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[Search for a new antigen associated with oncornavirus D in human breast cancer tumors].

An antigen similar in its specificity to a nonvirion antigen emerging in stationary tissue culture cells spontaneously or experimentally infected with oncornavirus D was found in mammary gland cancer tumour tissues of 9 out of 54 examined patients. This virus-associated antigen was absent in 17 examined specimens of benign tumours of the same localization (fibroadenomas, mastopathies) or in the organs of a normal adult man or human embryo.