Impact of baseline serum IL-8 on metastatic hormone-sensitive prostate cancer outcomes in the Phase 3 CHAARTED trial (E3805)

© 2020 Wiley Periodicals LLC..

BACKGROUND: The immunosuppressive cytokine interleukin- 8 (IL-8), produced by tumor cells and some myeloid cells, promotes inflammation, angiogenesis, and metastasis. In our discovery work, elevated serum IL-8 at androgen deprivation therapy (ADT) initiation portended worse overall survival (OS). Leveraging serum samples from the phase 3 CHAARTED trial of patients treated with ADT +/- docetaxel for metastatic hormone-sensitive prostate cancer (mHSPC), we validated these findings.

METHODS: Two hundred and thirty-three patients had serum samples drawn within 28 days of ADT initiation. The samples were assayed using the same Mesoscale Multiplex ELISA platform employed in the discovery cohort. After adjusting for performance status, disease volume, and de novo/metachronous metastases, multivariable Cox proportional hazards models assessed associations between IL-8 as continuous and binary variables on OS and time to castration-resistant prostate cancer (CRPC). The median IL-8 level (9.3 pg/ml) was the a priori binary cutpoint. Fixed-effects meta-analyses of the discovery and validation sets were performed.

RESULTS: Higher IL-8 levels were prognostic for shorter OS (continuous: hazard ratio [HR] 2.2, 95% confidence interval [CI]: 1.4-3.6, p = .001; binary >9.3: HR 1.7, 95% CI: 1.2-2.4, p = .007) and time to CRPC (continuous: HR 2.3, 95% CI: 1.6-3.3, p < .001; binary: HR 1.8, 95% CI: 1.3-2.5, p < .001) and independent of docetaxel use, disease burden, and time of metastases. Meta-analysis including the discovery cohort, also showed that binary IL-8 levels >9.3 pg/ml from patients treated with ADT alone was prognostic for poorer OS (HR 1.8, 95% CI: 1.2-2.7, p = .007) and shorter time to CRPC (HR 1.4, 95% CI: 0.99-1.9, p = .057).

CONCLUSIONS: In the phase 3 CHAARTED study of men with mHSPC at ADT initiation, elevated IL-8 portended worse survival and shorter time to castration-resistant prostate cancer independent of docetaxel administration, metastatic burden, and metachronous versus de novo metastatic presentation. These findings support targeting IL-8 as a strategy to improve mHSPC outcomes.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:80

Enthalten in:

The Prostate - 80(2020), 16 vom: 04. Dez., Seite 1429-1437

Sprache:

Englisch

Beteiligte Personen:

Harshman, Lauren C [VerfasserIn]
Wang, Victoria X [VerfasserIn]
Hamid, Anis A [VerfasserIn]
Santone, Gabriella [VerfasserIn]
Drake, Charles G [VerfasserIn]
Carducci, Michael A [VerfasserIn]
DiPaola, Robert S [VerfasserIn]
Fichorova, Raina N [VerfasserIn]
Sweeney, Christopher J [VerfasserIn]

Links:

Volltext

Themen:

15H5577CQD
ADT
Androgen Antagonists
Antineoplastic Agents
Cytokines
Docetaxel
Hormone sensitive prostate cancer
IL-8
Interleukin-8
Journal Article
MCP
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
TNF-α

Anmerkungen:

Date Completed 26.01.2021

Date Revised 28.01.2022

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1002/pros.24074

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM315205601