 2008 in Sun Yat-sen University Cancer Center were collected. The expressions of Ki-67, E-cadherin, MMP7, CD44, nm23, P53, survivin, Cyclin D1, COX-2, and VEGF in tumor tissue samples were detected by tissue microarray and immunohistochemistry (IHC). The association of above factors expressions with recurrence, metastasis and prognosis was examined.</p><p><b>RESULTS</b>Log-rank test showed that Ki-67, E-cadherin, MMP7, CD44, P53 and survivin were associated to disease-free duration after complete GIST resection (all P<0.05), and the Ki-67, E-cadherin, P53 and survivin were associated to overall survival (all P<0.05). Cox multivariate analysis revealed that disease-free survival was associated with Ki-67, CD44 and P53 (all P<0.05), and the overall survival was only associated with Ki-67 (P<0.05).</p><p><b>CONCLUSION</b>Ki-67, CD44 and P53 are closely associated with recurrence and metastasis after complete GIST resection, and Ki-67 can predict the prognosis of GIST.</p>

Surgical treatment and prognosis of gastrointestinal stromal tumor / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To investigate the outcome of surgical treatment for gastrointestinal stromal tumor(GIST) and the associated factors.</p><p><b>METHODS</b>A total of 277 patients with GIST underwent primary surgical treatment from January 1990 to February 2010 at the Cancer Center of Sun Yat-sen University. The clinical data were retrospectively reviewed and the pathological examination was reviewed. Follow-up was performed.</p><p><b>RESULTS</b>There were 176 males and 101 females. The age ranged from 20 to 81 years old (median,57). Location of the tumor included colorectum (n=28),small bowel(n=76), stomach(n=173). All the patients had en bloc resection, including local excision in 98 patients, organ resection in 64, and extended resection in 115. The 5-year survival rates were 83.5%, 71.9%, and 61.9% in the three different procedures, respectively, and the difference was not statistically significant(P>0.05). Cox model showed that the tumor size, recurrence and metastasis were independent risk factors associated with the prognosis in GIST patients(P<0.05).</p><p><b>CONCLUSIONS</b>Surgery remains the major approach for gastrointestinal GIST. Complete resection is the principal treatment. Extensive resection or extended lymph nodes dissection is not associated with improved survival.</p>