Papers by George Theodoropoulos
Abstract Abstract Abstract AIM: The significance of preoperative serum IL-6, TNFα and CRP levels ... more Abstract Abstract Abstract AIM: The significance of preoperative serum IL-6, TNFα and CRP levels in the progression of colorectal cancer (CRC) has not been fully elucidated. Our intention was to investigate their role and identify their prognostic significance. METHODS: The IL-6, TNFα and CRP levels were measured in 74 CRC patients and the relationships between their elevations and both
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Ectopic thyroid tissue in the lower neck with a coexisting normally located multinodular goiter i... more Ectopic thyroid tissue in the lower neck with a coexisting normally located multinodular goiter is a rare entity. We present a 27-year old asymptomatic woman with a recent history of a painless mass in the left side of her lower neck. Thyroid function tests were normal. An ultra- sound of her neck showed a multinodular goiter and a 3.4 cm
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International journal of cancer. Journal international du cancer, Jan 4, 2015
A small number of common susceptibility loci have been identified for pancreatic cancer, one of w... more A small number of common susceptibility loci have been identified for pancreatic cancer, one of which is marked by rs401681 in the TERT - CLPTM1L gene region on chr5p15.33. Since this region is characterized by low linkage disequilibrium (LD), we sought to identify additional SNPs could be related to pancreatic cancer risk, independently of rs401681. We performed an in-depth analysis of genetic variability of the telomerase reverse transcriptase (TERT) and the telomerase RNA component (TERC) genes, in 5,550 subjects with pancreatic cancer and 7,585 controls from the PANcreatic Disease ReseArch (PANDoRA) and the PanScan consortia.We identified a significant association between a variant in TERT and pancreatic cancer risk (rs2853677, OR=0.85; 95% CI=0.80-0.90, P=8.3x10(-8) ). Additional analysis adjusting rs2853677 for rs401681 indicated that the two SNPs are independently associated with pancreatic cancer risk, as suggested by the low LD between them (r(2) =0.07, D'=0.28). Three ...
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The American surgeon, 2015
Lateral internal sphincterotomy (LIS) is considered the surgical treatment of choice for chronic ... more Lateral internal sphincterotomy (LIS) is considered the surgical treatment of choice for chronic anal fissure (CAF). Flap techniques for fissure coverage have the advantage of primary wound healing, potentially providing better functional results and faster pain relief. The standard surgical strategy for CAF consisting of conventional LIS (CLIS) up to the dentate line was modified by "tailoring" the LIS to the apex of the CAF, but never greater than 1 cm, and by advancing a dermal flap for coverage of the CAF (LIS + flap) after fissurectomy. Thirty consecutive patients who underwent "LIS + flap" were compared with 32 patients who had been previously treated by CLIS. A modified, trapezoid-like Y-V flap from perianal skin was advanced into the CAF base. Pain at the first postoperative day, pain at defecation during the first week, postoperative use of analgesics, and time for patients' pain relief were significantly less at the "LIS + flap" group (P &...
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The American surgeon, 2014
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The American surgeon, 2013
Submucosal hemorrhoidectomy (Parks' procedure) is a recognized method for treating acute hemo... more Submucosal hemorrhoidectomy (Parks' procedure) is a recognized method for treating acute hemorrhoidal crisis. Anoderm preservation has been stressed in various techniques described for elective or emergency excisional hemorrhoidal management. Mucopexy techniques have been proven useful as an adjunct to minimally resectional techniques. A modified submucosal technique with anoderm preservation and mucopexy was applied to 45 patients who presented on an emergency basis with hemorrhoidal crisis. External piles were minimally removed, the minimum possible amount of diseased mucosa was excised, a linear incision was used at the anoderm to enter the subanodermal/mucosal plane to achieve the submucosal excision, and a mucopexy was added at the approximation of the mucosal flaps. Postoperative morbidity was minimal and pain after the procedure remained at acceptable levels. This technique allows for an excision limited to the pathology with important anatomic tissue preservation. This r...
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World journal of gastrointestinal surgery, Jan 27, 2011
Transanal excision of rectal polyps with laparoscopic instrumentation and a single incision lapar... more Transanal excision of rectal polyps with laparoscopic instrumentation and a single incision laparoscopic port is a novel technique that uses technology originally developed for abdominal procedures from the natural orifice of the rectum. Transanal endoscopic microsurgery (TEM) is a well established surgical approach for certain benign or early malignant lesions of the rectum, under specific indications. Our technique is a hybrid technique of transanal surgery, a reasonable method for polyp resection without the need of the sophisticated and expensive instrumentation of TEM which can be applied whenever endoscopic or conventional transanal surgical removal is not feasible.
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The American surgeon, 2010
This study was designed to prospectively evaluate health-related quality of life in a homogeneous... more This study was designed to prospectively evaluate health-related quality of life in a homogeneous Mediterranean group of colorectal cancer patients. Ninety-five colorectal cancer patients were preoperatively assessed and followed-up with by skilled investigators using the Short Form-36 Health Survey questionnaire. Overall, patients showed deterioration in all domains, except for pain, when baseline values were compared with 3 and 6 months postoperatively (P = 0.0001). A significant improvement of all Short Form-36 Health Survey questionnaire domains was noted between 6 and 12 months (P = 0.0001). Scores for general health, pain, emotional well-being, and role limitations due to emotional problems at 1 year were shown better than preoperative (P < 0.001). Improved scores in role limitations due to physical health and emotional problems were found at baseline and at 1 year, when laparoscopic were compared with open resections (P < 0.05). Patients that received chemotherapy prove...
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World journal of gastroenterology : WJG, Jan 7, 2009
We report a case of jejunoileal intussusception in a 42-year-old patient with Crohn's disease... more We report a case of jejunoileal intussusception in a 42-year-old patient with Crohn's disease caused by a gastrointestinal stromal tumor. The patient complained of vague diffuse abdominal pain for a period of 4 mo. Intussusception was suspected at computer tomography and magnetic resonance imaging scans. Segmental resection of the small intestine was performed. Pathological examination of the surgical specimen revealed a gastrointestinal stromal tumor as well as aphthous ulcerations and areas of inflammation, which were characteristic of Crohn's disease. This is the first report of small bowel intussusception due to a gastrointestinal stromal tumor coexisting with Crohn's disease.
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British journal of cancer, 1984
Serum levels of alpha 1-antitrypsin (alpha 1 AT) were measured by radial immunodiffusion and phen... more Serum levels of alpha 1-antitrypsin (alpha 1 AT) were measured by radial immunodiffusion and phenotypes were determined by electrofocusing in acrylamide gel in 39 patients with hepatocellular carcinoma (HCC) positive for serum hepatitis B surface antigen (HBsAg), 41 patients with HCC negative for serum HBsAg, and 160 age- and sex-matched hospital controls. There was no difference between the control series and either of the two HCC groups with respect to alpha 1 AT phenotype pattern; also, there was no evidence of association between HCC and either the M2 allele or any of the alpha 1 AT deficiency phenotypes. However, HCC cases negative for HBsAg had significantly higher serum alpha 1 AT values (mean 665 +/- 26 mg 100 ml-1) than HCC cases positive for HBsAg (mean 571 +/- 23 mg 100 ml-1), who in turn, had significantly higher alpha 1 AT values than hospital controls (mean 434 +/- 13 mg 100 ml-1). These results indicate that in Greece, as in other high HCC incidence countries, genetic...
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Journal of Surgical Research, 2015
Crohn disease is still incurable. Compounds with anti-inflammatory and/or antioxidative effects a... more Crohn disease is still incurable. Compounds with anti-inflammatory and/or antioxidative effects are tested in various preclinical models of the disease. Our aim was to investigate the effects of sildenafil and lazaroid U-74389G in an experimental rat model of trinitrobenzenesulfonic acid-induced colitis. Trinitrobenzenesulfonic acid was instilled into the colon of all male Wistar rats except for the rats belonging to the first group. For 6 days, the animals in group 3 were administered daily sildenafil orally, the rats in group 4 were administered daily U-74389G intravenously, and the rats in group 5 were coadministered daily sildenafil orally and intravenous U-74389G. The rats in groups 1 and 2 were not administered any treatment. During the study, the weights were recorded as a marker of clinical condition. The colon damage was evaluated using macroscopic colon mucosal damage index (CMDI), microscopic (Geboes score), and biochemical methods (tissue tumor necrosis factor [TNF]-α and malondialdehyde [MDA]). Sildenafil reduced TNF-α tissue levels and increased body weight. U-74389G reduced TNF-α, the macroscopic index of mucosal damage score (CMDI) and increased body weight. The combined treatment with sildenafil and U-74389G reduced tissue levels of both TNF-α and MDA, lowered CMDI and microscopic Geboes score, and increased body weight. U-74389G demonstrated a significant anti-inflammatory activity related to its ability to reduce colonic TNF-α, CMDI score, and improve weight change. We confirmed that sildenafil has anti-inflammatory capacity by reducing colonic TNF-α and by improving body weight. Finally, the combined treatment showed superior effects by reducing colonic TNF-α, colonic MDA, CMDI score, Geboes score, and by improving weight.
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Journal of Cancer Research and Clinical Oncology, 2010
Purpose and methods Vascular endothelial growth factor (VEGF) overexpression has been associated... more Purpose and methods Vascular endothelial growth factor (VEGF) overexpression has been associated with advanced stage and poor survival in several cancers. Additionally, endoglin was proposed as a marker of neovascularization in solid malignancies. The aim of this study was to evaluate the association between the VEGF and endoglin expression in colorectal carcinoma patients, as well as to correlate the VEGF and
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The Breast, 2011
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The Breast, 2011
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Nature genetics, 2014
We performed a multistage genome-wide association study including 7,683 individuals with pancreat... more We performed a multistage genome-wide association study including 7,683 individuals with pancreatic cancer and 14,397 controls of European descent. Four new loci reached genome-wide significance: rs6971499 at 7q32.3 (LINC-PINT, per-allele odds ratio (OR) = 0.79, 95% confidence interval (CI) 0.74-0.84, P = 3.0 × 10(-12)), rs7190458 at 16q23.1 (BCAR1/CTRB1/CTRB2, OR = 1.46, 95% CI 1.30-1.65, P = 1.1 × 10(-10)), rs9581943 at 13q12.2 (PDX1, OR = 1.15, 95% CI 1.10-1.20, P = 2.4 × 10(-9)) and rs16986825 at 22q12.1 (ZNRF3, OR = 1.18, 95% CI 1.12-1.25, P = 1.2 × 10(-8)). We identified an independent signal in exon 2 of TERT at the established region 5p15.33 (rs2736098, OR = 0.80, 95% CI 0.76-0.85, P = 9.8 × 10(-14)). We also identified a locus at 8q24.21 (rs1561927, P = 1.3 × 10(-7)) that approached genome-wide significance located 455 kb telomeric of PVT1. Our study identified multiple new susceptibility alleles for pancreatic cancer that are worthy of follow-up studies.
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International Journal of Gastrointestinal Cancer, 2002
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Preventive Veterinary Medicine, 2011
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World journal of gastroenterology : WJG, Jan 21, 2006
To investigate the association between common single nucleotide polymorphisms (SNPs) in inflammat... more To investigate the association between common single nucleotide polymorphisms (SNPs) in inflammatory response-related genes such as interleukin (IL)-6, IL-8, tumor necrosis factor alpha (TNFalpha), peroxisome proliferators-activated receptor gamma (PPARgamma), intercellular adhesion molecule-1 (ICAM-1) and the risk of colorectal cancer (CRC) in a group of Greek patients. The study group consisted of 222 CRC patients and 200 healthy controls. Genotyping was performed using allele-specific PCR of PRC-RFLP and the results were confirmed by sequencing. We studied the association of SNPs in the IL-6 (-174G>C), IL-8 (-251T>A), TNFalpha (-308G>A), ICAM-1 (R241G and K469E), and PPARgamma (Pro12Ala) genes and the risk of CRC. The IL-6 -174G, R241 and K469 alleles of ICAM-1 were associated with increased risk of CRC (OR = 1.77, 95% CI: 1.34-2.34; OR = 1.83, 95% CI: 1.23-2.72; and OR = 1.35, 95% CI: 1.03-1.77 respectively). The IL-8 and TNFalpha polymorphisms had no effect. Whereas th...
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Journal of Surgical Oncology, 2006
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Papers by George Theodoropoulos