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The levels of N-acetyl neuraminic acid (sialic acid) in normal men and pre-and post-menopausal women were determined. Smoking, post-menopausal estrogen therapy, oral contraceptives, and refreezing had no effects on sialic acid levels. Pre-treatment values from patients with lung carcinoma showed markedly elevated levels of sialic acid (0.697 ± 0.149 μM/ml) as compared to those from normal controls (0.432 ± 0.067 μM/ml). The potential usefulness of sialic acid as a biological marker is discussed.

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