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Influence of time interval between surgery and radiotherapy on tumor regrowth.

Abstract：

UNLABELLED:In order to evaluate the influence of time intervals between tumor cell injection and radiotherapy on tumor control and regrowth after surgery, we performed two kinds of experiments on C3D2F1 mice bearing a mammary carcinoma inoculated in the foot or leg. 1st experiment: tumor in foot. END POINT:Tumor Control Probability (TCP). Single dose radiation treatments (RT) were administered at different period times from injection time of tumor cells (day 1). 1st group: unirradiated control, 2nd group: RT on day 2 (TCP50 29 +/- 2.1 Gy), 3rd group: RT on day 7 (TCP 52.5 +/- 2.9 Gy), 4th group: RT on day 12 (TCP50 61.9 + 2.4 Gy). 2nd experiment: tumor in leg. END POINT:percentage of tumor regrowth. Mice were randomly assigned to three groups: 1st control group (tumor growth in all mice), 2nd surgical excision of macroscopically evident tumor on day 7-9 from injection (tumor regrowth in 85% of mice), 3rd as the previous group plus 30 Gy radiation treatment within 24 hours from excision (tumor regrowth in 33% of cases). The radiation dose was selected on the basis of TCP50 observed in the 1st experiment for mice with sub-clinical disease. These data indicate that the radiation dose able to control 50% of tumors increases with the time interval between tumor cells injection and RT. A short time interval between surgery and RT should increase the probability of local control, supporting the rationale of intraoperative radiation therapy (IORT) as adjuvant therapy after surgical resection, when subclinical residual cells are suspected.

journal_name

J Exp Clin Cancer Res

journal_title

Journal of experimental & clinical cancer research : CR

authors

Cividalli A,Creton G,Ceciarelli F,Strigari L,Tirindelli Danesi D,Benassi M

keywords:

subject

Has Abstract

pub_date

2005-03-01 00:00:00

pages

109-16

issue

1

eissn

0392-9078

issn

1756-9966

journal_volume

24

pub_type

杂志文章

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