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Enhanced Clinical Efficacy of Sublingual Immunotherapy for Japanese Cedar Pollinosis in the Second Year of Treatment.

Sublingual immunotherapy (SLIT) is thought to have enhanced efficacy in the second year of treatment. We studied treatment efficacy in both the first and the second years of treatment (2015 and 2016, respectively) in patients who began SLIT in 2014.
Methods: We compared 132 patients who underwent SLIT (age, 41.8 ± 17.5 years; male-to-female ratio, 75: 57) and a control group of 56 patients who underwent primary pharmacotherapy (age, 44.9 ± 13.5 years; male-to-female ratio, 25: 31). The study was performed during the peak pollen seasons of 2015 and 2016. Pollen dispersal was similar in 2015 and 2016 (2,509 grains/cm2 and 3,505 grains/cm2, respectively). The clinical efficacy of SLIT was evaluated by assessing nasal and eye symptoms and total symptoms with symptom scores and combined symptom-medication scores, visual analog scale scores, and quality of life (QOL) scores according to the Japanese rhino-conjunctivitis QOL questionnaire (JRQLQ No. 1). QOL was also evaluated with JRQLQ No. 1. The first endpoint was enhanced efficacy of SLIT in the second year compared with that in the first year.
Results: With respect to nasal and eye symptoms, the assessments in the primary pharmacotherapy group were unchanged in the second year; however, most of these assessments in the SLIT group demonstrated significantly enhanced efficacy of SLIT in the second year. In QOL of SLIT, only 2 of 17 showed significantly enhanced efficacy of SLIT in the second year.
Conclusion: SLIT shows enhanced efficacy in the second year.