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2014 ; 19
(9
): 98004
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Real-time monitoring of hemodynamic changes in tumor vessels during
photoimmunotherapy using optical coherence tomography
#MMPMID25253195
Liang CP
; Nakajima T
; Watanabe R
; Sato K
; Choyke PL
; Chen Y
; Kobayashi H
J Biomed Opt
2014[Sep]; 19
(9
): 98004
PMID25253195
show ga
Photoimmunotherapy (PIT) is a cell-specific cancer therapy based on an armed
antibody conjugate that induces rapid and highly selective cancer cell necrosis
after exposure to near-infrared (NIR) light. The PIT treatment also induces the
superenhanced permeability and retention effect, which allows high concentrations
of nanoparticles to accumulate in the tumor bed. In our pilot studies, optical
coherence tomography (OCT) reveals dramatic hemodynamic changes during PIT. We
developed and applied speckle variance analysis, Doppler flow measurement, bulk
motion removal, and automatic region of interest selection to quantify vessel
diameter and blood velocity within tumors in vivo. OCT imaging reveals that blood
velocity in peripheral tumor vessels quickly drops below the detection limit
while the vessel lumen remains open (4 vessels from 3 animals). On the other
hand, control tumor vessels (receive NIR illumination but no PIT drug) do not
show the sustained blood velocity drop (5 vessels from 3 animals). Ultraslow
blood velocity could result in a long drug circulation time in tumor. Increase of
the blood pool volume within the central tumor (shown in histology) may be the
leading cause of the periphery blood velocity drop and could also increase the
drug pool volume in tumor vessels.