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The effect of the overall treatment time of fractionated irradiation on the tumor control probability of a human soft tissue sarcoma xenograft in nude mice

Abstract

Purpose: To study the impact of the overall treatment time of fractionated irradiation on the tumor control probability (TCP) of a human soft tissue sarcoma xenograft growing in nude mice, as well as to compare the pretreatment potential doubling time (T{sub pot}) of this tumor to the effective doubling time (T{sub eff}) derived from three different schedules of irradiation using the same total number of fractions with different overall treatment times. Methods and Materials: The TCP was assessed using the TCD{sub 50} value (the 50% tumor control dose) as an end point. A total of 240 male nude mice, 7-8 weeks old were used in three experimental groups that received the same total number of fractions (30 fractions) with different overall treatment times. In group 1, the animals received three equal fractions/day for 10 consecutive days, in group 2 they received two equal fractions/day for 15 consecutive days, and in group 3 one fraction/day for 30 consecutive days. All irradiations were given under normal blood flow conditions to air breathing animals. The mean tumor diameter at the start of irradiation was 7-8 mm. The mean interfraction intervals were from 8-24 h. The T{sub pot} was measured using Iododeoxyuridine (IudR) labeling  More>>
Publication Date:
Apr 30, 1995
Product Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Radiation Oncology, Biology and Physics; Journal Volume: 32; Journal Issue: 1; Other Information: Copyright (c) 1995 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); PBD: 30 Apr 1995
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRONMENTAL POLLUTANT EFFECTS ON LIVING ORGANISMS AND BIOLOGICAL MATERIALS; ANIMAL TISSUES; BIOLOGICAL RADIATION EFFECTS; FRACTIONATED IRRADIATION; GRAFTS; MICE; RADIOTHERAPY; SARCOMAS; TIME DEPENDENCE
OSTI ID:
20391099
Country of Origin:
United States
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0360-3016; IOBPD3; TRN: US03R1521057446
Submitting Site:
INIS
Size:
page(s) 105-111
Announcement Date:

Citation Formats

Allam, Ayman, Perez, Luis A, Huang, Peigen, Taghian, Alphonse, Azinovic, Ignacio, Freeman, Jill, Duffy, Michael, Efird, Jimmy, and Suit, Herman D. The effect of the overall treatment time of fractionated irradiation on the tumor control probability of a human soft tissue sarcoma xenograft in nude mice. United States: N. p., 1995. Web. doi:10.1016/0360-3016(95)00511-V.
Allam, Ayman, Perez, Luis A, Huang, Peigen, Taghian, Alphonse, Azinovic, Ignacio, Freeman, Jill, Duffy, Michael, Efird, Jimmy, & Suit, Herman D. The effect of the overall treatment time of fractionated irradiation on the tumor control probability of a human soft tissue sarcoma xenograft in nude mice. United States. doi:10.1016/0360-3016(95)00511-V.
Allam, Ayman, Perez, Luis A, Huang, Peigen, Taghian, Alphonse, Azinovic, Ignacio, Freeman, Jill, Duffy, Michael, Efird, Jimmy, and Suit, Herman D. 1995. "The effect of the overall treatment time of fractionated irradiation on the tumor control probability of a human soft tissue sarcoma xenograft in nude mice." United States. doi:10.1016/0360-3016(95)00511-V. https://www.osti.gov/servlets/purl/10.1016/0360-3016(95)00511-V.
@misc{etde_20391099,
title = {The effect of the overall treatment time of fractionated irradiation on the tumor control probability of a human soft tissue sarcoma xenograft in nude mice}
author = {Allam, Ayman, Perez, Luis A, Huang, Peigen, Taghian, Alphonse, Azinovic, Ignacio, Freeman, Jill, Duffy, Michael, Efird, Jimmy, and Suit, Herman D}
abstractNote = {Purpose: To study the impact of the overall treatment time of fractionated irradiation on the tumor control probability (TCP) of a human soft tissue sarcoma xenograft growing in nude mice, as well as to compare the pretreatment potential doubling time (T{sub pot}) of this tumor to the effective doubling time (T{sub eff}) derived from three different schedules of irradiation using the same total number of fractions with different overall treatment times. Methods and Materials: The TCP was assessed using the TCD{sub 50} value (the 50% tumor control dose) as an end point. A total of 240 male nude mice, 7-8 weeks old were used in three experimental groups that received the same total number of fractions (30 fractions) with different overall treatment times. In group 1, the animals received three equal fractions/day for 10 consecutive days, in group 2 they received two equal fractions/day for 15 consecutive days, and in group 3 one fraction/day for 30 consecutive days. All irradiations were given under normal blood flow conditions to air breathing animals. The mean tumor diameter at the start of irradiation was 7-8 mm. The mean interfraction intervals were from 8-24 h. The T{sub pot} was measured using Iododeoxyuridine (IudR) labeling and flow cytometry and was compared to T{sub eff}. Results: The TCD{sub 50} values of the three different treatment schedules were 58.8 Gy, 63.2 Gy, and 75.6 Gy for groups 1, 2, and 3, respectively. This difference in TCD{sub 50} values was significant (p < 0.05) between groups 1 and 2 (30 fractions/10 days and 30 fractions/15 days) vs. group 3 (30 fractions/30 days). The loss in TCP due to the prolongation of the overall treatment time from 10 days to 30 days was found to be 1.35-1.4 Gy/day. The pretreatment T{sub pot} (2.4 days) was longer than the calculated T{sub eff} in groups 2 and 3 (1.35 days). Conclusion: Our data show a significant loss in TCP with prolongation of the overall treatment time. This is most probably due to an accelerated repopulation of tumor clonogens. The pretreatment T{sub pot} of this tumor model does not reflect the actual doubling of the clonogens in a protracted regimen.}
doi = {10.1016/0360-3016(95)00511-V}
journal = {International Journal of Radiation Oncology, Biology and Physics}
issue = {1}
volume = {32}
journal type = {AC}
place = {United States}
year = {1995}
month = {Apr}
}