Apalutamide plus androgen deprivation therapy in clinical subgroups of patients with metastatic castration-sensitive prostate cancer: A subgroup analysis of the randomised clinical TITAN study

Axel S. Merseburger*, Neeraj Agarwal, Amitabha Bhaumik, Florence Lefresne, Laurence I. Karsh, Andrea J. Pereira de Santana Gomes, Álvaro Juárez Soto, Robert W. Given, Sabine D. Brookman-May, Suneel D. Mundle, Sharon A. McCarthy, Hirotsugu Uemura, Simon Chowdhury, Kim N. Chi, Anders Bjartell

*Corresponding author for this work

Abstract

Background: Whether disease burden in patients with metastatic castration-sensitive prostate cancer (mCSPC) predicts treatment outcomes is unknown. We assessed apalutamide treatment effect in TITAN patients with mCSPC by disease volume, metastasis number and timing of metastasis presentation. Methods: These protocol-defined and post hoc analyses of the phase III randomised TITAN study evaluated clinical outcomes in patients receiving 240 mg/day apalutamide (n = 525) or placebo (n = 527) plus androgen-deprivation therapy (ADT). Subgroups were defined by volume (high: visceral and ≥1 bone metastases or ≥4 bone lesions with ≥1 beyond vertebral column/pelvis), development of metastases per conventional imaging (synchronous: at initial diagnosis; metachronous: after localised disease) and oligometastases (≤5 bone-only metastases) or polymetastases (>5 in bone ± other locations or ≤5 in bone plus other locations). Overall survival (OS), radiographic or second progression-free survival, and time to prostate-specific antigen progression or castration resistance were assessed using Cox proportional hazards models. Results: Of 1052 patients, 63%, 81%, 54%, 27%, 5.7%, and 8.0% had high-volume, synchronous, synchronous/high-volume, synchronous/low-volume, metachronous/high-volume, and metachronous/low-volume disease, respectively. The OS benefit favoured apalutamide plus ADT versus ADT alone in synchronous/high-volume (hazard ratio = 0.68 [95% confidence interval: 0.53–0.87]; p = 0.002), synchronous/low-volume (0.65 [0.40–1.05]; p = 0.08), metachronous/high-volume (0.69 [0.33–1.44]; p = 0.32) and metachronous/low-volume (0.22 [0.09–0.55]; p = 0.001) subgroups. Apalutamide improved other clinical outcomes regardless of subgroup, with similar safety profiles. Most favourable outcomes were observed in oligometastatic disease. Conclusion: TITAN patients derived a robust benefit with apalutamide plus ADT regardless of disease volume and timing of metastasis presentation without differences in safety, supporting early apalutamide intensification in mCSPC. Clinical Trial Registration: NCT02489318.

Original languageEnglish
Article number113290
JournalEuropean Journal of Cancer
Volume193
Pages (from-to)113290
ISSN0959-8049
DOIs
Publication statusPublished - 11.2023

Research Areas and Centers

  • Research Area: Luebeck Integrated Oncology Network (LION)
  • Centers: University Cancer Center Schleswig-Holstein (UCCSH)

DFG Research Classification Scheme

  • 205-14 Haematology, Oncology
  • 205-23 Reproductive Medicine, Urology

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