The present application relates to polymorphic forms 1 to 4 of compound A: 3-(3-(4-(l-aminocyclobutyl)phenyl)-5-phenyl-3H-imidazo[4,5-b]pyridin-2-yl)pyridin-2-amine. The present application also relates to pharmaceutical compositions comprising these polymorphic forms, methods for their preparation and use thereof for treating or preventing a cell proliferative disorder.
