Published online Oct 15, 2019. doi: 10.4251/wjgo.v11.i10.857
Peer-review started: February 27, 2019
First decision: April 11, 2019
Revised: May 1, 2019
Accepted: September 12, 2019
Article in press: September 12, 2019
Published online: October 15, 2019
Processing time: 231 Days and 15 Hours
Neoadjuvant chemoradiotherapy (nCRT) followed by resection and postoperative multi-agent chemotherapy (maChT) is the standard of care for locally advanced rectal cancer. Using this approach, maChT administration can be delayed for several months, leading to concern for distant metastases. To counteract this, a novel treatment approach known as total neoadjuvant therapy (TNT) has gained popularity, in which patients receive both maChT and nCRT prior to resection. We utilized the National Cancer Database to examine temporal trends in TNT usage, and any potential effect on survival.
To study the temporal trends in the usage of TNT and evaluate its efficacy compared to neoadjuvant chemoradiation.
We queried the National Cancer Database for patients with locally advanced rectal cancer, Stage II-III, from 2004-2015 treated with nCRT or TNT. TNT was defined as maChT initiated ≥ 90 d prior to nCRT initiation. Overall survival was calculated from the date of diagnosis to the date of last contact or death using Kaplan-Meier curves to present the cumulative probability of survival, with log-rank statistics to assess significance. Multivariable cox regression was used to identify predictors of survival and propensity score analysis accounted for bias.
We identified 9066 eligible patients, with 8812 and 254 patients receiving neoadjuvant chemoradiation followed by maChT and TNT, respectively. Nodal involvement, stage III disease, and treatment in recent years were predictive of TNT use. There was greater use of TNT with more advanced stage, specifically > 1 node involved (odds ratio [OR] = 2.88, 95% confidence interval [CI]: 2.11-3.93, P < 0.01) and stage III disease (OR = 2.88, 95%CI: 2.11-3.93, P < 0.01). From 2010 to 2012 the use of TNT increased (OR = 2.41, 95%CI: 1.27-4.56, P < 0.01) with a greater increase from 2013 to 2015 (OR = 6.62, 95%CI: 3.57-12.25, P < 0.01). Both the TNT and neoadjuvant chemoradiation arms had a similar 5-year survival at 76% and 78% respectively. Multivariable analysis with propensity score demonstrated that increased age, high comorbidity score, higher grade, African American race, and female gender had worse overall survival.
Our data demonstrates a rising trend in TNT use, particularly in patients with worse disease. Patients treated with TNT and nCRT had similar survival. Randomized trials evaluating TNT are underway.
Core tip: Total neoadjuvant treatment (TNT) has been gaining favor as the treatment of choice for rectal carcinoma. It has been linked to better sphincter preservation and overall improved quality of life. Our study aim was to compare TNT with traditional chemotherapy and radiation over the last 10 years and evaluate the differences in outcomes. Our study confirms a rising trend in the of use of TNT especially in patients diagnosed with locally advanced rectal cancer. Patients treated with TNT had higher burden of disease but had similar survival outcomes as those treated with traditional chemotherapy and radiation.