Pharmaceutical compositions and single unit dosage forms of {2-[(IS)-1-(3-ethoxy-4-methoxy-phenyl)-2-methanesulfonyl-ethyl]-3-oxo-2,3-dihydro-1H-isoindol-4-yl}-amide, or a pharmaceutically acceptable stereoisomer, prodrug, salt, solvate, hydrate, or clathrate thereof, are provided herein. Also provided are methods of treating, managing, or preventing various disorders, such as cancer or an inflammatory disease.