The present invention describes specific crystalline forms of 5-chloro-N-(2-isopropoxy-5-methyl-4-(piperidin-4-ylphenyl)-N-2-(isopropylsulfonyl)phenyl)-2,4-diamine. The present invention further relates to methods for preparing said crystalline forms, pharmaceutical compositions comprising said crystalline forms, and methods of using said crystalline forms and pharmaceutical compositions to treat disease.本發明闡述一種5-氯-N-(2-異丙氧基-5-甲基-4-(六氫吡啶-4-基苯基)-N-2-(異丙基磺醯基)苯基)-2,4-二胺之特定結晶型式。本發明另外係關於製備該等結晶型式之方法、包括該等結晶型式之醫藥組合物及使用該等結晶型式及醫藥組合物治療疾病之方法。