Location, morphology and invasiveness of lateral spreading tumors in the colorectum differ between two large cohorts from an eastern and western country.

BACKGROUND AND STUDY AIMS: Data from Japanese series show that surface morphology of laterally spreading tumors (LST) in the colon identifies lesions with different incidence and pattern of submucosal invasion. Such data from western countries are scarce. We compared clinical and histological features of LST in a western country and an eastern country, with special interest on mucosal invasiveness of LST, and investigated the effect of clinical factors on invasiveness in both countries. PATIENTS AND METHODS: Patients with LST lesions ≥20mm were included from a multicenter prospective registry in Spain and from a retrospective registry from the National Cancer Center Hospital East, Japan. The primary outcome was the presence of submucosal invasion in LST. The secondary outcome was the presence of high-risk histology, defined as high-grade dysplasia or submucosal invasion. RESULTS: We evaluated 1102 patients in Spain and 663 in Japan. Morphological and histological characteristics differed. The prevalence of submucosal invasion in Japan was six-fold the prevalence in Spain (Prevalence Ratio PR=5.66; 95%CI: 3.96, 8.08), and the prevalence of high-risk histology was 1.5 higher (PR=1.44; 95%CI: 1.31, 1.58). Compared to the granular homogeneous type and adjusted by clinical features, granular mixed, flat elevated, and pseudo-depressed types were associated with higher odds of submucosal invasion in Japan, whereas only the pseudo-depressed type showed higher risk in Spain. Regarding high-risk histology, both granular mixed and pseudo-depressed were associated with higher odds in Japan, compared with only the granular mixed type in Spain. CONCLUSION: This study reveals differences in location, morphology and invasiveness of LST in an eastern and a western cohort.

Abscesos hepáticos / Hepatic abscesses

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Factores asociados a la resección endoscópica completa del adenocarcinoma invasivo sobre adenoma de colon / Factors associated with complete endoscopic resection of an invasive adenocarcinoma in a colorectal adenoma

Antecedentes y objetivo: la polipectomía endoscópica puede permitir la resección con intención curativa del adenocarcinoma invasivo sobre adenoma de colon. Nuestro objetivo es determinar los factores asociados a la resección endoscópica completa del adenocarcinoma invasivo. Métodos: estudio retrospectivo observacional. Se incluyeron 151 individuos con un adenocarcinoma invasivo sobre adenoma resecado endoscópicamente entre 1999 y 2009. Se determinaron las variables relacionadas de forma independiente con la resección incompleta mediante una regresión logística. La relación se expresó como Odds Ratio (OR) y su intervalo de confianza (IC 95%). Resultados: los pacientes fueron predominantemente hombres (66,2%) y la edad media fue 68,03 ± 10,65 años. El 84% de las colonoscopias fueron completas y en el 60,3% se detectaron adenomas sincrónicos. La localización del adenocarcinoma fue principalmente distal (90,7%) y la morfología pediculada en el 75,5%. El tamaño endoscópico de la lesión fue de 22,61 ± 10,86 mm. En el 32,5% de las resecciones se inyectó suero salino submucoso, en el 73,5% se realizó en bloque y en el 8,6% la resección fue incompleta. Los factores que se asociaron de forma independiente a la resección endoscópica incompleta fueron el tamaño (mm) (OR 1,08, IC 95% 1,03-1,14; p = 0,002), la morfología no pediculada (OR 8,78, IC 95% 2,24-34,38; p = 0,002) y la colonoscopia incompleta (OR 4,73, IC 95% 1,15-19,34; p = 0,03). Conclusiones: la polipectomía endoscópica permite la resección completa del 91,4% de los adenocarcinomas invasivos sobre adenoma en nuestra serie. Los factores asociados a la resección incompleta son el tamaño de la lesión, la morfología no pediculada y la colonoscopia incompleta(AU)

Background and objective: endoscopic polypectomy may allow curative resection of invasive adenocarcinoma on colorectal adenoma. Our goal is was to determine the factors associated with complete endoscopic resection of invasive adenocarcinoma. Methods: retrospective observational study. We included 151 patients with invasive adenocarcinoma on adenomas endoscopically resected between 1999 and 2009. We determined those variables independently related to incomplete resection by a logistic regression. Relation was expressed as Odds Ratio (OR) and its 95% confidence interval (95% CI). Results: patients were predominantly male (66.2%) and their mean age was 68.03 ± 10.65 years. Colonoscopy was incomplete in 84% of the patients and 60.3% had synchronous adenomas. Invasive adenocarcinoma was mainly located in distal colon (90.7%) and morphology was pedunculated in 75.5%. The endoscopic average size was 22.61 ± 10.86 mm. Submucosal injection was required in 32.5%. Finally, the resection was in one piece in 73.5% and incomplete in 8.6% of the adenocarcinomas. Factors independently associated with incomplete endoscopic resection were size (mm) (OR 1.08, 95% CI 1.03-1.14, p = 0.002), sessile or flat morphology (OR 8.78, 95% CI 2.24-34.38, p = 0.002) and incomplete colonoscopy (OR 4.73, 95% CI 1.15-19.34, p = 0.03). Conclusions: endoscopic polypectomy allows complete resection of 91.4% of invasive adenocarcinomas on colorrectal adenoma in our series. Factors associated with incomplete resection were the size of the lesion, sessile or flat morphology and incomplete colonoscopy(AU)