Predominant Endotype of Nasal Polyps in a Sample of Filipinos Following Endoscopic Sinus Surgery for Chronic Rhinosinusitis with Nasal Polyposis

Objective: To determine the prevalence of eosinophilic and non-eosinophilic nasal polyps in Filipino patients with chronic rhinosinusitis with nasal polyposis (CRSwNP) who underwent endoscopic sinus surgery. Methods: Design: Retrospective Chart Review Setting: Tertiary Government Training Hospital Participants: A consecutive sample of adult patients who underwent endoscopic sinus surgery for chronic rhinosinusitis with nasal polyposis at the Rizal Medical Center from 2015-2019. Results: Out of 66 patients who underwent endoscopic sinus surgery during the study period, 36 (54.55%) had an eosinophilic endotype while 30 (45.45%) had a non-eosinophilic endotype. Conclusion: The slight predominance of eosinophilic nasal polyps found in our sample may suggest a contrasting trend compared to our Asian neighbors, who have a predominantly noneosinophilic endotype – Indonesia (90.47%), Thailand (81.9%), South Korea (66.7%) and China (53.6%). However, this predominance is still lower than the 78-88% eosinophilia reported among Caucasians. Larger series may confirm these preliminary findings.