The invention provides an anti-
cancer sustained-
release agent co-carrying 
glucocorticoid and 
chemotherapeutic drugs and belongs to sustained-release injections. The anti-
cancer sustained-
release agent comprises sustained-release microspheres and a 
solvent, wherein, the sustained-release microspheres comprise anti-
cancer active components and sustained-release auxiliary materials; and the 
solvent is a particular 
solvent containing a suspending agent. The 
glucocorticoid is selected from 
prednisolone, 
methylprednisolone, 
dexamethasone, betemethasone, 
triamcinolone acetonide or 
triamcinolone acetonide; the 
chemotherapeutic drugs are selected from phosphoinositide 3-
kinase inhibitor, 
pyrimidine analogues and the like; the sustained-release auxiliary materials are biocompatible high-polymers, such as 
polylactic acid and the copolymers thereof, 
polyethylene glycol, carboxyl-terminated 
polylactic acid copolymers, polyfatty acid 
dimer-
sebacic acid copolymers, poly(
erucic acid dimer-
sebacic acid), poly(fumaric-co-
sebacic acid), polifeprosan and the like; and the suspending agent with the 
viscosity being 100cp to 3,000cp (at the temperature of 20 to 30 DEG C) is selected from 
sodium carboxymethyl cellulose and the like. The anti-cancer 
active components and the sustained-release microspheres can further be prepared into sustained-release implants which can effectively inhibit the growth of tumors, alleviate 
edema and improve the curative effects of radiotherapy and 
chemotherapy by intra-tumor or peri-tumor injection or placement.