Delayed Postoperative Radiotherapy in Head & Neck Cancers-A Systematic Review and Meta-Analysis

To evaluate the impact of delayed postoperative radiotherapy (PORT) on overall survival (OS) in patients with head and neck cancers (HNC). A systematic review and meta-analysis were conducted by searching MEDLINE, Embase, CENTRAL, Web of Science, and CINAHL databases. Studies assessing the impact of delayed PORT in adult HNC patients were included. A total of 11,171 titles and abstracts were screened, with 52 studies meeting the inclusion criteria. Data were extracted, and a pooled random-effects analysis was performed. The primary outcome was overall survival (OS), comparing patients receiving timely PORT (within 42 days) to those with delays. Of the included studies, 31 were conducted in the United States, with 16 using the National Cancer Database (NCDB). Patients who did not receive PORT within 42 days had a 4% increase in mortality (adjusted Hazard Ratio [aHR]: 1.04 [1.03-1.06]; I = 78%; N = 254,189; 16 studies). Excluding time-overlapping NCDB-based studies, the OS benefit for timely treatment persisted (aHR: 1.10 [1.01-1.20]; I = 39%; N = 52,003; 5 studies). Initiating PORT within 42 days is significantly associated with decreased mortality in HNC patients, reinforcing CoC recommendations. However, more research is needed to understand the relationship between different time cutoffs and outcomes, and to identify factors contributing to PORT delays. Future studies should explore the impact of treatment delays on patient-centered outcomes, such as Quality of Life (QoL). NA Laryngoscope, 2024.