The present invention discloses an improved method for expansion andactivation of tumour-reactive lymphocytes, in particular CD4+ helper and/orCD8+ T-lymphocytes, which may be used for treating and/or preventing cancer.The method provides high numbers of tumour-reactive T-lymphocytes within ashort time span and the possibility of directing development of tumour-reactive CD4+ helper and/or CD8+ T-lymphocytes towards specificsubpopulations. The method comprises a first phase of stimulating tumour-reactive CD4+ T helper and/or CD8+ T-lymphocytes with tumour-derived antigentogether with at least one substance having agonistic activity towards the IL-2 receptor to promote survival of tumour-reactive CD4+ T helper and/or CD8+ T-lymphocytes and a second phase of activating and promoting growth of tumour-reactive CD4+ T helper and/or CD8+ T-lymphocytes, wherein the second phase isinitiated when the CD25 cell surface marker (or IL-2R marker) is down-regulated on CD4+ T helper and/or CD8+ T-lymphocytes.
