Present invention generally relates to nano¬particles comprising piece of therapeutic agent (1-(4-{[4-(dimethylamino)piperidin-1-yl]carbonyl} phe¬nyl)-3-[4-(4,6-dimorpholin-4-yl-1,3,5-triazin-2-yl)phenyl]urea), substantially hydrophobic acid and polymer selected from poly(lactic acid)-poly (ethylene)glycol diblock copolymer or poly(lactic acid coglycol acid) )-poly(ethylene)glycol diblock copolymer and combination thereof. Said invention relates to usage such nanoparticles for cancer treatment, as well.