The Addition of Preoperative Radiation Is Insufficient for Lateral Pelvic Control in a Subgroup of Patients With Low Locally Advanced Rectal Cancer: A Post Hoc Study of a Randomized Controlled Trial
| Autor: | Zenghong Huang, Yumo Xie, Liangliang Bai, Puning Wang, Du Cai, Huichuan Yu, Tang Guannan, Meijin Huang, Xiaolin Wang, Yanxin Luo, Jianping Wang, Jinxin Lin, Qi Zou, Zhuokai Zhuang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Adult
Male Post hoc Colorectal cancer medicine.medical_treatment Population Locally advanced Adenocarcinoma law.invention Cohort Studies Randomized controlled trial law medicine Humans education Aged Neoplasm Staging Pelvic Neoplasms education.field_of_study Proctectomy Rectal Neoplasms business.industry Incidence Gastroenterology Chemoradiotherapy General Medicine Middle Aged medicine.disease Magnetic Resonance Imaging Total mesorectal excision Neoadjuvant Therapy Radiation therapy Lymph Node Excision Female Lymph Tomography X-Ray Computed Nuclear medicine business |
| Zdroj: | Diseases of the Colon & Rectum. 64:1321-1330 |
| ISSN: | 0012-3706 |
| DOI: | 10.1097/dcr.0000000000001935 |
| Popis: | Background The local recurrence of rectal cancer has been improved by total mesorectal excision following neoadjuvant chemoradiotherapy. However, in patients with low locally advanced rectal cancer, lateral pelvic recurrence remains to be addressed. Objective This study aimed to determine the efficiency of neoadjuvant radiotherapy in addressing lateral pelvic recurrence and which subgroup of patients might be optimal to receive lateral lymph node dissection. Design The MRI/CT images were reassessed for lateral lymph node status. The lateral lymph nodes with short axis ≥5 mm and ≥4 mm were considered positive in pretreatment and restaging MRI/CT. Setting This was a post hoc analysis of a prospective randomized controlled trial (FOWARC, NCT01211210). Patients A total of 495 patients with stage II or III rectal adenocarcinoma were included in the original trial. According to the excluding criteria, the finally included population consists of 253 patients; of these, 195 patients received neoadjuvant chemoradiotherapy and 94 received chemotherapy alone. Main outcomes and measures The primary outcome was the 5-year lateral pelvic recurrence rate. Results Compared with patients receiving chemotherapy alone, patients receiving additional radiotherapy had a marginal significance of lower lateral pelvic recurrence rate (6.6% vs 13.0%; p = 0.051). In the subset with pretreatment positive lateral lymph nodes, patients had a lateral pelvic recurrence rate of 22.6% and 45.1% after neoadjuvant chemoradiotherapy and chemotherapy alone. Of note, 34.9% of the pretreatment positive lateral lymph nodes were persistent after neoadjuvant chemoradiotherapy, culminating in a lateral pelvic recurrence rate of 63.3%. Limitations This is a post hoc analysis, and only the patients from the leading center were included, which limited the sample size. In addition, the lateral lymph node dissection was not performed in this cohort. Conclusions The addition of radiotherapy in neoadjuvant regimens could not address lateral pelvic recurrence adequately. Some subgroups of patients might need additional dissection. See Video Abstract at http://links.lww.com/DCR/B613. La inclusion de la radioterapia preoperatoria es insuficiiente en el control plvico lateral en un subgrupo de pacientes con cncer de recto inferior localmente avanzado un estudio posthoc controlado y randomizado ANTECEDENTES:La recurrencia local del cancer de recto ha disminuido al efectuar una excision mesorrectal total seguida de quimioradioterapia neoadyuvante. No obstante, en pacientes con cancer de tercio inferior de recto avanzado localmente, aun esta por controlarse la recurrencia pelvicaOBJETIVOS:Determinar la eficacia de la radioterapia neoadyuvante en el control de la recurrencia pelvica lateral y en que subgrupo de pacientes seria conveniente efecutar una excision lateral de las cadenas ganglionares.DISENO:Se reevaluaron las imagenes tomograficas y de resonancia magnetica del status de las cadenas ganglionares linfaticas laterales. Los ganglios linfaticos laterales con un eje-corto > 5 mm y ≥ 4 mm se consideraron como positivos previo al tratamiento y reestadificados con RM y TAC respectivamente.ESCENARIO:Es un analisis post hoc de un studio prospectivo randomizado controlado (FOWARC, NCT01211210).PACIENTESSe incluyeron un total de 495 pacientes en estdio II o III con adenomcarcinoma rectal en el estudio original. De acuerdo a los criterios de exclusion, la poblacion final incluida consistio en 253 pacientes; de estos, 195 recibieron quimioradioterapia neoadyuvante y 94 quimioterapia sola.EVALUACION DE LOS RESULTADOS PRINCIPALES:El parametro mas importante fue la tasa de recurrencia pelvica lateral a cinco anos.RESULTADOS:En comparacion con los pacientes que recibieron quimioterapia sola, aquellos que ademas fueron sometidos a radioterapia adicional presentaron un margen significativo de menor tasa de recurrencia pelvica lateral (6.6% vs. 13.0%; p=0.051). En el grupo de pacientes con ganglios linfaticos laterales positivos, los enfermos presentaron una tasa de recurrencia pelvica lateral de 22.6% y 45.1% despues de quimioradiaterapia neoadyuvante en comparacion con quimioterapia sola respectivamente. Cabe mencionar que el 34.9% de los pacientes con ganglios linfaticos laterales positivos antes del tratamiento persistieron despues de la quimioradioterapia neoadyuvante, reportandose finalmente una recurrencia pelvica lateral de un 63.3%.LIMITACIONES:Se trata de un analisis posthoc y solo los pacientes del hospital fueron incluidos, lo que limita el tamano de la muestra. Ademas, no se efectuo la diseccion de los ganglios linfaticos laterales en este grupo.CONCLUSIONES:La radioterapia en los esquemas de neoadyuvancia no logran controlar la recurrencia pelvica lateral en forma adecuada. Algunos subgrupos de pacientes podria requerir de diseccion adicional. Consulte Video Resumen en http://links.lww.com/DCR/B613. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|