Prediction of Clinical Response to Dupilumab for CRSwNP Based on the Amsterdam Classification of Completeness of Endoscopic Sinus Surgery (ACCESS) Score.

Purpose: Although the effectiveness of molecular antibodies has been established, evidence is still lacking on objective predictors of response. The aim of this study was to assess whether the extent of previous endoscopic sinus surgeries, assessed by means of the Amsterdam Classification of Completeness of Endoscopic Sinus Surgery (ACCESS) score, may influence clinical outcomes in refractory CRSwNP patients treated with dupilumab.

Materials and methods: A consecutive sample of patients treated with dupilumab for previously operated recalcitrant CRSwNP were enrolled in the study. Every patient was required to undergo a CT scan at baseline (T0), at 3 (T1), and 12 (T2) months after treatment start. ACCESS score was calculated at baseline, whilst at every timepoint patients underwent assessment of Nasal-Polyp-Score (NPS), Lund-Kennedy-Score (LKS), and had to fill in the 22-item Sinonasal-Outcome-Test (SNOT-22) and Visual-Analog-Scales (VAS) for sinonasal symptoms. Favorable outcome was considered based on EUFOREA guidelines, namely improving at least 3 of the followings: (i) NPS; (ii) SNOT-22; (iii) VAS-olfaction; and (iv) need for systemic corticosteroids.

Results: Overall favorable outcome was achieved in 69.1% (n = 38/55) of cases at T1, while in 89.1% (n = 49/55) at T2. There were no differences in baseline characteristics between responders and non-responders at both timepoints. At T1, out of all the included variables, no statistically significant predictor of favorable outcome was observed. Conversely, at T2, ACCESS score was the only confirmed independent predictive factor of response to dupilumab treatment (OR = 0.81 [95% CI = 0.67-0.92], P = .010).

Conclusions: Our findings suggest that the extent of previous endoscopic sinus surgeries may have a role in influencing clinical outcomes in patients with refractory CRSwNP undergoing treatment with dupilumab.