Estimation of volume doubling time and cell loss in an experimental rat glioma model in vivo.

Abstract:

:We estimated the volume doubling time (Vd) of the ethyl-nitrosourea-induced rat glioma by serial magnetic resonance imaging, and the results were compared with potential doubling time (Tp) determined immunohistochemically. Vd ranged from 3.3 to 29.2 days (11.3 +/- 7.74) and Tp ranged from 2.3 to 13.3 days (6.81 +/- 3.33). Each tumour showed a wide range of bromodeoxyuridine (BUdR) labelling indices (LI), however, Vd and Tp correlated well with BUdR-LI. Vd was estimated as 17.6 x BUdR-LI-0.63 (R = -0.76, P < 0.001, n = 13) and Tp was estimated as 22.6 x BUdR-LI-1.02 (R = -0.92, P < 0.0001, n = 12). In addition, we compared the apoptotic indices (AI), determined by terminal deoxynucleotidyltransferase (Tdt)-mediated biotinylated dUTP-biotin nick-end labelling (TUNEL) techniques, with BUdR-LI and mitoses indices (MI). The results were: AI = 0.23 + 0.25Ln(BUdR-LI) (R = 0.971, n = 8, P < 0.0001) and AI = 1.05 + 0.29Ln(MI) (R = 0.937, n = 8, P < 0.001). Cell loss factors (CLF) also correlated well with BUdR-LI and MI. However, CLF calculated from Tp and Vd were lower than the values previously presumed, probably because of shorter Vd than true doubling time for tumour cell population. These results suggest that even malignant tumours retain a mechanism of adjusting their growth at least partly.

journal_name

Acta Neurochir (Wien)

journal_title

Acta neurochirurgica

authors

Nakajima M,Nakasu S,Morikawa S,Inubushi T

doi

10.1007/s007010050148

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

607-12; discussion 612-3

issue

6

eissn

0001-6268

issn

0942-0940

journal_volume

140

pub_type

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