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Poster display session: Breast cancer - early stage, locally advanced & metastatic, CNS tumours, Developmental therapeutics, Genitourinary tumours - prostate & non-prostate, Palliative care, Psycho-oncology, Public health policy, Sarcoma, Supportive care

4873 - Abiraterone acetate plus prednisone and LHRH therapy versus abiraterone acetate plus prednisone while sparing LHRH therapy in patients with progressive, metastatic and chemotherapy-naïve, castration-resistant prostate cancer: results from the SPARE-trial (NCT02077634)

Date

22 Oct 2018

Session

Poster display session: Breast cancer - early stage, locally advanced & metastatic, CNS tumours, Developmental therapeutics, Genitourinary tumours - prostate & non-prostate, Palliative care, Psycho-oncology, Public health policy, Sarcoma, Supportive care

Topics

Cytotoxic Therapy

Tumour Site

Prostate Cancer

Presenters

Carsten Ohlmann

Citation

Annals of Oncology (2018) 29 (suppl_8): viii271-viii302. 10.1093/annonc/mdy284

Authors

C. Ohlmann¹, Z. Roger², C. Rüssel³, E. Hellmis⁴, H. Suttmann⁵, M. Janssen⁶, A. Hübner⁷, J. Dahm⁸, J. Gleißner⁹, M. Scheffler¹⁰, S. Feyerabend¹¹, J. Telle¹², J. Klier¹³

Author affiliations

¹ Urology, Malteser Krankenhaus Bonn, 53123 - Bonn/DE
² Urology, Praxis für Urologie Pankow, Berlin/DE
³ Urology, Praxisgemeinschaft für Urologie, Borken/DE
⁴ Urology, Urologikum Duisburg, Duisburg/DE
⁵ Urology, Urologikum Hamburg, Hamburg/DE
⁶ Urology, Saarland University Medical Center, Hamburg/DE
⁷ Urology, WK Nord GmbH & Co. KG, Rostock/DE
⁸ Urology, PandaMED - ÜBAG, Wuppertal/DE
⁹ Urology, DGU Wuppertal, Wuppertal/DE
¹⁰ Urology, Gemeinschaftspraxis für Urologie, Zwickau/DE
¹¹ Urologic Oncology, Studienpraxis Urologie, Nürtingen/DE
¹² Urology, Urologische Praxis Würzburg, Würzburg/DE
¹³ Urology, Praxis, Köln/DE

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Abstract 4873

Background

The value of continuation of luteinizing hormone-releasing hormone (LHRH) therapy in castration-resistant prostate cancer (CRPC) remains controversial and clear evidence is lacking. Especially upon treatment with the life-prolonging cytochrome P450 17-alpha-hydroxylase/C_17,20 lyase (Cyp17)-inhibitor, abiraterone, which in combination with prednisone, has the ability to further suppress testosterone serum levels over LHRH therapy alone, continuation of LHRH therapy seems to be negligible. The aim of the SPARE trial therefore was to explore the role of continuation of LHRH therapy when starting treatment with abiraterone acetate plus prednisone (AA+P) in patients with asymptomatic or mildly symptomatic, chemotherapy-naïve CPRC.

Methods

Patients were randomized to receive continuing LHRH therapy versus LHRH withdrawal at the time of starting abiraterone AA+P therapy (NCT02077634). The primary endpoint was rate of rPFS at month 12. Secondary endpoints included PSA response rate, objective response, time to PSA progression and safety.

Results

Altogether, 68 patients were randomized. Median age was 75 (60-86) years with a median PSA at baseline of 23.9 (0.17-1680) ng/ml. Results of the secondary endpoints were evaluated.Table: 810P

	LHRH+AA+P	AA+P	HR (p-value)
Patients (n)	34	33
Median age (range)	74 (60-86) years	76 (60-86) years
Median baseline PSA (range)	31.9 (0.17-313.2) ng/ml	20.59 (1.97-1680) ng/ml
PSA-decline ≥50%	23/34 (67.6%)	24/33 (72.7%)
Median treatment duration (d)	266	420	1.667 (0.197)*
Time to PSA progression (d)	288	336	1.733 (0.188)*

*

study was not powered for these endpoints.

Conclusions

The results of the exploratory study show that AA + P without continuation of LHRH therapy leads to considerable PSA response rates and longer time to PSA progression. The currently assessed efficacy is comparable to the results of the COU-AA-302 trial, hypothesising that continuation of LHRH therapy may not be necessary upon treatment with AA + P. Results on the primary endpoint and the safety profile are pending and are currently being evaluated.

Clinical trial identification

NCT02077634.

Legal entity responsible for the study

Saarland University.

Funding

Janssen-Cilag.

Editorial Acknowledgement

Disclosure

C. Ohlmann: Research funding: Janssen-Cilag. All other authors have declared no conflicts of interest.