The developed technique of PTX sustained delivery from PHB-microparticles has therapeutic potential as prolong anticancer drug formulation.

The research is devoted to the study of the efficacy of new Russian microspheres loaded by (MC/DOX) of 0.4-0.6 mm diameter on a basis of cryogel with poly(vinyl alcohol) intended for a transarterial chemoembolization (TACE). MC/DOX in dose of of 0.5-1.0 ml contained Doxorubicin of 16 mg or 32 mg were transarterially injected in a single dose to rabbits (n = 24) with the VX2 anaplastic carcinoma of the moderate volume of 3-5 cm2 which developed in femur muscles (the pool of a femoral artery). The time of complete released of DOX was 16 days up to dose (a cumulative dose) 16 and 32 mg, respectively. The efficacy was controlled with the decrease of the tumor growth rate and significant inhibition through embolization of turnpike blood of a tumor zone under radiological monitoring. MC/DOX were shown both to give rise in the regression of tumor nodes and reduce the growth rate by 2.0-2.5 times in dependence on the dose value. The reliable therapeutic prize of MC/DOX against embolization effect of 0.5 ml MC that achieved at the maximal DOX cumulative dose of 32 mg consists in the achievement of regression of VX2 up to 50% at 5 of 6 rabbits with the development of the cure pathomorphological effect of III degree which is characterized by the gain in the area of a necrosis by 1.5-3.0 times. The maximal efficient cumulative dose of 32 mg Doxorubicin exceeds value of Maximum Planned Dose (MPD) of Doxorubicin by 6 times for systemic injection to rabbits. The embolizing effect of MC/DOX in the form of blocking of shallow arterioles at preservation of turnpike blood supply did not depend on the size of the applied dose. The reliable antineoplastic effect revealed on this model allows good out perspective for a transarterial chemoembolization of a tumor with MC/DOX.