Long-Term Response of Recurrent Respiratory Papillomatosis to Treatment with Lymphoblastoid Interferon Alfa-N1

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Abstract
We earlier reported that patients with recurrent respiratory papillomatosis responded to six months of treatment with lymphoblastoid interferon alfa-n1. Because another study of patients treated for one year with leukocyte interferon alfa-n3 found that the growth rate of papillomas was slowed in the first six months but returned to base line during months 7 through 12 despite persistent interferon treatment, we now report the long-term results in our original study patients who were followed for a median of four years after the original one-year crossover study.