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Adjuvant radiotherapy after salvage lymph node dissection because of nodal relapse of prostate cancer versus salvage lymph node dissection only

Adjuvante Strahlentherapie nach Salvage-Lymphadenektomie beim nodalen Prostatakarzinomrezidiv im Vergleich zur alleinigen Salvage-Lymphadenektomie

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Abstract

Background

Nodal pelvic/retroperitoneal recurrent prostate cancer (PCa) after primary therapy can be treated with salvage lymph node dissection (salvage-LND) in order to delay disease progression and offer cure for a subset of patients. Whether adjuvant radiotherapy (ART) in affected regions improves the outcome by elimination of residual tumour burden remains unclear.

Methods

A total of 93 patients with exclusively nodal PCa relapse underwent choline-positron-emission tomography-computed-tomography-directed pelvic/retroperitoneal salvage-LND; 46 patients had surgery only and 47 patients received ART in regions with proven lymph node metastases. In case of subsequent prostate specific antigen (PSA) progression, different imaging modalities were performed to confirm next relapse within or outside the treated region (TR). Mean follow-up was 3.2 years.

Results

Lymphatic tumour burden was balanced between the two groups. Additional ART resulted in delayed relapse within TR (5-year relapse-free rate 70.7 %) versus surgery only (5-year relapse-free rate 26.3 %, p < 0.0001). In both treatment arms, time to next relapse outside the TR was almost equal (median 27 months versus 29.6 months, p = 0.359). With respect to the detection of the first new lesion, regardless if present within or outside the TR, 5 years after the treatment 34.3 % of patients in the group with additional ART were free of relapse, versus 15.4 % in the surgery only group (p = 0.0122). ART had no influence on the extent of PSA reduction at latest follow-up compared to treatment with surgery only.

Conclusion

ART after salvage-LND provides stable local control in TR and results in overall significant improved next-relapse-free survival, compared to patients who received surgery only in case of nodal PCa-relapse.

Zusammenfassung

Hintergrund

Das nodal positive Prostatakarzinom(PCa)-Rezidiv nach Primärtherapie kann durch eine Salvage-Lymphadenektomie (Salvage-LND) therapiert werden. Der Krankheitsprogress wird aufgehalten und selektionierte Patienten erhalten eine zweite Chance auf eine Kuration. Ob eine adjuvante Strahlentherapie (ART Eradikation von verbleibenden Tumorzellen in der betreffenden Region) die Tumorfreiheitsrate verbessert, ist ungeklärt.

Material und Methoden

Insgesamt 93 Patienten mit einem ausschließlich nodalen PCa-Rezidiv wurden nach Diagnostik mittels Cholin-Positronenemissionstomographie/Computertomographie einer Salvage-LND unterzogen; 46/93 Patienten wurden ausschließlich operiert, 47/93 Patienten erhielten zusätzlich eine ART. Im Fall einer PSA-(prostataspezifisches-Antigen)-Progression wurde durch bildgebende Verfahren das nächste Rezidiv innerhalb oder außerhalb der behandelten Region (TR) diagnostiziert. Der mittlere Beobachtungszeitraum lag bei 3,2 Jahren.

Ergebnisse

Die Anzahl der Lymphknotenmetastasen war in den zwei Gruppen gleichverteilt. Eine zusätzliche ART bewirkte ein verzögertes Auftreten von neuen Metastasen in der TR (metastasenfreies 5-Jahres-Überleben 70,7 %) im Vergleich zur alleinigen Salvage-LND (metastasenfreies 5-Jahres-Überleben 26,3 %; p < 0,0001). Der Zeitpunkt bis zur Diagnose von Metastasen außerhalb der TR war in beiden Behandlungsarmen nicht signifikant unterschiedlich (27 Monate versus 29,6 Monate; p = 0,359). Unabhängig von der Lokalisation der neuen Metastasen lag das metastasenfreie 5-Jahres-Überleben bei Patienten mit einer Kombinationstherapie bei 34,3 %, bei Patienten mit alleiniger Operation hingegen bei 15,4 % (p = 0,0122). Die zusätzliche Strahlentherapie verursachte, verglichen mit einer alleinigen Operation, keinen signifikanten Unterschied bezüglich der PSA-Wert-Reduktion am Ende des Beobachtungszeitraums.

Schlussfolgerung

Eine zusätzliche ART bewirkt eine stabile lokale Tumorkontrolle in der behandelten Region und resultiert in einem signifikant verlängerten metastasenfreien Überleben verglichen mit einer alleinigen Salvage-LND beim nodalen Prostatakarzinomrezidiv.

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Abbreviations

ART:

Adjuvant radiotherapy

AHT:

Antihormonal therapy

CI:

Confidence interval

CT:

Computed tomography

CTV:

Clinical target volume

IGRT:

Image-guided radiotherapy

IMRT:

Intensity-modulated radiotherapy

LN:

Lymph nodes

LNM:

Lymph node metastases

MRI:

Magnetic resonance imaging

PET/CT:

Positron emission tomography/computed tomography

PCa:

Prostate cancer

PSA:

Prostate-specific antigen

PTV:

Planning target volume

Salvage-LND:

Salvage lymph node dissection

SD:

Standard deviation

Sup:

Supplement

TR:

Treated region

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Conflict of interest

H.C. Rischke, W. Schultze-Seemann, G. Wieser, M. Krönig, V. Drendel, P. Stegmaier, T. Krauss, K. Henne, N. Volegova-Neher, D. Schlager, S. Kirste, A.-L. Grosu, and C.A. Jilg 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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Correspondence to Cordula Annette Jilg.

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Rischke, H., Schultze-Seemann, W., Wieser, G. et al. Adjuvant radiotherapy after salvage lymph node dissection because of nodal relapse of prostate cancer versus salvage lymph node dissection only. Strahlenther Onkol 191, 310–320 (2015). https://doi.org/10.1007/s00066-014-0763-5

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