This invention relates to staurosporine derivatives are effective when used in combination with ionizing radiation for the delay of progression or treatment of a proliferative disease, especially a disease associated with a PAX/FKHR translocation including a PAX3/FKHR translocation and a PAX7/FKHR translocation, more especially a solid tumor disease such as a Sarcoma, most especially an Alveolar Rhabdomyosarcoma.