COMPLICATIONS OF TREATMENTRadiation recall: A well recognized but neglected phenomenon
Introduction
Radiation recall is characterized by an inflammatory reaction within a previously irradiated volume after administration of certain promoting agents, such as antineoplastic drugs. It was first described with the antitumour antibiotic actinomycin D1, 2 but it has been observed with other classes of chemotherapy agents, including anthracyclines,3, 4, 5, 6, 7 alkylating agents,8 antimetabolites,9, 10, 11, 12 nucleoside analog,13, 14, 15 and taxanes.16, 17, 18, 19, 20, 21, 22, 23, 24 Nowadays other different classes of pharmacologic agents have also been involved in this inflammatory reaction as antituberculosis drugs and antibiotics,25, 26 tamoxifen,27, 28 simvastatin29, 30 and exposure to ultraviolet light31, 32 can also induce it.
Although skin has been the major site of radiation recall toxicity,33 instances involving lung,23, 34, 35 esophagus,36 small intestine,37, 38 muscle,14, 15, 39, 40 central nervous system,15 and head and neck have also been reported.41, 42
This phenomenon is well known but poorly understood. In this review article, all etiological hypotheses on this phenomenon are critically discussed, and available radiobiological evidence is presented. All prior publications regarding radiation recall dermatitis and recall in other sites are reviewed. In addition, we develop herein all radiation parameters, grading score, drug characteristics, and time intervals characterizing this phenomenon.
Section snippets
Biological basis
Augmentation of radiation effects on normal and neoplastic tissues by the administration of chemotherapeutic agents has been extensively studied. The increased therapeutic benefit from synergistic effects of radiation and chemotherapy is being exploited in concurrent or sequential administration of the antineoplastic drugs and radiation in many tumour systems.
One special class of the normal tissue reaction from combined radiation and chemotherapy is designated “radiation recall” when it is
Review of the literature
Data for this review were identified by searches of Medline and Cancerlit. End of literature search was December 2004. The search terms “radiation”, “recall”, and “toxicity” were used. References identified from within retrieved articles were also used. There was no limitation on year of publication and no abstract forms were included. Only articles published in English were taken into consideration.
Radiation recall reaction may involve almost every organ system including skin, mucous membranes
Radiation parameters
The associated radiation doses ranged from 10 to 81 Gy. No absolute radiation dose threshold is clear, but it is interesting to note that in the clinical case reported by Yeo et al.,16 the skin reaction occurred in only two of four regions of irradiated skin, i.e., where the skin doses were the highest (from 18.7 to 21.5 Gy). This is reflected in either the recall phenomenon disappearing or at least diminishing with dose reduction; however, the radiation dose required to elicit recall has yet to
Conclusion
Radiation recall phenomenon is a well-known phenomenon without radiation- and drug-specific characteristics, even if adriamycin and taxanes seem to be more associated with this reaction. The etiology appears to involve local drug hypersensitivity through the inflammatory cascade stimulation in a cellular sensitivity area. Further experimental data need to confirm this hypothesis. We propose to collect data on all future cases of radiation recall phenomenon in a Rare Cancer Network®
Acknowledgments
The authors thank Ms. F. Godson for her excellent editorial assistance.
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