Table 1 Changes in tumour volume, DW-MRI and DCE-MRI parameters between day 0 and day 3 in control and treated TOV-21G and TOV-112D xenografts

From: MRI reveals the in vivo cellular and vascular response to BEZ235 in ovarian cancer xenografts with different PI3-kinase pathway activity

 

TOV-21G

TOV-112D

 

Mean change control ( n =4)

Mean change BEZ235 ( n =8)

P -value

Mean change control ( n =4)

Mean change BEZ235 ( n =8)

P -value

Normalised volume (to day 0)

0.26±0.04

−0.15±0.09

<0.001

0.39±0.29

0.17±0.13

0.224a

Median ADC ( × 10−6 mm2 s−1)

−1.6±50

140±35

<0.001

0.2±13.7

−5.9±26

0.675

ADC skewness

0.2±0.1

−1.0±0.6

0.001 a

0.8±2.7

0.0±2.1

0.587

ADC kurtosis

0.6±0.3

−4.5±2.7

0.001 a

17.6±38.1

11.5±23.4

0.736

Median Ktrans ( × 10−3 min−1)b

−18±15

17±28c

0.050

−15±8

2±14

0.060

Median ve ( × 10−3)b

−33±12

131±70c

0.001

−8±6

19±16

0.002 a

Median vp ( × 10−3)b

−6.4±7.9

14.1±20.4c

0.091

−0.1±3.8

0.4±5.6

0.875

Median RSI1 minb

−0.4±0.4

0.6±0.7c

0.025

−0.2±0.2

0.1±0.2d

0.028

Median AUC1 min a.u.b

−7.1±6.4

15.4±17.2c

0.036

−11 .1±7.3

3.8±3.0d

0.001

FEV1 min (%)

−14±11

13±15c

0.011

−14±17

11±16

0.029

  1. Abbreviations: ADC=apparent diffusion coefficient; a.u.=arbitrary units; AUC1min=area under enhancement curve 1 min after injection; DCE-MRI=dynamic contrast-enhanced magnetic resonance imaging; DW-MRI=diffusion-weighted magnetic resonance imaging; FEV1 min=fraction of enhancing voxels (by 50% after 1 min); Ktrans=volume transfer constant; RSI1 min=relative signal intensity 1 min after injection; ve=extravascular extracellular space per unit volume of tissue; vp=blood plasma fraction.
  2. Values are given as group mean change±s.d. The P-values are derived from independent sample t-tests between the change of each parameter in the control and treatment groups.
  3. aNonequal variances (Levene’s test).
  4. bExcluding voxels for which RSI <50%.
  5. cN=7 because of unsuccessful contrast agent injection in one tumour.
  6. dN=7 because of higher contrast agent injection in one tumour.
  7. Bold values signifies P-value <0.05.