Resecabilidad de las metástasis hepáticas según la lateralidad del tumor colorrectal primario y la temporalidad de presentación. Serie de casos en dos instituciones de alta complejidad de la ciudad de Medellín / Resectability of liver metastasis according to the laterality of the primary colorectal tumor and the temporality of presentation. Case series in two high-complex institutions in the city of Medellín

Introducción. La neoplasia colorrectal es una patología oncológica muy frecuente a nivel mundial y una de las causas más comunes de mortalidad por cáncer. La epidemiologia, diagnóstico y tratamiento han sido ampliamente estudiadas, mientras que los datos sobre la enfermedad metastásica siguen siendo escasos. El hígado es el órgano más comúnmente afectado y algunos estudios sugieren diferencias en sobrevida y resecabilidad según la localización del tumor primario. El objetivo de este estudio fue establecer el comportamiento y resecabilidad de neoplasias avanzadas colorrectales en dos hospitales de la ciudad de Medellín, Colombia. Métodos. Estudio analítico retrospectivo para identificar los patrones de las metástasis hepáticas y sus características en función de las diferencias clínicas, histológicas y endoscópicas del tumor colorrectal primario entre 2015 y 2020. Resultados. Se recolectaron 54 pacientes con neoplasia colorrectal y metástasis hepáticas, 21 (39 %) derechas y 33 (61 %) izquierdas. El número de metástasis promedio fue de 3,1 en tumores del lado derecho y de 2,4 del izquierdo y el tamaño promedio de cada lesión fue de 4,9 y 4,2 cm, respectivamente. La tasa de resecabilidad fue del 42 % en los tumores derechos y del 82 % en los izquierdos. Las lesiones metacrónicas presentaron una tasa de resecabilidad del 90 % y las sincrónicas del 61 %. Conclusión. En este estudio, las lesiones originadas en neoplasias primarias del colon izquierdo y las lesiones metacrónicas fueron factores pronósticos favorables para la resecabilidad, un factor que impacta en la sobrevida y el tiempo libre de enfermedad de estos pacientes.

Introduction. Colorectal tumor is the most frequent pathology worldwide and one of the most common causes of mortality attributed to cancer. Epidemiology, diagnosis and treatment have been extensively studied, while information on metastatic disease remains scarce, despite being the main cause of death. Some studies suggest differences in terms of survival and resectability according to the anatomical location of the primary tumor. The aim is to establish the behavior and resectability of advanced cancers in two high-complex hospitals in the city of Medellín, Colombia. Methods. Cross-sectional observational study from secondary sources of information based on a retrospective cohort, using available data from adult patients with colorectal cancer and liver metastases between 2015 and 2020. Results. Fifty-four patients with colorectal neoplasms and liver metastases were collected, of which 21 (39%) were on the right side. The average number of liver metastases was 3.1 on the right side and 2.4 on the left, and the average size of each metastatic lesion was 4.9 cm and 4.2 cm, respectively. The resectability rate was 42% in the right tumors and 82% in the left ones. Metachronous lesions had a resectability rate of 90% and synchronous ones 61%. Conclusion. The complete resectability of liver metastatic lesions is the only therapeutic alternative with impact, in terms of survival and disease-free time in these patients. The favorable prognostic factors for the resectability of these lesions in our study were those originating from left primary tumors and metachronous lesions, where less liver tumor involvement was evidenced

A retrospective study of endoscopic submucosal dissection for colorectal tumors / 中华消化内镜杂志

Objective To investigate the clinical efficacy of endoscopic submucosal dissection (ESD)for the treatment of colorectal tumors, and to analyze risk factors affecting operation time. Methods A retrospective study was conducted using data of 74 cases with colorectal tumor,who underwent ESD in Department of Gastroenterology of Wuhan University Renmin Hospital from January 2014 to September 2015. The clinical efficacy of ESD, occurrence of complications and follow-up results were summarized,and the risk factors of operation time were analyzed. Results The rate of ESD en bloc resection and histological complete resection was 97.30%(72/74)and 89.19%(66/74), respectively. Among the 8 cases of histological non-curative resection, 2 cases received appended surgical procedures because of deep invasion of tumor(SM2),6 cases were given close follow-up according to the pathological result of adenomas. Among the 74 cases, no acute hemorrhage or pneumoperitoneum occurred. Four cases (5.41%, 4/74)had postoperative delayed bleeding, and were successfully treated by endoscopic hemostasis. Four cases(5.41%, 4/74)had intraoperative perforation, and were successfully treated by endoscope. No recurrence or abnormal lesions occurred during the follow-up of 15-35 months. Multivariate linear regression analysis showed that tumor size was a main risk factor for ESD operation time(P=0.000). Conclusion ESD, as a minimally invasive treatment, is safe and effective for the treatment of colorectal tumors,and the tumor size is a main risk factor of ESD operation time.

Simultaneous Laparoscopic-Assisted Colorectal Resection and Nephrectomy

Simultaneous laparoscopic surgery for colorectal cancer and coexisting abdominal disease is shown to be feasible. However, simultaneous laparoscopic colorectal resection and nephrectomy is rarely documented, and its feasibility is unknown. We report two cases of simultaneous colorectal resection for colorectal cancer and nephrectomy. In the first case, a 71-year-old female underwent laparoscopic right hemicolectomy for an ascending colon cancer and left nephrectomy for a left non-functioning kidney. The second patient was a 77-year-old male with descending colon cancer and left renal cell carcinoma who underwent laparoscopic left hemicolectomy and left nephrectomy. The body mass indexes were 21.73 and 26.78 kg/m², respectively, and operation time was 275 and 395 minutes. Blood loss was 300 and 250 cc, and the postoperative hospital stay was 8 and 10 days. In both cases, there was no postoperative morbidity or mortality. Simultaneous laparoscopic resection for colorectal cancer and nephrectomy is a feasible and safe procedure.

Metástasis hepática de origen no colorrectal ni neuroendocrino: tratamiento quirúrgico / Surgical excision of non colorectal liver metastases

Background: The benefits of hepatic resections for colorectal liver metastases are well known. This is not the case for excisions in the treatment of non-colorectal, non neuroendocrine liver metastases. Aim: To assess the results of liver resection in the treatment of patients with non-colorectal, non neuroendocrine liver metastases. Material and Methods: Electronic database analysis of patients with noncolorectal non-endocrine liver metastases undergoing to hepatectomy between 2000-2009. Results: Seventeen patients aged 22 to 78 years, nine women, were operated. The most common primary tumors were stomach, liver, adrenal glands and uterus. In two cases, a synchronic primary tumor and metßstasis excision was performed. Anatomic seg-mentectomy was performed in 10 cases (58.8 percent) and a mayor surgical resection in 7 patients (41.2 percent). In 15 cases (88.2 percent) the tumor margins were negative. Three patients presented postoperative complications and three patients had hepatic tumor recurrence. No patient died in the peri-operative period. One, two and three years survival were 85, 51 and 51 percent respectively, after a follow-up ranging from 9 to 56 months. Conclusions: The surgical treatment of patients with non-colorectal non-endocrine liver metastases is safe and beneficial in selected patients, with a low rate of complications and good survival rates.

Introducción: Existe un claro beneficio en el tratamiento quirúrgico de las metástasis hepáticas de origen colorrectal y neuroendocrinas; sin embargo, todavía no está bien definida la efectividad de la resección quirúrgica en tumores de origen diferente a los anteriores. El objetivo del presente estudio es dar a conocer los resultados del tratamiento quirúrgico en este grupo de pacientes. Pacientes y Método: Análisis de la base de datos electrónica de los pacientes con metástasis hepáticas de origen no colorrectal ni neuroendocri-na que fueron sometidos a resección hepática en nuestro centro entre los años 2000-2009. Resultados: La serie estuvo constituida por 17 pacientes, nueve mujeres, mediana de edad de 51 años (rango, 22-78). Los principales sitios de origen del tumor primario fueron estómago, hígado, glándulas suprarrenales y útero. En dos casos se realizó cirugía sincrónica del primario y las metástasis; la técnica utilizada fue segmentectomía anatómica en 10 pacientes (58,8 por ciento) y resección anatómica mayor los siete restantes (41,2 por ciento). En 15 pacientes (88,2 por ciento) se logró borde quirúrgico libre de tumor, tres pacientes presentaron complicaciones postoperatorias y en tres hubo recidiva de la lesión hepática. No hubo mortalidad operatoria. Tras un seguimiento de 21 meses (rango, 9-56) la supervivencia al año, a los dos y a los tres años fue de 85 por ciento, 51 por ciento y 51 por ciento respectivamente. Discusión: El tratamiento quirúrgico de los pacientes con metástasis hepáticas de origen no colorrectal ni neuroendocrino es seguro y parece beneficioso en pacientes seleccionados, con baja tasa de complicaciones y con supervivencia favorable.

Immunohistochemical Study of p53 Protein Expression in Colorectal Tumors

The aims of this study were to assess the role of p53 overexpression in colorectal tumorigenesis and the association with clinicopathological features. The immunohistochemical results were semiquantitatively assessed. Expression of aberrant p53, tumor-suppressor gene product, was studied immunohistochemically using a monoclonal antibody in 11 nonneoplastic polyps, 19 tubular adenomas, 9 villous adenomas, and 48 colorectal carcinomas. Five out of 11 nonneoplastic polyps, 14 out of 19 tubular adenomas and one out of 9 villous adenomas expressed p53 protein. Seven out of 24 colorectal carcinomas without lymph node metastasis and 14 out of 24 colorectal carcinomas with lymph node metastsis expressed p53 protein. The case of more than 75% positivity of p53 in colorectal carcinoma with lymph node metastasis was seven out of 24, but that in lymph node negative group was two out of 24. In the colorectal carcinoma with lymph node metastasis group; metastatic intranodal neoplastic cells were expressed positively for p53 in 10 out of 14 cases and zero out of 10 cases in group of positive and negative expression of primary lesions, respectively. p53 protein expression was not significantly correlated with variable clinicopathologic features such as age, sex, tumor location, tumor size, differentiation and Dukes' stage. It is suggested that p53 protein overexpression could be a early event in pathogenesis of colon cancer but is not involved in progression of villous adenoma to adenocarcinoma. p53 overexpression seems to be involved in metastatic ability of colorectal carcinomas.

RAT P53GENE MUTATIONS IN THE COLORECTAL TUMORS INDUCED BY N-METHYL-N-NITROSOUREA / 解剖学报

Objective We have examined tumor suppressor gene p53 from N- methyl - N- nitrosourea (MNU ) induced the col - orectal tumors in rats. Methods PCR, SSCP and DNA sequence analysis. Results In colorectal tumors induced by MNU, the mobil- ity shifts of p53 gene mutation were observed, p53 gene mutation was a deletion at third position C of codon 244 in exon7. Conclu- sion The present study suggested that MNU induces rat p53 mutations in the colorectal tumors.