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Natural killer activity in thyroid cancer patients.

The natural killer activity of thyroid cancer patients has been studied. The cytotoxic capacity was found to be elevated in tumourless patients and in cases of highly differentiated histologic type compared to the results of patients with metastasis or anaplastic tumour. The values of patients in the progressive phase of the disease were significantly worse compared to the healthy controls. No connection was found between the natural killer activity and the time elapsed since the operation.