Abstract
The mast cell content of sarcomata induced chemically in inbred rats showed wide variation. After first passage into a normal syngeneic recipient, primary tumours which were heavily infiltrated showed a complete absence of mast cells. Moreover, detectable anaphylactic antibody to passaged tumours was only occasionally detected. An important immunological role for the IgE/mast cell system in host-tumour defence is not supported.

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