Abstract: The invention describes compositions and methods of use for 2,5-dihydroxybenzene sulfonic acid compounds and pharmaceutically acceptable salts thereof. The invention provides methods for (a) treating skin cancer; (b) treating cancer of the organs; (c) treating leukemia; (d) improving the efficacy of chemotherapy, radiation therapy and/or cancer immunotherapy; (e) treating rosacea; and (f) treating psoriasis by administration of a composition comprising at least one 2,5-dihydroxybenzene sulfonic acid compound or a pharmaceutically acceptable salt thereof, and, optionally at least one therapeutic agent. Also disclosed are compositions comprising administration of at least one 2,5-dihydroxybenzene sulfonic acid compound, or a pharmaceutically acceptable salt thereof, and, at least one therapeutic agent.

Abstract: A naphthalenesulfonic acid or quinolinesulfonic acid of formula (I), wherein A is N or a CR8 formula group, where R8 is H, OH, NR10R11, independently from one another, where R10 and R11 represent H or C1-C6 alkyl or a group of formula NH—CO—R12, where R12 is C1-C6 alkyl or C6-C10 aryl; R1 and R2 represent H or SO3R9, independently from one another, where R9 is H, ammonium or a cation of an alkali or alkaline-earth metal; R3 is H or OH; and R4, R5, R6 and R7 represent H, an NR10R11 or NH—CO—R12 group, independently from one another; on the condition that (i) at least one of R1 or R2 is SO3R9, and (ii) at least one of R4, R5, R6 or R7 is an NR10R11 or NH—CO—R12 group, or their pharmaceutically acceptable salts; and a pharmaceutically acceptable excipient.