Abstract
Background
Radiotherapy (RT) is an established treatment for patients with primary and recurrent prostate cancer. Herein, the effects of definitive and salvage RT on the composition of lymphocyte subpopulations were investigated in patients with prostate cancer to study potential immune effects.
Patients and methods
A total of 33 prostate cancer patients were treated with definitive (n = 10) or salvage RT (n = 23) after biochemical relapse. The absolute number of lymphocytes and the distribution of lymphocyte subpopulations were analyzed by multiparameter flow cytometry before RT, at the end of RT, and in the follow-up period.
Results
Absolute lymphocyte counts decreased significantly after RT in both patient groups and a significant drop was observed in the percentage of B cells directly after RT from 10.1 ± 1.3 to 6.0 ± 0.7% in patients with definitive RT and from 9.2 ± 0.8 to 5.8 ± 0.7% in patients with salvage RT. In contrast, the percentages of T and natural killer (NK) cells remained unaltered directly after RT in both patient groups. However, 1 year after RT, the percentage of CD3+ T cells was significantly lower in patients with definitive and salvage RT. The percentage of regulatory T cells was slightly upregulated in primary prostate cancer patients after definitive RT, but not after salvage RT.
Conclusion
Definitive and salvage RT exert similar effects on the composition of lymphocyte subpopulations in prostate cancer patients. Total lymphocyte counts are lower in both patient groups compared to healthy controls and further decreased after RT. B cells are more sensitive to definitive and salvage RT than T and NK cells.
Zusammenfassung
Hintergrund
Die Strahlentherapie (RT) ist eine bewährte Behandlung bim primären und rezidivierten Prostatakarzinoms. In dieser Studie wurde der Einfluss einer definitiven und Salvage RT auf die Zusammensetzung der Lymphozytensubpopulationen verglichen, um potenzielle Immuneffekte einer RT zu analysieren.
Patienten und Methoden
In die Studie wurden 33 Prostatakarzinompatienten eingeschlossen. Mit definitiver RT wurden 10 Patienten mit primärem Prostatakarzinom behandelt; 23 Patienten erhielten eine Salvage-RT nach biochemischem Rezidiv. Die absoluten Lymphozytenzahlen sowie die der Subpopulationen wurden vor RT, am Ende der RT und während des Follow-ups mittels Durchflusszytometrie analysiert.
Ergebnisse
Die absoluten Lymphozytenzahlen gingen in beiden Gruppen signifikant zurück. Direkt nach RT zeigte sich ein signifikanter Abfall der B‑Lymphozyten von 10,1 ± 1,3 % auf 6,0 ± 0,7 % bei Patienten mit definitiver RT und von 9,2 ± 0,8 % auf 5,8 ± 0,7 % bei Patienten mit Salvage-RT. Im Gegensatz dazu blieb der Anteil von T‑ und natürlichen Killerzellen (NK-Zellen) direkt nach RT in beiden Gruppen unverändert. Ein Jahr nach definitiver und Salvage-RT zeigte sich jedoch ein signifikanter Abfall der CD3+-T-Zellen. Der Anteil regulatorischer T‑Zellen war bei Patienten mit primärem Prostatakarzinom nach definitiver RT leicht erhöht, nicht jedoch nach Salvage-RT.
Schlussfolgerung
Die Verteilung der Lymphozytensubpopulationen nach definitiver oder Salvage-RT unterscheidet sich nicht signifikant in den Patientengruppen. Beide Gruppen weisen im Vergleich zu gesunden Kontrollen erniedrigte Gesamtlymphozytenwerte auf, die nach RT noch weiter absinken. B‑Zellen verhalten sich gegenüber einer definitiven und Salvage-RT sensibler als T‑ und NK-Zellen.
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Acknowledgements
The authors thank Bernhard Haller for support with statistical analysis of the data.
Funding
This work was supported by EU-CELLEUROPE (315963); BMBF (Strahlenkompetenz, 02NUK038A; Innovative Therapies, 01GU0823; NSCLC, 16GW0030), German Cancer Consortium Radiation Oncology Group (DKTK-ROG); the DFG Cluster of Excellence: Munich Centre for Advanced Photonics (MAP); DFG SFB 824/2; INST 95/980-1 FUGG; INST 411/37-1 FUGG irradiation devices. Eva Sage was supported by the Medical Faculty of TUM as a fellow of the doctoral program “Translationale Medizin.” This work was supported by the German Research Foundation (DFG) and the Technische Universität München within the Open Access Publishing funding program.
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E.K. Sage, T.E. Schmid, H. Geinitz, M. Gehrmann, M. Sedelmayr, M.N. Duma, S.E. Combs, and G. Multhoff declare that they have no competing interests.
Caption Electronic Supplementary Material
66_2017_1144_MOESM1_ESM.docx
Supplementary table 1: List of all antibody combinations and chromophores which were used in the study. Antibody stainings which did not show any significant changes in the patient samples during the course of analysis were not shown in the results part.
66_2017_1144_MOESM2_ESM.jpg
Supplementary figure 1: Schematic representation of the gating procedure of the flow cytometry data. R1 lymphocyte gate, R2 granolocytes, R3 monocytes.
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Sage, E.K., Schmid, T.E., Geinitz, H. et al. Effects of definitive and salvage radiotherapy on the distribution of lymphocyte subpopulations in prostate cancer patients. Strahlenther Onkol 193, 648–655 (2017). https://doi.org/10.1007/s00066-017-1144-7
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DOI: https://doi.org/10.1007/s00066-017-1144-7