CYTOTOXIC AGENTS BEARING A REACTIVE POLYETHYLENE GLYCOL MOIETY, CYTOTOXIC CONJUGATES COMPRISING POLYETHYLENE GLYCOL LINKING GROUPS, AND METHODS OF MAKING AND USING THE SAME
CYTOTOXIC AGENTS COMPRISING NEW ANSAMITOCIN DERIVATIVES
申请人:ImmunoGen, Inc.
公开号:US20160058882A1
公开(公告)日:2016-03-03
New ansamitocin derivatives bearing a linking group are disclosed. Also disclosed are methods for the synthesis of these new ansamitocin derivatives and methods for their linkage to cell-binding agents. The ansamitocin derivative-cell-binding agent conjugates are useful as therapeutic agents, which are delivered specifically to target cells and are cytotoxic. These conjugates display vastly improved therapeutic efficacy in animal tumor models compared to the previously described agents.
Cytotoxic agents bearing a reactive polyethylene glycol moiety, cytotoxic conjugates comprising polyethylene glycol linking groups, and methods of making and using the same
申请人:Immunogen Inc.
公开号:US06716821B2
公开(公告)日:2004-04-06
Cytotoxic agents bearing a polyethylene glycol (PEG) linking group having a terminal active ester, cytotoxic conjugates comprising one or more cytotoxic agents linked to a cell-binding agent via PEG linking groups, and methods for producing both are disclosed. A therapeutic composition comprising a therapeutically-effective amount of one of the cytotoxic conjugates of the present invention, and a method of killing selected cell populations comprising contacting target cells, or tissue containing target cells, with an effective amount of one of the cytotoxic conjugates, are also disclosed.
Linkers for binding drugs to cell binding agents are modified to hydrophilic linkers by incorporating a polyethylene glycol spacer. The potency or the efficacy of the cell-binding agent-drug conjugates is surprisingly enhanced several folds in a variety of cancer cell types, including those expressing a low number of antigens on the cell surface or cancer cells that are resistant to treatment. A method for preparing maytansinoids bearing a thioether moiety and a reactive group which allows the maytansinoid to be linked to a cell-binding agent in essentially a single step is also provided.