Solid forms comprising 2-(4-chlorophenyl)-N-((2-(2,6-dioxopiperidin-3-yl)-1- oxoisoindolin-5-yl)methyl)-2,2-difluoroacetamide, 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2-(4-氯苯基)-N-((2-(2,6-二氧六氫吡啶-3-基)-1-氧基異吲哚啉-5-基)甲基)-2,2-二氧乙醯胺之固體型式、包含該等固體型式之組合物、製得該等固體型式之方法及其使用方法。