Measurement of cell kinetics in human tumours in vivo using bromodeoxyuridine incorporation and flow cytometry

The proliferative potential of human solid tumours, in vivo, was investigated using bromodeoxyuridine (BrdUrd) incorporation and flow cytometry (FCM). Patients with solid tumours from a variety of sites were injected with 500 mg BrdUrd, intravenously, several hours prior to biopsy or surgical excision. The labelling index (LI), duration of S-phase (Ts) and thus the potential doubling time (Tpot) could be measured within 24 h of sampling. The results show that both the LI and Ts vary greatly between tumours (Ts ranges from 5.8 to 30.7 h). However, within this study of 26 evaluable patients, tumours of the same tissue origin tended to have similar Ts values. Melanomas had the shortest Ts (8.8 h), nine patients with head and neck cancer had Ts values ranging from 5.8 to 18.8 h (median 12.5 h). The longest Ts values (24 h) were found in lung and rectum. The estimates of Tpot ranged from only 3.2 days in an oat cell carcinoma to 23.2 days in a lymphoma. The striking feature of the study was that 38% of the tumours had a potential doubling time of 5 days or less. We found no relationship between proliferation and histopathological differentiation or DNA ploidy. It should now be possible to assess the prognostic significance of pretreatment cell kinetic measurements which may, in the future, aid in the selection of treatment schedules for the individual patient.

Abstract licence: CC BY

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