Background:

Minimum Inhibitory Concentration: 1, 1, 0.5, 0.25, and 0.25 μg/mL for T.rubrum, T.mentagrophytes, C.albicans, C.neoformans, A.fumigatus, respectivley.

AN2690 is a new boron-containing antifungal agent for the potential treatment of onychomycosis. Onychomycosis is caused mainly by dermatophytes, a class of fungus that dwells on skin, hair, and nails and is the cause of other cutaneous fungal infections such as athlete’s foot.

In vitro: AN2690 showed the most active against fungi and especially against the dermatophytes T. rubrum and T. mentagrophytes, the primary fungal pathogens causing onychomycosis. In addition, AN2690 was identified as having a unique profile of in vitro antidermatophyte activity, maintenance of this activity in the presence of keratin, and exceedingly good penetration of human nails [1].

Ex vivo: AN2690 was found to have superior penetration compared to ciclopirox, and achieves levels within and under the nail plate that suggest it has the potential to be an effective topical treatment for onychomycosis [2].

Clinical trial: The efficacy of tavaborole as a topical treatment for onychomycosis has been evaluated in two identical randomised, double-blind phase III studies, NCT01270971 (301) and NCT01302119 (302), enrolling 593 and 601 patients, respectively. Completely or almost clear nail and negative mycology was achieved in 15.3 and 17.9 % of tavaborole recipients compared with 1.5 and 3.9 % of vehicle recipients [3]

参考文献:
[1] Baker SJ, Zhang YK, Akama T, Lau A, Zhou H, Hernandez V, Mao W, Alley MR, Sanders V, Plattner JJ.  Discovery of a new boron-containing antifungal agent, 5-fluoro-1,3-dihydro-1-hydroxy-2,1- benzoxaborole (AN2690), for the potential treatment of onychomycosis. J Med Chem. 2006;49(15):4447-50.
[2] Hui X, Baker SJ, Wester RC, Barbadillo S, Cashmore AK, Sanders V, Hold KM, Akama T, Zhang YK, Plattner JJ, Maibach HI.  In Vitro penetration of a novel oxaborole antifungal (AN2690) into the human nail plate. J Pharm Sci. 2007;96(10):2622-31.
[3] Markham A.  Tavaborole: first global approval. Drugs. 2014;74(13):1555-8.