The present disclosure provides methods for treating chronic lymphocytic leukemia (CLL) with medicaments useful for same. The medicaments can be pharmaceutical compositions or kits comprising compounds of formula (I) or a salt, solvate or prodrug thereof. Specific compounds of the invention include 2-methyl-7-hydroxy-3-(3,4,5-trimethoxybenzoyl)-6-methoxybenzofuran which is also known as BNC105 and disodium 6-methoxy-2-methyl-3-(3,4,5-trimethoxybenzoyl)benzofuran-7-yl phosphate which is also known as BNC 105P.