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Ectopic Hormones-Biochemical Aspects

Biochemical evidence suggests that ectopic hormone production is much more common than suspected clinically. The majority of lung carcinomas of oat cell or carcinoid type appear to synthesise ACTH and related peptides, calcitonin and less frequently, chorionic gonadotrophin and vasopressin. The primary amino acid sequences of ectopic hormones closely resemble their normal counterparts but ectopic hormone producing tumours contain greater proportions of high molecular weight, subunit and fragment forms than the normal gland of origin. Assays for ectopic hormones are clinically useful in diagnosis, tumour localisation, and monitoring patients with ectopic hormonal syndromes. Currently the clinical value of hormone assays in the routine management of common forms of malignancy in the absence of overt ectopic hormonal syndromes is unproven. However, better characterisation of hormonal forms relatively specific for neoplasia together with improved assay specificity and sensitivity may enhance the clinical value of ectopic hormones as tumour markers, particularly in malignancies which are commonly associated with ectopic hormone production (e.g. lung cancer).