The present invention provides a novel thermosensitive cyclotriphosphazene-platinum complex conjugates represented by Formula (1) wherein m is a repeating unit of poly(alkoxyethylene glycol) selected from the integers 2, 7 and 12; n represents the length of the alkyl chain selected from the integers 0, 1, 2 and 3; x represents the length of the anionic amino acid residue selected from the integers 0 (amino malonic acid derivatives), 1 (aspartic acid derivatives) and 2 (glutamic acid derivatives); A2 is a bidentate chelating diamine selected from the group consisting of 2,2-dimethyl-1,3-propanediamine (dmpda), trans(+/-)-1,2-diaminocyclohexane (dach) and 1,1-diaminomethylcyclohexane (dmach). |