C: NRPortbl DCC GRS 5068662_1.DOC-4 11 2013 BIORESORBABLE EMBOLIZATION MICROSPHERES The present disclosure is generally directed to an embolic material which is in the form of a microsphere or a plurality of microspheres. The embolic material generally comprises carboxymethyl chitosan (CCN) crosslinked with carboxymethyl cellulose (CMC). In some embodiments, the embolic material may further comprise a therapeutic agent, such as doxorubicin.