Composition for the treatment of cancer with controlled release of the drug

The present invention relates to a novel composition for the treatment of cancer, which allows the active ingredient in the immediate presence of the release agent with the cells to be treated. The composition comprising comprising an active agent carrier in the form of a liposome, a disulfide group, wherein an antineoplastic agent is in the active ingredient carriers. The invention also relates to a process for the localized release of a cytostatic agent.