A water-insoluble controlled-release PRRA, its pharmaceutically acceptable salt or a pharmaceutical composition comprising such water-insoluble controlled-release PRRA or its pharmaceutically acceptable salt for use in the treatment of a cell-proliferation disorder, wherein the water-insoluble controlled-release PRRA is administered by intra-tissue administration and wherein the maximum mRNA expression levels of at least 4 genes selected from the group consisting of TNF, IL1A, IL1B, IL10, IL6, IL12B, CCL2, CCL8, CCL3, CCL4, CXCL2, CCL20, CSF2, pan-IFNA subtype members, IFNB1, IL18, CCL5, CXCL10 and CXCL1 in peripheral blood mononuclear cells within 24 hours after such intra-tissue administration are more than 1.5-fold lower than after intra-tissue administration of an equivalent molar dose of the corresponding free PRRA.