Abstract
Tumour-elicited host responses are of interest from at least two points of view: (i) they indicate an ability of the host to respond to the tumour, and (ii) they imply that the tumour is able to stimulate the host response. Both these factors may be part and partial of a specific or non-specific event. Nevertheless, with regard to the pathogenesis and therapy of malignant disease they would appear to be of paramount importance.