Alexander Lin1, Erika S Helgeson2, Nathaniel S Treister3, Brian L Schmidt4, Lauren L Patton5, Linda S Elting6, Rajesh V Lalla7, Michael T Brennan8, Thomas P Sollecito9. 1. University of Pennsylvania, 3400 Civic Center Blvd., Philadelphia, PA 19104, USA. Electronic address: alexander.lin2@pennmedicine.upenn.edu. 2. University of Minnesota, 2221 University of Ave., Minneapolis, MN 55455, USA. Electronic address: helge@umn.edu. 3. Harvard School of Dental Medicine, 75 Francis Street, Boston, MA 02115, USA. Electronic address: ntreister@bwh.harvard.edu. 4. New York University School of Dentistry, 421 First Ave., New York, NY 10010, USA. Electronic address: brianl.schmidt@nyu.edu. 5. University of North Carolina, Adams School of Dentistry, 120 Dental Circle, Chapel Hill, NC 27599-7450, USA. Electronic address: Lauren_Patton@unc.edu. 6. MD Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030, USA. Electronic address: lelting@mdanderson.org. 7. University of Connecticut School of Dental Medicine, 263 Farmington Ave., Farmington, CT 06030, USA. Electronic address: lalla@uchc.edu. 8. Atrium Health Carolinas Medical Center, 1000 Blythe Blvd., Charlotte, NC 28203, USA. Electronic address: Mike.Brennan@atriumhealth.org. 9. University of Pennsylvania, 3400 Civic Center Blvd., Philadelphia, PA 19104, USA. Electronic address: thomas.sollecito2@pennmedicine.upenn.edu.
Abstract
OBJECTIVES: Salivary hypofunction and xerostomia, are common side effects of radiotherapy, negatively impacting quality of life. The OraRad study presents results on the longitudinal impact of radiotherapy on salivary flow and patient-reported outcomes. PATIENTS AND METHODS: Prospective, multicenter cohort study of 572 patients receiving curative-intent head and neck radiotherapy (RT). Stimulated salivary flow (SSF) rate and patient-reported outcomes were measured prior to RT and at 6- and 18-months post-RT. Linear mixed effects models examined the relationship between RT dose and change in salivary flow, and change in patient-reported outcomes. RESULTS: 544 patients had baseline salivary flow measurement, with median (IQR) stimulated flow rate of 0.975 (0.648, 1.417) g/min. Average RT dose to parotid glands was associated with change in salivary flow post-RT (p < 0.001). Diminished flow to 37% of pre-RT level was observed at 6 months (median: 0.358, IQR: 0.188 to 0.640 g/min, n = 481) with partial recovery to 59% of pre-RT at 18 months (median: 0.575, IQR: 0.338 to 0.884 g/min, n = 422). Significant improvement in patient-reported swallowing, senses (taste and smell), mouth opening, dry mouth, and sticky saliva (p-values < 0.03) were observed between 6 and 18 months post-RT. Changes in swallowing, mouth opening, dry mouth, and sticky saliva were significantly associated with changes in salivary flow from baseline (p-values < 0.04). CONCLUSION: Salivary flow and patient-reported outcomes decreased as a result of RT, but demonstrated partial recovery during follow-up. Continued efforts are needed to improve post-RT salivary function to support quality of life.
OBJECTIVES: Salivary hypofunction and xerostomia, are common side effects of radiotherapy, negatively impacting quality of life. The OraRad study presents results on the longitudinal impact of radiotherapy on salivary flow and patient-reported outcomes. PATIENTS AND METHODS: Prospective, multicenter cohort study of 572 patients receiving curative-intent head and neck radiotherapy (RT). Stimulated salivary flow (SSF) rate and patient-reported outcomes were measured prior to RT and at 6- and 18-months post-RT. Linear mixed effects models examined the relationship between RT dose and change in salivary flow, and change in patient-reported outcomes. RESULTS: 544 patients had baseline salivary flow measurement, with median (IQR) stimulated flow rate of 0.975 (0.648, 1.417) g/min. Average RT dose to parotid glands was associated with change in salivary flow post-RT (p < 0.001). Diminished flow to 37% of pre-RT level was observed at 6 months (median: 0.358, IQR: 0.188 to 0.640 g/min, n = 481) with partial recovery to 59% of pre-RT at 18 months (median: 0.575, IQR: 0.338 to 0.884 g/min, n = 422). Significant improvement in patient-reported swallowing, senses (taste and smell), mouth opening, dry mouth, and sticky saliva (p-values < 0.03) were observed between 6 and 18 months post-RT. Changes in swallowing, mouth opening, dry mouth, and sticky saliva were significantly associated with changes in salivary flow from baseline (p-values < 0.04). CONCLUSION: Salivary flow and patient-reported outcomes decreased as a result of RT, but demonstrated partial recovery during follow-up. Continued efforts are needed to improve post-RT salivary function to support quality of life.
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