Author:
Lorza Andres M. Arias,Ravi Harshan,Philip Rohit C.,Galons Jean-Philippe,Trouard Theodore P.,Parra Nestor A.,Von Hoff Daniel D.,Read William L.,Tibes Raoul,Korn Ronald L.,Raghunand Natarajan
Abstract
AbstractThe vascular disrupting agent crolibulin binds to the colchicine binding site and produces anti-vascular and apoptotic effects. In a multisite phase 1 clinical study of crolibulin (NCT00423410), we measured treatment-induced changes in tumor perfusion and water diffusivity (ADC) using dynamic contrast-enhanced MRI (DCE-MRI) and diffusion-weighted MRI (DW-MRI), and computed correlates of crolibulin pharmacokinetics. 11 subjects with advanced solid tumors were imaged by MRI at baseline and 2–3 days post-crolibulin (13–24 mg/m2). ADC maps were computed from DW-MRI. Pre-contrast T1 maps were computed, co-registered with the DCE-MRI series, and maps of area-under-the-gadolinium-concentration-curve-at-90 s (AUC90s) and the Extended Tofts Model parameters ktrans, ve, and vp were calculated. There was a strong correlation between higher plasma drug $${C}^{max}$$
C
max
and a linear combination of (1) reduction in tumor fraction with $${AUC}_{90s}>15.8$$
AUC
90
s
>
15.8
mM s, and, (2) increase in tumor fraction with $${v}_{e}<0.3$$
v
e
<
0.3
. A higher plasma drug AUC was correlated with a linear combination of (1) increase in tumor fraction with $${\text{ADC}} < 1.1 \times 10^{ - 3} \;{\text{mm}}^{2} /{\text{s}}$$
ADC
<
1.1
×
10
-
3
mm
2
/
s
, and, (2) increase in tumor fraction with $$v_{e}<0.3$$
v
e
<
0.3
. These findings are suggestive of cell swelling and decreased tumor perfusion 2–3 days post-treatment with crolibulin. The multivariable linear regression models reported here can inform crolibulin dosing in future clinical studies of crolibulin combined with cytotoxic or immune-oncology agents.
Funder
National Institutes of Health
Publisher
Springer Science and Business Media LLC
Cited by
11 articles.
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