Immunocytokine comprising cytokine, e.g. interleukin 2 (IL-2), conjugated to antibody against tumour neovasculature antigen, e.g. tenascin-C, for use in combination therapy with chemotherapeutic agent such as temozolomide. Use of immunocytokine and chemotherapy for treatment of tumours e.g. glioblastoma and other cancers.