Abstract
5073 Background: Prior analyses have shown that men who present with high volume (HV) disease and de novo metastases have shorter OS compared with other mHSPC subgroups. The objective of this analysis was to determine the prognostic relationship between a-priori defined 4-prognostic groups and OS in men with mHSPC and in a subset of trials in patients treated with androgen deprivation therapy (ADT) +docetaxel. This hypothesis was investigated by the STOPCAP M1 collaborators. Methods: We obtained individual patient data (IPD) from 13 randomized trials comparing treatment regimens (ADT or ADT + docetaxel in the control or research arms) in mHSPC. OS was defined as the time between date of randomization and date of death/or last follow-up. Patients (pts) were classified into 4 mutually exclusive groups. Poor prognostic risk-group was defined as HV (presence of visceral metastases, and/or > 4 bone metastases or presence of bone metastases beyond pelvic or vertebral bones) plus synchronous diagnosis (SYN); whereas intermediate risk groups were patients with HV and metachronous (MET; intermediate A) or low volume plus SYN (intermediate B); and lastly good risk group had LV plus MET. The proportional hazards model was used to estimate the hazard ratio (HR) and assess the prognostic significance of risk groups in predicting OS adjusting for treatment. Results: Of 6041 pts included in this analysis, 60% (3622 pts) had died. Median follow-up time=5-years. Overall 11%, 8%, 47% and 34% were in the good, intermediate A, intermediate B and poor risk groups, respectively and for trials including docetaxel (n=2627 pts) 9%, 5%, 39% and 47% respectively. HRs for risk groups are shown in the table. Conclusions: Differences in OS across the risk groups were observed. Further work is needed to investigate if more precise prognostic groups can be defined such as better characterization of patients' groupings of extent of bone metastases and visceral metastases. Clinical trial information: NCT00309985 ; NCT00268476 ; NCT00104715 ; NCT00079001 ; NCT00002651 ; NCT00685646 . [Table: see text]
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