Effect of irradiation on bromodeoxyuridine incorporation in human colon cancer xenografts.
OBJECTIVE
Although we have characterized the incorporation of the thymidine analog bromodeoxyuridine (BrdUrd) into human colon cancer xenografts under a wide variety of conditions, little is known about the effect of radiation on subsequent incorporation. Because clinical protocols include, as one component, BrdUrd administration after radiation, it was important to confirm that irradiation did not prevent subsequent BrdUrd incorporation. Therefore, we studied the effect of irradiation on BrdUrd incorporation into HT29 human colon cancer xenografts.


METHODS
Two types of experiments were performed. In the first, the effect of radiation on subsequent incorporation was measured. Tumors received doses of 0, 2, 8, and 12 Gy, animals were infused with BrdUrd for 4 days, and incorporation was assessed at the end of the infusion. In the second, the effect of radiation on the elimination of BrdUrd from tumors was determined. Animals were infused with BrdUrd, tumors were irradiated with either 0 or 12 Gy, and tumor incorporation of BrdUrd was measured 1 and 3 days later.


RESULTS
Radiation affected neither the incorporation into nor the elimination of BrdUrd from human tumor xenografts.


CONCLUSIONS
These findings support the feasibility of clinical trials interdigitating BrdUrd infusion and radiation.
Lawrence
T S
TS
Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor 48109, USA.
Chang
E Y
EY
Davis
M A
MA
Stetson
P L
PL
Ensminger
W D
WD
D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism*; D002455:Cell Division / Q000502:physiology; D003110:Colonic Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000532:radiotherapy*; D004273:DNA, Neoplasm / Q000378:metabolism / Q000528:radiation effects; D004307:Dose-Response Relationship, Radiation; D005260:Female; D006801:Humans; D008297:Male; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D014183:Transplantation, Heterologous; D014407:Tumor Cells, Cultured / Q000528:radiation effects
D004273:DNA, Neoplasm; D001973:Bromodeoxyuridine