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The addition of radioimmunoassay of beta 2-microglobulin (beta 2-MG) from the sera of patients with infiltrative pulmonary tuberculosis to the complex of clinical, x-ray, ultrasound, cytological and biochemical examinations contributes to early detection of renal dysfunction which is important in phthisiology. Changes in urinary and blood serum values of beta 2-MG may serve as a screening test for different nephropathies.

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The ISOBM TD-6 Workshop is the first international workshop on monoclonal antibodies against the Sialyl Lewisa (SLea) antigen. Eight research groups participated in a blind study to characterize the epitope binding, relative affinity and performance in immunoradiometric assays, of a panel of 20 monoclonal antibodies. The antibodies were tested against a diverse panel of neoglycoconjugates, purified antigens and human serum pools from gastrointestinal malignancies. Epitope specificities were determined for the majority of antibodies in the panel. Cross-reactivity with related saccharide structures was noted in several antibodies. Overall, the results of the TD-6 Workshop show further development of SLea immunoassays may yield yet more specific assays for the detection and management of gastrointestinal and other malignancies.

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4-methoxy-beta-naphthylamide and 7-amino-4-methyl coumarin, derivatives of Z-Ala-Arg-Arg, Leu- and Gly-Phe-beta-naphthylamides were used as substrates in estimation of peptide hydrolases activity in blood serum of patients with malignant tumors and glomerulonephritis in order to ascertain their efficiency for diagnostic purposes in clinic. Each of the fluorogenic substrates studied was hydrolyzed by various peptide hydrolases from blood serum both under normal and pathological conditions: metallopeptidases, cysteine- and serine-dependent peptide hydrolases. The rate of Z-Ala-Arg-Arg-MNA hydrolysis was decreased in lung, kidney and ileum cancer as well as in glomerulonephritis as compared with normal state. The "alkaline-resistant" cysteine-dependent cathepsin B-like proteinase, hydrolyzing this peptide, was not detected in blood serum neither in normal state nor in these diseases studied. Leu-NA and Gly-Phe-NA were hydrolyzed most effectively in blood serum of patients with lung cancer and glomerulonephritis as compared with normal state; cysteine-dependent peptide hydrolases were most markedly activated. Alterations in the enzymatic activity, detected in blood serum, did not exhibit any specificity for definite diseases, they were observed both in malignant and inflammatory impairments. The data obtained suggest that the fluorogenic substrates studied could not be suitable for clinico-diagnostic purposes.

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A radioimmunoassay was used for a comparative study of CEA concentrations in the blood serum and bronchoalveolar washes-off in patients with lung cancer (27) and nontumorous lung disease (with bronchitis-14, pneumonia-18, tuberculosis-11, disseminated processes of nontumorous etiology.-12) and in persons without lung pathology (7). Diagnostic sensitivity of CEA determination in the washes-off was 89%, in the blood serum 33%; the specificity was 86 and 56.5%, respectively. The resultant diagnostic accuracy using washes-off was 86%, i.e. almost twice as high as compared to the blood serum (44.7%). Such a high accuracy in CEA determination in the bronchoalveolar washes-off provides an opportunity to use the method for differential diagnosis in unclear cases and for defining groups at high risk of developing lung cancer. The combination of a high level of CEA with unfavorable signs like basal cell hyperplasia, epidermoid metaplasia necessitate patients' follow-up.

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Radioimmunoassays were employed to determine somatotrophin (STH) and somatostatin (SS) levels in patients with different types of tumors. In all patients with solid tumors and in 19 out of 25 patients with lympoblastoses SS concentration was elevated and ranged from 15 to 70 pg/ml. STH level in all cancer patients, with few exceptions, before and during treatment was within normal varying from 0.5 to 6 ng/ml. No distinct correlation between STH and SS levels was found. Proceeding from an analysis of the results obtained it is to be assumed that a study of SS behavior in cancer patients may hold promise in terms of the diagnosis and assessment of the efficacy of cancer therapy.

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In patients with chorionepithelioma as distinct from the normal postnatal period hypothalamohypophyseal function has been shown to get loose without the parallel elimination of the hormones of the fetoplacental complex from the body, particularly of chorionic gonadotrophin.

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A simultaneous determination of 3 gonadotropic hormones of the hypophysis (follitropin, lutronin and prolactin) using a radioimmunoassay in 33 patients with trophoblastic uterine tumors and 22 women on the 1st-8th day after normal delivery, has shown that there are not only significant differences in the nature of the secretion of hypophyseal gonadotropic hormones in pathology as compared to the normal postnatal period but also differences in different forms of trophoblastic tumors. These differences were characterized by a progressive, according to the severity of disease, independence between trophoblastic tissue function and gonadotropic function of the hypophysis. A marked suppression of follicle-stimulating function of the hypophysis after normal delivery decreased hydatidiform mole and trophoblastic tumors and was not observed in patients with chorioepithelioma of the uterus.

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