It is established that histamine in the concentration of 10(-4)-10(-5) M possesses an inhibitory effect in the lymphocyte adherence inhibition test in patients with breast cancer. Using specific antagonists (H1-blocker dimedrol and H2-blocker cimetidine) it is shown that the revealed histaminergic suppression of the lymphocyte adherence inhibition is mediated through the stimulating influence of histamine on H2-receptors.
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