Abstract
196
Background: Metastatic thyroid cancer portends a poor prognosis, especially in patients over the age of 55 or in more aggressive histologies, such as anaplastic. Palliative care (PC), which focuses on improving the quality of life in patients with severe disease, may be beneficial to these patients. To our knowledge, there has yet to be a study describing the demographic and usage factors associated with PC in metastatic thyroid cancer. Methods: We conducted a retrospective analysis of the National Cancer Database (NCDB) from 2004-2017 for subjects with metastatic thyroid cancer (n = 5,229) of all histologies. Analysis was completed between patients who utilized PC (n = 826) and patients who did not use PC (n = 4,403). The NCDB defines palliative care as care provided to alleviate or palliate symptoms, including radiation therapy, surgery, pain management, and/or systemic therapy. PC usage and survival were compared between cancer subtypes. Demographic factors were analyzed using Pearson chi-squared tests and t-tests, while survival was estimated using Kaplan-Meier curves. Results: Of the subjects with metastatic thyroid cancer, 50.6% had papillary, 25.2% had anaplastic, 15.9% had follicular, and 8.3% had medullary thyroid cancer. Anaplastic, medullary, follicular, and papillary metastatic cancers had median survivals of 2.4, 19.9, 49.5, and 55.3 months, respectively (p < 0.001). PC usage increased between 2004 (3.4%) and 2017 (11.4%) across all subtypes. The mean age at diagnosis of PC patients was 69.2 years old compared to 66.9 years old for non-PC patients (p < 0.001). Anaplastic thyroid cancer made up the greatest proportion of PC usage (42.5%) compared to other histologies (p < 0.001). Subjects of Spanish/Hispanic origin received PC at lower proportions (p < 0.001). In addition, Asian patients made up a smaller fraction of the PC cohort (4.2%) compared to the non-PC cohort (6.7%) (p = 0.028). Patients with private insurance made up a smaller proportion of PC users (26.5%) compared to non-PC users (35.6%), while subjects with government insurance or no insurance made up a greater proportion of PC usage (p < 0.001). Less PC usage was seen by patients who lived in an area where greater than 17.6% of individuals did not attain a high school degree; these patients made up 25.3% and 19.9% of the non-PC and PC cohorts, respectively (p = 0.006). Patients who received PC tended to live closer to the reporting hospital (p = 0.007). No statistically significant difference was seen between PC and non-PC cohorts for income and facility type. Conclusions: In this study, we highlighted several disparities in PC usage across common types of thyroid cancer. We also compared usage between categories and noted a greater proportion of PC usage in recent years. Our study is a valuable baseline as PC continues to be integrated in cancer care.