Abstract
Tritiated thymidine (3HTdR) labeling is the standard technique for determining the kinetic activity of tumors. This method has been used to label multiple sections of tumor specimens obtained from seven patients with advanced squamous cell carcinoma of the head and neck. Considerable variability was observed in the labeling index in different sites from the same specimen. To reduce the large sampling error due to heterogeneity, we recommend that an average value be determined from multiple sections when employing this technique.
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