The relationship of serum blocking activity and susceptibility to tumour recurrence using E-rosette inhibition by normal allogenic lymphocytes was evaluated before and after operation in 20 patients with early breast cancer. Preoperative serum inhibition levels did not predict recurrent tumour. The mean postoperative inhibition in patient with recurrence was significantly greater than in those without recurrence. Postoperative testing only in a group of 124 patients showed that the development of local tumour recurrence was preceded by significantly greater inhibition of E-rosetting than occurred in patients without recurrence. The application of a threshold level of serum inhibition of 15 per cent distinguishes patients who are unlikely to develop tumour recurrence over a 4-year follow-up period. Serial measurements of serum inhibition at 6-monthly intervals over 2 years did not add to the predictive value of this test.

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