Solid forms comprising 3-(5-amino-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione, compositions comprising the solid forms, methods of making the solid forms and methods of their uses are disclosed本發明揭示包含3-(5-胺基-2-甲基-4-氧基-4H-喹唑啉-3-基)-六氫吡啶-2,6-二酮之固體型式、包含該等固體型式之組合物、製造該等固體型式之方法及其使用方法。