A Phase 2 Study With Enzastaurin Plus Chemotherapy or Placebo Plus Chemotherapy for Prostate Cancer Patients

Response using Response Evaluation Criteria In Solid Tumors (RECIST). Complete Response (CR)=disappearance of all target lesions; Partial Response (PR)=30% decrease in sum of longest diameter of target lesions; Progressive Disease (PD)=20% increase in sum of longest diameter of target lesions; Stable Disease (SD)=small changes that do not meet above criteria. Objective response rate (%)=number of objective responders divided by the number of participants qualified for efficacy analysis \*100, where objective responders are those participants who have met criteria either for CR or PR.

Time frame: Baseline up to 3 years

Population: All enrolled participants from Part 2 group, who received at least one dose of study drug. Per protocol, Part 1 was not included as it is an open-label safety lead-in portion with PK characterization.

A listing of serious AEs (SAEs) and all other non-serious AEs is included in the Reported Adverse Event Module.

Time frame: Baseline through 3 years

Population: The analysis population was defined as all enrolled participants who received at least one dose of study drug.

Duration of response is defined as the time from date of objective response to progressive disease (PD) or death or prostate-specific androgen (PSA) returning to at least 50% from original baseline value.

Time frame: First objective response to PD/death/PSA returning to 50% or more than the original baseline value (up to 616 days)

Population: All enrolled participants from Part 2 group, who received at least one dose of study drug. Per protocol, Part 1 was not included as it is an open-label safety lead-in portion with PK characterization.

Overall survival (OS) time is defined as the time from the date of diagnosis to the date of death from any cause. For participants who are still alive at the time of analysis, survival time will be censored at the last contact date.

Time frame: Baseline to death (up to 642 days)

Population: All enrolled participants from Part 2 group, who received at least one dose of study drug. Per protocol, Part 1 was not included as it is an open-label safety lead-in portion with PK characterization.

PFS was defined as the time from the date of study enrollment to the first date of objectively determined progressive disease (PD) or death from any cause. PD was determined using Response Evaluation Criteria In Solid Tumors (RECIST version 1.0). PD is ≥20% increase in the sum of the longest diameter (LD) of target lesions taking as references the smallest sum LD recorded since the treatment started or the appearance of 1 or more new lesions. For participants not known to have died and who did not have PD, PFS was censored at the date of the last progression-free assessment. For participants who received subsequent systemic anticancer therapy (after discontinuation from the study treatment) prior to disease progression or death, PFS was censored at the date of last progression-free assessment prior to the initiation of post-discontinuation systemic anticancer therapy. No participant completed a full cycle of therapy and thus no formal analysis was performed.

Time frame: Baseline to measured PD (up to 487 days)

Population: All enrolled participants from Part 2 group, who received at least one dose of study drug. Per protocol, Part 1 was not included as it is an open-label safety lead-in portion with PK characterization.

Cmax,ss was calculated using concentration versus time data of enzastaurin, LSN326020, and total analyte (enzastaurin + LSN326020). Data are reported as Geometric Mean and Geometric Coefficient of Variation (%).

Time frame: Part 1: Cycle 1, Day 21 - predose 2, 4, 6, 8, and 24 hours postdose; Cycle 2, Day 1 - predose, 2, 3, 4, 8, and 24 hours postdose

Population: For Part 1, pharmacokinetic analyses were conducted for individual participants who received at least one dose of study drug and had pharmacokinetic samples collected.

PSA is a protein produced by the cells of the prostate gland. PSA is present in small quantities in the serum of men with healthy prostates, but is often elevated in the presence of prostate cancer and in other prostate disorders. A blood test to measure PSA is considered the most effective test currently available for the early detection of prostate cancer. Decline in PSA of ≥30% from baseline within the first 3 months of treatment was calculated.

Time frame: Baseline up to 3 months

Population: The analysis population included all participants having baseline and at least 1 postbaseline PSA response within the first 3 months of treatment.

AUCτ,ss was calculated using concentration versus time data of enzastaurin, LSN326020, and total analyte (enzastaurin + LSN326020). Data are reported as Geometric Mean and Geometric Coefficient of Variation (%).

Time frame: Part 1: Cycle 1, Day 21 - predose 2, 4, 6, 8, and 24 hours postdose; Cycle 2, Day 1 - predose, 2, 3, 4, 8, and 24 hours postdose; Part 2: Cycle 2, Day 1 - predose, 1-3, and 4-9 hours postdose

Population: Pharmacokinetic analyses were conducted for individual participants who received at least one dose of study drug and had pharmacokinetic samples collected.

AUC(0-∞) was calculated using concentration versus time data of docetaxel. Data are reported as Geometric Mean and Geometric Coefficient of Variation (%).

Time frame: Part 1: Cycle 1, Day 1 - predose 0.5, 1, 1.5, 2, 3, 4, 8, and 24 hours postdose; Cycle 2, Day 1 - predose, 0.5, 1, 1.5, 2, 3, 4, 8, and 24 hours postdose

Population: For Part 1, pharmacokinetic analyses were conducted for individual participants who received at least one dose of study drug and had pharmacokinetic samples collected.

Cmax was calculated using concentration versus time data of docetaxel. Data are reported as Geometric Mean and Geometric Coefficient of Variation (%).

Time frame: Part 1: Cycle 1, Day 1 - predose 0.5, 1, 1.5, 2, 3, 4, 8, and 24 hours postdose; Cycle 2, Day 1 - predose, 0.5, 1, 1.5, 2, 3, 4, 8, and 24 hours postdose

Population: For Part 1, pharmacokinetic analyses were conducted for individual participants who received at least one dose of study drug and had pharmacokinetic samples collected.

PSA is a protein produced by the cells of the prostate gland. PSA is present in small quantities in the serum of men with healthy prostates, but is often elevated in the presence of prostate cancer and in other prostate disorders. A blood test to measure PSA is considered the most effective test currently available for the early detection of prostate cancer. PSA velocity is computed for each participant by means of linear regression on the logarithm of PSA. The linear regression fits a line through the logarithm of the PSA value on the y-axis, and the time from baseline on the x-axis with the baseline PSA value at time zero. The resulting slope is PSA velocity.

Time frame: Baseline up to 2 months

Population: Participants with a valid baseline and at least 1 postbaseline PSA measurement within the first 2 months of treatment.

PSA is a protein produced by the cells of the prostate gland. PSA is present in small quantities in the serum of men with healthy prostates, but is often elevated in the presence of prostate cancer and in other prostate disorders. A blood test to measure PSA is considered the most effective test currently available for the early detection of prostate cancer. PSA velocity is computed for each participant by means of linear regression on the logarithm of PSA. The linear regression fits a line through the logarithm of the PSA value on the y-axis, and the time from baseline on the x-axis with the baseline PSA value at time zero. The resulting slope is PSA velocity.

Time frame: Baseline up to 3 months

Population: Participants with a valid baseline and at least 1 postbaseline PSA measurement within the first 3 months of treatment.

Pharmacogenomic (PGx) work on S032 was cancelled due to the limited number of tissue samples collected and the lack of clinical efficacy (responders) to enzastaurin. Potential biomarkers would have been assessed by dividing participants into low and high expression classes.

Time frame: Baseline up to 36 months

Population: Data were not collected for any participant due to low samples.