Active immunotherapy in treatment of acute leukaemia.

Active non-specific immunotherapy has been used to prolong remissions in acute lymphoblastic leukaemia. The series reported here used Bordetella pertussis vaccine in a controlle trial after intensive chemotherapy. Possibly immunotherapy delayed the onset of relapse in the treated patients, but no long-term remissions were obtained. Further work is needed to establish the role of immunotherapy in general, and the use of B. pertussis vaccine in particular, in the treatment of acute leukaemia.