Prognostic Factors for Complete Cure Following Treatment of Mild and Moderate Toenail Onychomycosis With Efinaconazole Topical Solution 10%

August 2015 | Volume 14 | Issue 8 | Original Article | 871 | Copyright © 2015

Nathaniel J. Jellinek MD FAAD FACMSa and Andrew Korotzer PhDb

aDermatology Professionals Inc, East Greenwich, RI
bValeant Pharmaceuticals, Bridgewater, NJ

Abstract

OBJECTIVE: To identify those patients who are more likely to achieve treatment success with efinaconazole topical solution 10% based on clinical improvement and mycological status during treatment.
METHODS: A subgroup analysis of patients, aged 18 to 70 years, randomized to receive efinaconazole topical solution 10% or vehicle from 2 identical multicenter, double-blind, vehicle-controlled 48-week studies evaluating safety and efficacy. The primary end point, complete cure rate (0% clinical involvement of target toenail, and both negative potassium hydroxide examination and fungal culture) at week 52 was evaluated based on mycologic cure at week 24, and the degree of clinical improvement in nail involvement at week 12.
RESULTS: Over a quarter (25.1%) of patients treated with efinaconazole topical solution 10% who could demonstrate at least 10% improvement in affected nail involvement by week 12 progressed to complete cures at week 52. Similarly, 21.7% of patients who demonstrated mycologic cure at week 24 achieved complete cures at week 52.
CONCLUSIONS: Early clinical improvement and mycologic clearance may help to predict treatment success with efinaconazole topical solution 10%.

J Drugs Dermatol. 2015;14(8):871-875.

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INTRODUCTION

Onychomycosis is the most common nail disease in adults, representing up to 50% of all nail disorders, nearly always being associated with tinea pedis.1-3 Epidemiologic data indicate a prevalence of 13.8% in the United States,4 with a number of factors contributing to an increasing incidence.5 Onychomycosis is more common in males than females, in people with human immunodeficiency virus, with diabetes, and with increasing age.6 Other predisposing factors include immunosuppression, peripheral arterial disease, sports activities, and pre-existing dystrophic nails from a variety of causes including psoriasis and trauma.7

With appropriate treatment, in many individuals the normal clinical appearance of the nails can be restored over time. However, sustained and complete cure rates can be disappointing,8 slow to achieve, and with disease relapse seen frequently.9 Indeed, these factors present some of the biggest challenges in the management of the disease.

It would be valuable to identify patients who are likely to fail treatment so that alternative and individualized treatment regimens can be formulated. Conversely, identifying those patients who are more likely to achieve a total cure would be helpful to maintain patient motivation with a treatment lasting many months.

Several factors influence the likelihood of treatment success: clinical subtype of onychomycosis, age, and peripheral vascular disease; and the speed of nail growth, extent of nail involvement, increased number of nails involved, and presence of a dermatophytoma have all been suggested to influence treatment efficacy.10,11 Patients with matrix or lateral nail plate involvement, slow nail growth, or a dermatophytoma are less likely to reach complete cure.10 Patients exhibiting a faster nail outgrowth are likely to show better treatment response;12,13 although not all studies have found a link between rate of nail growth and treatment cure.14 The presence of a dermatophytoma has often been suggested to negatively affect cure, but definitive statistical support is lacking.12,15,16 In general, there are no widely accepted prognostic factors that have been proven and replicated, with significant disagreement between different studies performed.

Reasons for treatment failure are not always clear cut. There is little evidence that treatment failures can be identified on the basis of clinical presenting features or progress during treatment. A study of 496 patients examined the influence of age, gender, and extent of disease, previous treatment, and duration of infection, and was unable to identify any predictive factors; although having a positive mycology 12 weeks into treatment was associated with treatment failure.17

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