The present invention relates to gelling compositions, which changes from liquid state to gel state in function of temperature comprising: at least a poloxamer or mixture of poloxamers at least a gelling agent and at least an anticancer agent. Said compositions are advantageously used for local administration of an anticancer agent. Said compositions are useful for size-reduction of a tumour before surgical removal of said tumour, for preventing tumour recurrence after surgical removal of a tumour, and/or treating small tumours. They are therefore useful for the treatment of cancer, preferably a cancer of a wall of the digestive system or a gynaecologic cancer. The present invention also relates to a method for preparing said gelling compositions.
