The disclosure relates to various polymorphic forms and amorphous form of sodium 4-((3-(4-cyclohexylpiperazin-1-yl)-6-oxo-6H-anthra[1,9-cd]isoxazol-5-yl)amino)benzoate, including the polymorphic form A, mixtures of the polymorphs, process for the preparation thereof and the use thereof in a pharmaceutical composition containing thereof.