How do cytokines released by engineered tumour cells provoke tumour re
jection and an immune memory? Is vaccination with tumour cells that ha
ve been engineered to secrete cytokines a viable therapeutic perspecti
ve? Pier Musiani and colleagues have sought an answer to these questio
ns by transfecting the same tumour with the genes of various cytokines
and elucidating the features of the reactions elicited.