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Abstract
Future effective therapies for hepatic metastases may depend on a better understanding
of perfusion to these tumors. The purpose of this project was to define blood flow
to colorectal cancer liver metastases using quantitative autoradiography (QAR). Liver
tumors were established in F1hybrids of WF × BN rats by intrasplenic injection of a DMH-induced rat colon adenocarcinoma.
Rats underwent laparotomy 4–5 weeks later and [14C]iodoantipyrine (a radiotracer) was infused via the hepatic artery (HA) or portal
vein (PV). Livers were harvested, frozen in liquid nitrogen, and sectioned at 20 μm
through all tumors. QAR compared optical density of cross sections of tumors to surrounding
normal liver tissue. Tumor:liver perfusion ratios (T/L PR) and tumor center:tumor
periphery perfusion ratios (C/P PR) were calculated. All groups were analyzed with
regard to tumor location and size. Seventy-seven tumors in 6 rats in the HA infusion
group were analyzed; 74 tumors in 8 rats in the PV group were analyzed. Statistical
analysis was by repeated measures analysis of variance. Mean HA T/L PR = 0.97 ± 0.13,
mean PV T/L PR = 0.25 ± 0.11. Mean HA T/L PR for deep tumors was 1.38 ± 0.17 and for
superficial tumors was 0.57 ± 0.15 (P< 0.01). Mean HA T/L PR for small tumors was 1.09 ± 0.12 and for large tumors was
0.86 ± 0.21 (P= 0.27). Mean PV T/L PR for deep tumors was 0.27 ± 0.14 and for superficial tumors
was 0.24 ± 0.15 (P= 0.71). Mean PV T/L PR for small tumors was 0.31 ± 0.15 and for large tumors was
0.20 ± 0.14 (P= 0.54). Mean HA C/P PR = 1.15 ± 0.15, mean PV C/P PR = 0.81 ± 0.14 (P= 0.06). Mean HA C/P PR for small tumors was 1.37 ± 0.16 and for large tumors was
0.92 ± 0.17 (P= 0.01). Mean PV C/P PR for small tumors was 0.78 ± 0.18 and for large tumors was
0.72 ± 0.13 (P= 0.71). HA perfusion of tumors is significantly higher than PV perfusion compared
to surrounding normal liver tissue. HA perfusion varies significantly depending on
tumor location.There was a trend toward HA perfusion to the tumor center being slightly
greater than to the periphery whereas the reverse was seen for PV perfusion. Tumor
size did not affect overall perfusion but it did affect regional HA tumor perfusion.
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© 1997 Academic Press. Published by Elsevier Inc. All rights reserved.