Water soluble polymeric conjugates of antitumor agents of formula (A) P-[W
2
]
p
-S
0
-[W
1
]
r
-[D] wherein: P is a water soluble polymer; [W
1
] is a residue of formula —HN-Z
1
-CO— in which Z
1
represents a linear or branched C2-C12 alkylene chain or the residue of formula —C6HC—CH2—O—; [W
2
] is a residue of formula —HN-Z2-CO— in which Z2 represents a C2-C12 linear or branched alkylene chain; p and r are 0 or 1; S0 is a peptide that selectively is cleaved at the tumor site mainly by the action of the matrix metalloproteinases gelatinase; [D] is the residue of an antitumor agent. The conjugates possess enhanced antitumor activity and decreased toxicity with respect to the free drug. A process for their preparation, useful intermediates and pharmaceutical compositions containing them are also described.
公式(A)P-[W2]p-S0-[W1]r-[D]的抗肿瘤剂
水溶性高分子共轭物中:P是一种
水溶性高分子;[W1]是
化学式—HN-Z1-CO—的残基,其中Z1表示线性或支链的C2-C12烷基链或
化学式—C6HC—
CH2—O—的残基;[W2]是
化学式—HN-Z2-CO—的残基,其中Z2表示C2-C12线性或支链烷基链;p和r为0或1;S0是一种肽,在肿瘤部位主要由基质
金属
蛋白酶明胶酶作用选择性裂解;[D]是抗肿瘤剂的残基。这些共轭物具有增强的抗肿瘤活性和相对于自由药物而言的降低毒性。还描述了它们的制备过程、有用的中间体和包含它们的药物组合物。