Interaction of heat with radiation and chemotherapy

In using hyperthermia in the clinic, thermal dosimetry is essential and is discussed in terms of equating time-temperature relationships for an isoeffect to an equivalent time at a reference temperature, 43 degrees for example. In applying time-temperature-equivalence, the sequence between heat and...

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Bibliographic Details
Published in:Cancer research (Chicago, Ill.) Ill.), 1984-10, Vol.44 (10 Suppl), p.4714s-4720s
Main Author: Dewey, W C
Format: Article
Language:English
Subjects:
Animals
Cell Division - drug effects
Cell Line
Combined Modality Therapy
Hot Temperature - adverse effects
Humans
Hyperthermia, Induced
Neoplasms - drug therapy
Neoplasms - radiotherapy
Neoplasms - therapy
Polyamines - metabolism
Space life sciences
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Summary:In using hyperthermia in the clinic, thermal dosimetry is essential and is discussed in terms of equating time-temperature relationships for an isoeffect to an equivalent time at a reference temperature, 43 degrees for example. In applying time-temperature-equivalence, the sequence between heat and radiation and between two heat treatments, radiation dose rate, linear energy transfer, and physiological parameters must be considered. Furthermore, thermal tolerance observed for both heat killing and heat radiosensitization, especially for doses of 400 rads or greater, may be considered as a thermal dose modifier. When hyperthermia is combined with drugs, most of the factors mentioned above are probably important and need careful evaluation, including the applicability of calculating equivalent time at a reference temperature. Examples are given for delayed heat sensitization after depletion of intracellular polyamines and for heat partially overcoming resistance to 1,3-bis-2-chloroethylnitrosourea in order to illustrate the importance of understanding heat effects on formation of reactive drug intermediates, permeability of drugs into cells, and damage to target molecules.
ISSN:0008-5472