This disclosure provides methods for formulating compositions comprising one or more peptide proteasome inhibitors and a cyclodextrin, particularly a substituted cyclodextrin. Such methods substantially increase the solubility and stability of these proteasome inhibitors and facilitate both their manufacture and administration.本發明提供用於調配包含一或多種胜肽蛋白酶體抑制劑及環糊精(尤其是經取代之環糊精)之組成物的方法。該等方法實質上提高該等蛋白酶體抑制劑之溶解度及穩定性且有助於其製造及投藥。