Cell kinetic classification of tumors of the nervous system by DNA precursor labeling in vitro

We studied 142 excisional or needle biopsy specimens of nervous system tumors with tritiated thymidine or 5′-bromodeoxyuridine (BrdUrd). Either precursor gave similar results. A labeling index (LI), expressed as a percentage and representing the S-phase fraction, was measured by a microscopic count...

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