The impact of neoadjuvant chemotherapy on low anterior resection syndrome after rectal cancer resection: A 6 Months longitudinal follow-up

Risk factors for severe low anterior resection syndrome in patients with rectal cancer undergoing sphincter‑preserving resection: A systematic review and meta‑analysis

The present study aimed to evaluate the incidence and risk factors of severe low anterior resection syndrome (LARS) in patients with rectal cancer undergoing sphincter-preserving resection, and to provide the clinical basis and reference for the treatment of rectal cancer and the prevention of LARS. Studies on the incidence and risk factors for severe LARS in patients with rectal cancer undergoing sphincter-preserving resection were searched using PubMed, Embase, Cochrane Library, Scopus and Web of Science, according to the inclusion and exclusion criteria. After evaluating the study quality and extracting relevant data, RevMan 5.2 and STATA software were used to conduct a meta-analysis. A total of 12 articles were considered eligible for the present meta-analysis. Within these articles, there were 3,877 cases of sphincter-preserving resection for rectal cancer and 1,589 cases of severe LARS; the incidence of severe LARS was 40.99%. The results of the meta-analysis revealed that sex [female; odds ratio (OR), 6.54; 95% CI, 3.63-11.76; Z, 6.27; P<0.00001], radiotherapy and chemotherapy (OR, 3.45; 95% CI, 2.29-5.21; Z, 5.91; P<0.00001), total mesorectal excision (TME; OR, 4.39; 95% CI, 3.32-5.79; Z, 10.41; P<0.00001), and distance between tumor and anal margin (OR, 2.74; 95% CI, 0.86-8.72; Z, 1.70; P<0.00001) may be the risk factors for severe LARS.

Bowel Functional Outcomes After Long-Course or Short-Course Radiation for Advanced Rectal Cancers: A Propensity-Matched Analysis

BACKGROUND

Despite short-course radiation and chemotherapy gaining popularity because of similar or better oncological outcomes, functional outcomes relative to long-course radiation have not been evaluated.

OBJECTIVE

To compare bowel function outcomes after long-course or short-course radiation and delayed operation for advanced rectal cancers.

DESIGN

Propensity-matched analysis.

SETTINGS

This study was conducted at a single tertiary cancer center. Patients were operated on between 2014 and 2020.

PATIENTS

The study included patients with locally advanced, nonmetastatic, mid, and low rectal cancers who underwent low anterior resection with stapled anastomosis and diverting ostomy. Extended or beyond total mesorectal excisions and lateral node dissections were excluded.

INTERVENTIONS

Long-course radiation delivered as a radiation dose of 50 Gy in 25 fractions or short-course radiation (5 Gy in 5 fractions) and delayed surgery after 4 to 6 weeks with or without chemotherapy.

MAIN OUTCOME MEASURES

One-time assessment of low anterior resections syndrome and Wexner incontinence scores at least 6 months after stoma reversal.

RESULTS

After matching 124 patients in the 1:2 ratio between short- and long-course radiations, 93 patients were included for analysis. Any low anterior resection syndrome was found in 90.3% of short-course patients compared to 54.8% after long-course radiation (p < 0.001). Major incontinence was detected in 6.5% after short-course radiation as opposed to 8.1% of patients after long-course radiation (p = 0.781). On multivariate logistic regression, short-course radiation predicted the development of any low anterior resection syndrome with an OR of 4.4.

LIMITATIONS

Selection and misclassification biases from retrospective recruitment.

CONCLUSIONS

For patients with locally advanced, nonmetastatic, mid, and low rectal cancers who underwent preoperative radiation followed by stapled low anterior resection, short-course radiation had higher probability of developing low anterior resection syndrome than long-course radiation. See Video Abstract at http://links.lww.com/DCR/C37.

RESULTADOS DE LA FUNCIN INTESTINAL DESPUS DE LA RADIACIN DE CICLO LARGO O CORTO EN CNCER DE RECTO AVANZADO UN ANLISIS EMPAREJADO DE PROPENSIN

ANTECEDENTES:A pesar de que la radiación de corta duración y la quimioterapia están ganando popularidad debido a resultados oncológicos similares o mejores, los resultados funcionales en relación con la radiación de larga duración no han sido evaluado.OBJETIVO:Comparar resultados de la función intestinal después de la radiación de ciclo largo o corto y cirugía diferida para los en cáncer de recto avanzado.DISEÑO:Análisis emparejado de propensión.ENTORNO CLINICO:Centro único de cáncer terciario. Pacientes operados entre 2014 y 2020.PACIENTES:Cánceres de recto medio y bajo localmente avanzados, no metastásicos, que se sometieron a resección anterior baja con anastomosis grapada y ostomía de derivación. Se excluyeron las escisiones total de mesorecto extendidas o más allá del plano y las disecciones de los ganglios laterales.INTERVENCIONES:Radiación de ciclo largo administrada como 50 Gy en 25 fracciones o radiación de ciclo corto (5 Gy en 5 fracciones) y cirugía diferida después de 4 a 6 semanas con o sin quimioterapia.PRINCIPALES MEDIDAS DE RESULTADO:Evaluación única del síndrome de reseccion anterior baja y escala de Wexner de incontinencia al menos seis meses después de la restitución del tránsito intestinal.RESULTADOS:Después de emparejar 124 pacientes en la proporción 1:2 entre radiación de ciclo corto y largo, se incluyeron 93 pacientes para el análisis. Se encontró cualquier síndrome de resección anterior baja en el 90,3% de los pacientes de ciclo corto en comparación con el 54,8% después de la radiación de ciclo largo (p < 0,001). Se detectó incontinencia grave en el 6,5% después de un tratamiento de corta duración frente al 8,1% de los pacientes que recibieron un tratamiento de radiación de larga duración (p = 0,781). En la regresión logística multivariable, la radiación de corta duración predijo el desarrollo de cualquier síndrome de resección anterior baja con una probabilidad de 4,4.LIMITACIONES:Sesgos de selección y clasificación errónea de reclutamiento retrospectivo.CONCLUSIONES:Para los cánceres de recto medio e inferior localmente avanzados, no metastásicos, que se sometieron a radiación preoperatoria seguida de resección anterior baja con grapas, curso corto tuvo una mayor probabilidad de desarrollar síndrome de resección anterior baja en comparación con radiación de curso largo. Consulte Video Resumen en http://links.lww.com/DCR/C37. (Traducción- Dr. Francisco M. Abarca-Rendon).

The risk factors of low anterior resection syndrome after colorectal cancer surgery: A retrospective study of 566 patients in a single institution in China

PURPOSE

This study aims to identify the independent risk factors in the low anterior resection syndrome (LARS) after surgery for colorectal cancer (CRC).

METHOD

This was a retrospective, single-institution study in the Second Affiliation Hospital of Dalian Medical University, China. Patients underwent sphincter-preserving low anterior resection with total or partial mesorectal resection (with or without protective ileostomy) and completed a self-filled questionnaire over the phone to assess postoperative bowel dysfunction from January 2017 to December 2019. The predictors of LAR were evaluated using univariate and multivariate analyses.

RESULT

The study population was 566 patients, 264 (46.64%), 224 (39.58%), and 78 (13.78%) patients with no, minor, and major LARS, respectively. In the univariate analysis, independent factors such as tumor location and size, anastomotic height, protective ileostomy, post-operation chemoradiotherapy, tumor T stage, lymphatic nodal metastasis classification, surgery duration, and time interval for closure of stoma were significantly associated with LARS points while we found the tumor T stage and lymphatic nodal metastasis classification as the new independent risk factors compared with the last decade studies. In the multivariate analysis, factors such as low and middle tumor location and protective ileostomy, and post operation treatment, nodal metastasis classification were the independent risk factors for major LARS.

CONCLUSION

The new independence risk factors were tumor T stage and lymphatic nodal metastasis status in univariate analysis in our study, with anastomotic height, low and middle tumor location, protective ileostomy, post-operation chemoradiotherapy, nodal metastasis status increasing LARS point in multivariate analysis after surgery for CRC.

Effects of Preoperative Radiotherapy on Long-Term Bowel Function in Patients With Rectal Cancer Treated With Anterior Resection: A Systematic Review and Meta-analysis

Background: Anterior resection is a common surgical approach used in rectal cancer surgery; however, this procedure is known to cause bowel injury and dysfunction. Neoadjuvant therapy is widely used in patients with locally advanced rectal cancer. In this study, we determined the effect of preoperative radiotherapy on long-term bowel function in patients who underwent anterior resection for treatment of rectal cancer. Methods: We performed a comprehensive literature search of the PubMed, Embase, Web of Science, and the Cochrane Library databases. A random-effects model was used in the meta-analysis by the Review Manager software, version 5.3. Results: This systematic review and meta-analysis included 12 studies, which used low anterior resection syndrome score with a total of 2349 patients. Based on them, we concluded that low anterior resection syndrome was significantly more common in the preoperative radiotherapy group (odds ratio 3.59, 95% confidence interval 2.68-4.81, P < .00001) and that major low anterior resection syndrome also occurred significantly more frequently in the preoperative radiotherapy group (odds ratio 3.28, 95% confidence interval 2.05-5.26, P < .00001). Subgroup analyses of long-course radiation, total mesorectal excision, and non-metastatic tumors were performed, and the results met the conclusions of the primary outcomes. Conclusions: Preoperative radiotherapy negatively affects long-term bowel function in patients who undergo anterior resection for rectal cancer.