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To determine the rate of recurrence and associated risk factors after the use of mitomycin C (MMC), interferon alpha-2b, or both for management of noninvasive ocular surface squamous neoplasia (OSSN).

Retrospective, noncomparative, interventional case series.

Clinical practice setting of 135 patients treated consecutively with topical MMC (0.4 mg/mL), interferon alpha-2b (1 million units/mL), or both for OSSN observed for clinical recurrence.

Clinical recurrences were diagnosed in 19 (14.1%) of 135 eyes after topical treatment. The mean time to recurrence was 17.2 months (range, 4 to 61 months), with 14 eyes (73.7%) recurring within a 2-year period. There was no greater risk of recurrence identified for variables including lesion size, lesion location, gender, age, treatment type, or treatment duration. Post hoc log-rank pairwise comparisons revealed that lesions initially treated …