Trial Outcomes & Findings for XRP6258 Plus Prednisone Compared to Mitoxantrone Plus Prednisone in Hormone Refractory Metastatic Prostate Cancer (NCT NCT00417079)

Multicenter study: 146 actives sites from 26 countries in Europe, USA, South America and Asia Pacific region. Study initiation date: January 2nd, 2007; study completion date/study cut off date: September 25th, 2009.

165 patients signed informed consent but were not randomized and considered as screen failure. Intention to Treat Population (ITT or randomized patients): 755 patients (377 mitoxantrone, 378 cabazitaxel). Safety population (treated patients): 742 patients (371 mitoxantrone, 371 cabazitaxel) (Patients not treated: 6 mitoxantrone, 7 cabazitaxel).

XRP6258 Plus Prednisone Compared to Mitoxantrone Plus Prednisone in Hormone Refractory Metastatic Prostate Cancer

Overall survival was defined as the time interval from the date of randomization to the date of death due to any cause. In the absence of confirmation of death, the survival time was censored at the last date patient was known to be alive or at the cut-off date, whichever had come first.

Progression free survival was defined as a composite endpoint evaluated from the date of randomization to the date of tumor progression, PSA progression, pain progression, or death due to any cause, whichever occurred first

Tumor Overall Response Rate (ORR) (only in patients with measurable disease): Objective responses (Complete Response and Partial Response) for measurable disease as assessed by investigators according to RECIST criteria. Complete Response (CR) is defined as: Disappearance of all target lesions. Partial Response (PR) is defined as: At least a 30% decrease in the sum of longest diameter (LD) of target lesions taking as reference baseline sum LD. Confirmation of objective responses will be performed by repeat tumor imaging (CT scans, MRI, bone scans) after the first documentation of response.

Time to tumor progression is defined as the number of months from randomization until evidence of progressive disease (RECIST)

In PSA non-responders, progression will be defined as a 25% increase over nadir and increase in the absolute value PSA level by at least 5 ng/ml and confirmed by a second value at least 4 weeks later. In PSA responders and in patients not evaluable for PSA response at baseline, progression will be defined as a ≥50% increase over nadir, provided that the increase is a minimum of 5 ng/ml and confirmed by a second value at least 1 week later.

PSA response was defined as a ≥ 50% reduction in serum PSA, determined only for patients with a serum PSA ≥ 20ng/mL at baseline, confirmed by a repeat PSA ≥ 3 weeks later.

Pain Progression is defined as an increase of ≥1 point in the median Personal Pain Intensity (PPI) from its nadir noted on 2 consecutive 3-week-apart visits or ≥25 % increase in the mean analgesic score compared with the baseline score \& noted on 2 consecutive 3-week-apart visits or requirement for local palliative radiotherapy. Evaluation of the PPI \& analgesic scores are based on the short-form McGill Pain Questionnaire which consists of 15 descriptors (11 sensory; 4 affective) which are rated on an intensity scale as 0=none (best) 1=mild 2=moderate 3=severe (worst) (TOTAL: 0=best 45=worst)

Pain Response was defined as a two-point or greater reduction from baseline median Present Pain Intensity (PPI) score without an increased Analgesic Score (AS) or a decrease of ≥50% in the AS without an increase in the PPI score, maintained for at least 3 weeks.