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The significance of fractionation regimens in radiation and combined hyperthermia using a murine fibrosarcoma
Author(s) -
Hahn Eric W.,
Alfieri Alan A.,
Kim Jae Ho
Publication year - 1978
Publication title -
cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.052
H-Index - 304
eISSN - 1097-0142
pISSN - 0008-543X
DOI - 10.1002/1097-0142(197812)42:6<2596::aid-cncr2820420613>3.0.co;2-i
Subject(s) - medicine , fibrosarcoma , hyperthermia , fractionation , radiation therapy , dose fractionation , oncology , radiation tolerance , cancer research , pathology , chromatography , chemistry
The significance of time‐dose relationships in the use of local tumor hyperthermia (LTH) when combined with radiation (RAD) was studied in a murine fibrosarcoma. RAD, either alone or combined with LTH, was delivered in four equal fractions (total doses, 1.8 to 4.2 krad) separated by 1 to 4 days. LTH (43.1 C ± .05 C for 15 minutes, water bath) was applied immediately after RAD. In this tumor system, RAD was most effective when delivered every 2nd or 3rd day, by a factor of 1.25 over the response achieved when the four fractions were delivered every 1 or 4 days. At all levels studied, RAD + LTH produced a superior tumor response compared to RAD alone. The ratio of the RAD + LTH/RAD doses to achieve an isobiological response ranged from 1.7 to 2.5. Most significant was the finding that the RAD + LTH treatment response was independent of the fractionation scheme used and more dependent on the total RAD dose delivered. Cancer 42:2596–2599, 1978.