Effect of time to initiation of postoperative radiation therapy on survival in surgically managed head and neck cancer

Adjuvant radiotherapy after curative surgery for oral cavity squamous cell carcinoma and treatment effect of timing and duration on outcome-A Taiwan Cancer Registry national database analysis

Conduct an accurate risk assessment of resected oral cavity squamous cell carcinoma (OSCC) patients by accessing a nationwide systemic investigation is pivotal to improve treatment outcomes. In this article, we tried to determine the impact of different prognostic factors for OSCC patients who received adjuvant radiotherapy (RT) after curative surgery, using Taiwan's national cancer registry database (TCR). A nationwide, large population‐based study was conducted using TCR with patients identified from 2007 to 2015. The study variables included age, gender, cancer subsites, stage, histology grade, margin and extra‐nodal extension (ENE) status, treatment type, surgery to RT interval (ORI), total RT treatment time (RTT), and RT dose. Univariate and multivariate analysis were performed to identify predictors of the variables associated with overall survival (OS), cause‐specific survival (CSS), local‐regional relapse‐free survival (LRFS), and distant metastasis‐free survival (DMFS). 8986 OSCC patients treated with surgery and adjuvant RT were analyzed. In multivariate analysis, worse outcomes were associated with males, older age, subsite in the oral tongue, advanced stage, higher histologic grade, involved margin, and positive ENE. ORI only showed an adverse trend in LRFS, when exceeding 7 weeks (P = .06). RTT >8 weeks was a significant poor predictor in OS, CSS and LRFS (P < .001). Extreme RT dose (>70 Gy or ≤50 Gy) also demonstrated an adverse impact on the outcomes. Prolonged RT treatment time and extreme RT doses were identified as significantly poor prognostic predictors in OSCC patients who received adjuvant RT after curative surgery.

Quantitative survival impact of composite treatment delays in head and neck cancer

BACKGROUND

Multidisciplinary management of head and neck cancer (HNC) must reconcile increasingly sophisticated subspecialty care with timeliness of care. Prior studies examined the individual effects of delays in diagnosis-to-treatment interval, postoperative interval, and radiation interval but did not consider them collectively. The objective of the current study was to investigate the combined impact of these interwoven intervals on patients with HNC.

METHODS

Patients with HNC who underwent curative-intent surgery with radiation were identified in the National Cancer Database between 2004 and 2013. Multivariable models were constructed using restricted cubic splines to determine nonlinear relations with overall survival.

RESULTS

Overall, 15,064 patients were evaluated. After adjustment for covariates, only prolonged postoperative interval (P < .001) and radiation interval (P < .001) independently predicted for worse outcomes, whereas the association of diagnosis-to-treatment interval with survival disappeared. By using multivariable restricted cubic spline functions, increasing postoperative interval did not affect mortality until 40 days after surgery, and each day of delay beyond this increased the risk of mortality until 70 days after surgery (hazard ratio, 1.14; 95% confidence interval, 1.01-1.28; P = .029). For radiation interval, mortality escalated continuously with each additional day of delay, plateauing at 55 days (hazard ratio, 1.25; 95% confidence interval, 1.11-1.41; P < .001). Delays beyond these change points were not associated with further survival decrements.

CONCLUSIONS

Increasing delays in postoperative and radiation intervals are associated independently with an escalating risk of mortality that plateaus beyond certain thresholds. Delays in initiating therapy, conversely, are eclipsed in importance when appraised in conjunction with the entire treatment course. Such findings may redirect focus to streamlining those intervals that are most sensitive to delays when considering survival burden. Cancer 2018. © 2018 American Cancer Society.

Reducing the Time from Surgery to Adjuvant Radiation Therapy: An Institutional Quality Improvement Project

Objective The National Comprehensive Cancer Network guidelines recommend an interval between surgery and adjuvant radiation therapy of less than 6 weeks, but only 44% of patients meet this metric nationally. We sought to identify key components of an improvement process focused on starting adjuvant radiation therapy within 6 weeks of surgery. Methods This project used an A3 model to improve a defined process measure. We studied a consecutive sample of 56 patients with oral cavity carcinoma who were treated at our institution with upfront surgical resection followed by adjuvant radiation therapy. Twelve proposed interventions tested during the study period focused on 3 key drivers of delays: delayed dental evaluation and teeth extraction, delayed radiation oncology consults, and inadequate patient engagement. The primary outcome measure was the number of days from surgery to the start of radiation therapy. Results Prior to the intervention, 62% of patients received adjuvant radiation within 6 weeks of surgery. Following the intervention, 73% of patients achieved this metric. The percentage of patients with avoidable delays decreased from 24% to 9%. The percentage of patients with unavoidable delays was relatively constant before and after the intervention (15% and 18%, respectively). Discussion Defining disease-specific metrics is critical to improving care in our head and neck cancer patient population. We demonstrate several key components to develop and improve self-defined metrics. Implications for Practice As we transition to a system of value-based care, structured quality improvement projects can have a measurable impact on cancer patient process measures.

The impact of adjuvant chemoradiotherapy timing on survival of head and neck cancers

BACKGROUND

Delays in postoperative head and neck (HN) radiotherapy have been associated with decreased overall survival; however, the impact of delays in postoperative HN chemoradiotherapy remains undefined.

METHODS

All patients with nonmetastatic HN cancer (oral cavity, oropharynx, larynx, hypopharynx) who underwent curative intent surgery and received adjuvant chemoradiotherapy were identified from the National Cancer Database (2005-2012). Overall treatment time (OTT) was defined as the time from surgery to the end of radiation therapy. Statistical methods included Cox proportional hazards modeling, which adjusted for clinicopathologic, demographic, and socioeconomic factors. Recursive partitioning analysis (RPA) identified the optimal threshold of OTT via conditional inference trees to estimate the greatest differences in overall survival (OS) on the basis of randomly selected training and validation sets.

RESULTS

A total of 16,733 patients were included, with a median follow-up of 37 months. Median OS for OTT in a predefined threshold of ≤ 13 weeks was 10.1 years (95% confidence interval [CI], 9.8 years; not reached) compared with 8.7 years (95% CI, 8.2-9.2 years) in > 13 weeks. On multivariate analysis, OTT of > 13 weeks versus ≤ 13 weeks independently increased mortality risk (hazard ratio, 1.10; 95% CI, 1.04-1.17; P = < 0.001). RPA identified an optimal OTT threshold of 97 days (interquartile range: 96-98 days). The OTT threshold of 97 days was confirmed in a full Cox regression model estimating the risk of death according to overall treatment time as a continuous variable.

CONCLUSION

In this large hospital-based national data, an OTT of greater than approximately 14 weeks most consistently increased the risk of death.

LEVEL OF EVIDENCE

4. Laryngoscope, 128:2326-2332, 2018.