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Early hematologic changes during prostate cancer radiotherapy predictive for late urinary and bowel toxicity

Frühe hämatologische Veränderungen während der Radiotherapie beim Prostatakarzinom prädiktiv für späte Miktions- und Darmbeschwerden

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Abstract

Background

The primary objective of the study was to identify early hematologic changes predictive for radiotherapy (RT)-associated genitourinary and gastrointestinal toxicity.

Methods

In a group of 91 prostate cancer patients presenting for primary (n = 51) or postoperative (n = 40) curative RT, blood samples (blood count, acute phase proteins, and cytokines) were analyzed before (T1), three times during (T2–T4), and 6–8 weeks after (T5) radiotherapy. Before RT (baseline), on the last day (acute toxicity), a median of 2 months and 16 months (late toxicity) after RT, patients responded to a validated questionnaire (Expanded Prostate Cancer Index Composite). Acute score changes > 20 points and late changes > 10 points were considered clinically relevant.

Results

Radiotherapy resulted in significant changes of hematologic parameters, with the largest effect on lymphocytes (mean decrease of 31–45 %) and significant dependence on target volume. C-reactive protein (CRP) elevation > 5 mg/l and hemoglobin level decrease ≥ 5 G/1 at T2 were found to be independently predictive for acute urinary toxicity (p < 0.01, respectively). CRP elevation was predominantly detected in primary prostate RT (p = 0.02). Early lymphocyte level elevation ≥ 0.3G/l at T2 was protective against late urinary and bowel toxicity (p = 0.02, respectively). Other significant predictive factors for late bowel toxicity were decreasing hemoglobin levels (cut-off ≥ 5 G/l) at T2 (p = 0.04); changes of TNF-α (tumor necrosis factor; p = 0.03) and ferritin levels (p = 0.02) at T5. All patients with late bowel toxicity had interleukin (IL)-6 levels < 1.5 ng/l at T2 (63 % without; p = 0.01).

Conclusion

Early hematologic changes during prostate cancer radiotherapy are predictive for late urinary and bowel toxicity.

Zusammenfassung

Hintergrund

Das primäre Ziel der Studie war die Identifikation von frühen hämatologischen Veränderungen mit prädiktiver Bedeutung für radiotherapieassoziierte genitourinale und gastrointestinale Toxizität.

Methoden

In einer Gruppe von 91 Patienten mit einem Prostatakarzinom, die sich zur primären (n = 51) oder postoperativen (n = 40) Radiotherapie (RT) vorgestellt haben, wurden Blutproben (Blutbild, Akute-Phase-Proteine und Zytokine) vor (T1), dreimal während (T2–T4) und 6–8 Wochen nach RT (T5) untersucht. Vor RT (Ausgangsbefund), am letzten Tag (akute Toxizität), median 2 Monate und 16 Monate (Spättoxizität) nach RT haben die Patienten einen validierten Fragebogen beantwortet (Expanded Prostate Cancer Index Composite). Akute Scoreänderungen > 20 Punkte und späte Änderungen > 10 Punkte wurden als klinisch relevant bewertet.

Ergebnisse

Die Radiotherapie führte zu signifikanten Veränderungen der hämatologischen Parameter, mit dem größten Effekt auf Lymphozyten (mittlerer Abfall von 31–45 %) und signifikanter Abhängigkeit vom Zielvolumen. Eine Erhöhung des C-reaktiven Proteins (CRP) auf > 5 mg/l und ein Hämoglobinabfall ≥ 5 G/l zum Zeitpunkt T2 waren unabhängig prädiktiv für akute Miktionsbeschwerden (jeweils p < 0,01). Eine CRP-Erhöhung fand sich vorwiegend bei primärer RT der Prostata (p = 0,02). Ein früher Lymphozytenanstieg ≥ 0,3G/l bei T2 war protektiv gegen späte Miktions- und Darmbeschwerden (jeweils p = 0,02). Weitere signifikante prädiktive Faktoren für späte Darmbeschwerden waren abfallende Hämoglobinwerte (Grenzwert ≥ 5 G/l) bei T2 (p = 0,04); Veränderungen der TNFα- (Tumornekrosefaktor; p = 0,03) und Ferritinspiegel (p = 0,02) bei T5. Alle Patienten mit späten Darmbeschwerden hatten Interleukin-(IL-)6-Werte < 1,5 ng/l bei T2 (vs. 63 % ohne Darmbeschwerden; p = 0,01).

Schlussfolgerung

Frühe hämatologische Veränderungen während der Radiotherapie beim Prostatakarzinom sind prädiktiv für späte Miktions- und Darmbeschwerden.

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Acknowledgments

This work was supported by Philips Research, Aachen, Germany

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Correspondence to Michael Pinkawa.

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Conflict of interest

M. Pinkawa, C. Ribbing, V. Djukic, J. Klotz, R. Holy, and M.J. Eble state that there are no conflicts of interest.

All studies on humans described in the present manuscript were carried out with the approval of the responsible ethics committee and in accordance with national law and the Helsinki Declaration of 1975 (in its current, revised form). Informed consent was obtained from all patients included in studies.

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Pinkawa, M., Ribbing, C., Djukic, V. et al. Early hematologic changes during prostate cancer radiotherapy predictive for late urinary and bowel toxicity. Strahlenther Onkol 191, 771–777 (2015). https://doi.org/10.1007/s00066-015-0841-3

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  • DOI: https://doi.org/10.1007/s00066-015-0841-3

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