The impact of comorbidity on the diagnosis delay, treatment options and prognosis for advanced oral cancer: A retrospective result of the POROMS database.

This study aimed to reveal the underlying mechanisms linking advanced oral squamous cell carcinoma (OSCC) with its comorbidities. Data extracted from the POROMS database included 448 advanced OSCC patients in stage III or IV (AJCC 8th) with primary tumors between August 2015 and August 2021. Time to diagnosis delay increased from 4.5, 5.3-6.5 months when the Adult Comorbidity Evaluation-27 (ACE-27) worsened from none, mild (RR: 1.155, 1.043-1.279; P = 0.006) to moderate-severe (RR: 1.431, 1.251-1.636; P < 0.001). With the number of comorbidities increased from 0, 1-2 (RR: 1.188, 1.078-1.310; P = 0.001) to 3 (RR: 1.563, 1.296-1.885; P < 0.001), the time to diagnosis delay increased from 4.5, 5.4-7.1 months. As the level and number of comorbidities increased, the likelihood of treatment completion gradually declined, especially in those older than 65 years (P = 0.003). The presence of comorbidity was an independent prognostic factor for disease-free survival (HR: 1.431, 1.022-2.005; P = 0.037). Comorbidities may lead to poorer prognosis by directly causing delays in diagnosis, limiting treatment options, and increasing the risk of death in advanced OSCC patients.