CLINICAL PHARMACOLOGY
Mechanism Of Action
Olaparib is an inhibitor of poly (ADP-ribose) polymerase (PARP) enzymes, including PARP1, PARP2, and PARP3. PARP enzymes are involved in normal cellular functions, such as DNA transcription and DNA repair. Olaparib has been shown to inhibit growth of select tumor cell lines in vitro and decrease tumor growth in mouse xenograft models of human cancer, both as monotherapy or following platinumbased chemotherapy. Increased cytotoxicity and anti-tumor activity following treatment with olaparib were noted in cell lines and mouse tumor models with deficiencies in BRCA and non-BRCA proteins involved in the homologous recombination repair (HRR) of DNA damage and correlated with platinum response. In vitro studies have shown that olaparib-induced cytotoxicity may involve inhibition of PARP enzymatic activity and increased formation of PARP-DNA complexes, resulting in DNA damage and cancer cell death.
Pharmacodynamics
Cardiac Electrophysiology
The effect of olaparib on cardiac repolarization was assessed in 119 patients following a single dose of 300 mg and in 109 patients following multiple dosing of 300 mg twice daily. No clinically relevant effect of olaparib on QT interval was observed.
Pharmacokinetics
The area under the curve (AUC) of olaparib increases approximately proportionally following administration of single doses of 25 mg to 450 mg (0.08 to 1.5 times the recommended dose) and maximal concentrations (Cmax) increased slightly less than proportionally for the same dose range.
Olaparib showed time-dependent pharmacokinetics and an AUC mean accumulation ratio of 1.8 is observed at steady state following a dose of 300 mg twice daily.
The mean (CV%) olaparib Cmax is 5.8 μg/mL (36%) and AUC is 42 μg*h/mL(51%) following a single 300 mg dose. The mean steady state olaparib Cmax and AUC is 7.7 μg/mL (40%) and 49 μg*h/mL (52%), following a dose of 300 mg twice daily.
Absorption
Following oral administration of olaparib, the median time to peak plasma concentration is 1.5 hours.
Effect of Food
Co-administration of a high fat and high calorie meal (800-1000 kcal, 50% of the calorie content made up from fat) with olaparib slowed the rate (tmax delayed by 2.5 hours) of absorption, but did not significantly alter the extent of olaparib absorption (mean AUC increased by approximately 8%).
Distribution
The mean (± standard deviation) apparent volume of distribution of olaparib is 158 ± 136 L following a single 300 mg dose of Lynparza. The protein binding of olaparib is approximately 82% in vitro.
Elimination
The mean (± standard deviation) terminal plasma half-life of olaparib is 14.9 ± 8.2 hours and the apparent plasma clearance is 7.4 ± 3.9 L/h following a single 300 mg dose of Lynparza.
Metabolism
Olaparib is metabolized by cytochrome P450 (CYP) 3A in vitro.
Following an oral dose of radiolabeled olaparib to female patients, unchanged olaparib accounted for 70% of the circulating radioactivity in plasma. It was extensively metabolized with unchanged drug accounting for 15% and 6% of radioactivity in urine and feces, respectively. The majority of the metabolism is attributable to oxidation reactions with a number of the components produced undergoing subsequent glucuronide or sulfate conjugation.
Excretion
Following a single dose of radiolabeled olaparib, 86% of the dosed radioactivity was recovered within a 7-day collection period, 44% via the urine and 42% via the feces. The majority of the material was excreted as metabolites.
Specific Populations
Patients With Renal Impairment
In a renal impairment trial, the mean AUC increased by 24% and Cmax by 15%, when olaparib was dosed in patients with mild renal impairment (CLcr=51-80 mL/min defined by the Cockcroft-Gault equation; n=13) and by 44% and 26%, respectively, when olaparib was dosed in patients with moderate renal impairment (CLcr=31-50 mL/min; n=13), compared to those with normal renal function (CLcr ≥81 mL/min; n=12). There was no evidence of a relationship between the extent of plasma protein binding of olaparib and creatinine clearance. There are no data in patients with severe renal impairment or end-stage renal disease (CLcr ≤30 mL/min).
Patients With Hepatic Impairment
In a hepatic impairment trial, the mean AUC increased by 15% and the mean Cmax increased by 13% when olaparib was dosed in patients with mild hepatic impairment (Child-Pugh classification A; n=10) and the mean AUC increased by 8% and the mean Cmax decreased by 13% when olaparib was dosed in patients with moderate hepatic impairment (Child-Pugh classification B; n=8), compared to patients with normal hepatic function (n=13). Hepatic impairment had no effect on the protein binding of olaparib and, therefore, total plasma exposure was representative of free drug. There are no data in patients with severe hepatic impairment (Child-Pugh classification C).
Drug Interaction Studies
Clinical Studies
CYP3A Inhibitors
Concomitant use of itraconazole (strong CYP3A inhibitor) increased olaparib Cmax by 42% and AUC by 170%. Concomitant use of fluconazole (moderate CYP3A inhibitor) is predicted to increase olaparib Cmax by 14% and AUC by 121%.
CYP3A Inducers
Concomitant use of rifampicin (strong CYP3A inducer) decreased olaparib Cmax by 71% and AUC by 87%. Concomitant use of efavirenz (moderate CYP3A inducer) is predicted to decrease olaparib Cmax by 31% and AUC by 60%.
In Vitro Studies
CYP Enzymes
Olaparib is both an inhibitor and inducer of CYP3A and an inducer of CYP2B6. Olaparib is predicted to be a weak CYP3A inhibitor in humans.
UGT Enzymes
Olaparib is an inhibitor of UGT1A1.
Transporters
Olaparib is an inhibitor of BCRP, OATP1B1, OCT1, OCT2, OAT3, MATE1, and MATE2K. Olaparib is a substrate and inhibitor of the efflux transporter P-gp. The potential for olaparib to induce P-gp has not been evaluated.
Clinical Studies
First-Line Maintenance Treatment Of BRCA-Mutated Advanced Ovarian Cancer
Solo-1
The efficacy of Lynparza was evaluated in SOLO-1 (NCT01844986), a randomized (2:1), double-blind, placebo-controlled, multi-center trial in patients with BRCA-mutated advanced ovarian, fallopian tube, or primary peritoneal cancer following first-line platinum-based chemotherapy. Patients were randomized to receive Lynparza tablets 300 mg orally twice daily or placebo. Treatment was continued for up to 2 years or until disease progression or unacceptable toxicity; however, patients with evidence of disease at 2 years, who in the opinion of the treating healthcare provider could derive further benefit from continuous treatment, could be treated beyond 2 years. Randomization was stratified by response to first-line platinum-based chemotherapy (complete or partial response). The major efficacy outcome was investigator-assessed progression-free survival (PFS) evaluated according to Response Evaluation Criteria in Solid Tumors (RECIST), version 1.1.
A total of 391 patients were randomized, 260 to Lynparza and 131 to placebo. The median age of patients treated with Lynparza was 53 years (range: 29 to 82) and 53 years (range: 31 to 84) among patients on placebo. The ECOG performance status (PS)was 0 in 77% of patients receiving Lynparza and 80% of patients receiving placebo. Of all patients, 82% were White, 36% were enrolled in the U.S. or Canada, and 82% were in complete response to their most recent platinum-based regimen. The majority of patients (n=389) had germline BRCA mutation (gBRCAm), and 2 patients had somatic BRCAm (sBRCAm).
Of the 391 patients randomized in SOLO-1, 386 were retrospectively or prospectively tested with a Myriad BRACAnalysis test and 383 patients were confirmed to have deleterious or suspected deleterious gBRCAm status; 253 were randomized to the Lynparza arm and 130 to the placebo arm. Two out of 391 patients randomized in SOLO-1 were confirmed to have sBRCAm based on an investigational Foundation Medicine tissue test.
SOLO-1 demonstrated a statistically significant improvement in investigator-assessed PFS for Lynparza compared to placebo. Results from a blinded independent review were consistent. At the time of the analysis of PFS, overall survival (OS) data were not mature (21% of patients had died). Efficacy results are presented in Table 15 and Figure 1.
Table 15: EfficacyResults – SOLO-1 (InvestigatorAssessment)
| Lynparza tablets (n=260) | Placebo (n=131) |
Progression-Free Survival* | | |
Number of events (%) | 102 (39%) | 96 (73%) |
Median, months | NR | 13.8 |
Hazard ratio† (95% CI) | 0.30 (0.23, 0.41) |
p-value‡ | <0.0001 |
* Median follow up of 41 months in both treatment arms. † A value <1 favors olaparib. Hazard ratio from a Cox proportional hazards model including response to previous platinum chemotherapy (complete response versus partial response) as a covariate. ‡ The p-value is derived from a stratified log-rank test. NR not reached; CI Confidence Interval. |
Figure 1: Kaplan-Meier Curves of Investigator-Assessed Progression-Free Survival - SOLO-1
First-Line Maintenance Treatment Of Advanced Ovarian Cancer In Combination With Bevacizumab
Paola-1
PAOLA-1 (NCT03737643) was a randomized, double-blind, placebo-controlled, multi-center trial that compared the efficacy of Lynparza in combination with bevacizumab versus placebo/bevacizumab for the maintenance treatment of advanced high-grade epithelial ovarian cancer, fallopian tube or primary peritoneal cancer following first-line platinum-based chemotherapy and bevacizumab. Randomization was stratified by first-line treatment outcome (timing and outcome of cytoreductive surgery and response to platinum-based chemotherapy) and tBRCAm status, determined by prospective local testing. All available clinical samples were retrospectively tested with Myriad myChoice® CDx. Patients were required to have no evidence of disease (NED) due to complete surgical resection, or who were in complete response (CR), or partial response (PR) following completion of first-line platinum-containing chemotherapy and bevacizumab. Patients were randomized (2:1) to receive Lynparza tablets 300 mg orally twice daily in combination with bevacizumab (n=537) 15 mg/kg every three weeks or placebo/bevacizumab (n=269) Patients continued bevacizumab in the maintenance setting and started treatment with Lynparza after a minimum of 3 weeks and up to a maximum of 9 weeks following completion of their last dose of chemotherapy. Lynparza treatment was continued for up to 2 years or until progression of the underlying disease or unacceptable toxicity. Patients who in the opinion of the treating physician could derive further benefit from continuous treatment could be treated beyond 2 years. Treatment with bevacizumab was for a total of up to 15 months, including the period given with chemotherapy and given as maintenance.
The major efficacy outcome measure was investigator-assessed PFS evaluated according to RECIST, version 1.1. An additional efficacy endpoint was overall survival (OS).
The median age of patients in both arms was 61 years overall (range 26 to 87). Ovarian cancer was the primary tumor type in 86% of patients in both arms. Ninety six percent (96%) were serous histological type. The ECOG performance score was 0 in 70% of patients and 1 in 28% of patients, overall. All patients had received first-line platinum-based therapy and bevacizumab. First-line treatment outcomes at screening indicated that patients had no evidence of disease with complete macroscopic resection at initial debulking surgery (32%, both arms), no evidence of disease/ CR with complete macroscopic resection at interval debulking surgery (31%, both arms), no evidence of disease/ CR in patients who had either incomplete resection (at initial or interval debulking surgery) or no debulking surgery (15%, both arms) and patients with a partial response (22%, both arms). Thirty percent (30%) of patients in both arms had a deleterious mutation. Patients were not restricted by the surgical outcome with 65% having complete cytoreduction at initial or interval debulking surgery and 35% having residual macroscopic disease. Demographics and baseline disease characteristics were balanced and comparable between the study and placebo arms in the Intention to Treat (ITT) population and also in the HRD positive subgroup.
Efficacy results from a biomarker subgroup analysis of 387 patients with HRD positive tumors, identified post-randomization using the Myriad myChoice® HRD Plus tumor test, who received Lynparza/bevacizumab (n=255) or placebo/bevacizumab (n=132), are summarized in Table 16 and Figure 2. Results from a blinded independent review of PFS were consistent. Overall survival data in this subpopulation were immature with 16% deaths.
Table 16: EfficacyResults – PAOLA-1 (HRD positive status*, InvestigatorAssessment)
| Lynparza/ bevacizumab (n=255) | Placebo/ bevacizumab (n=132) |
Progression-Free Survival | | |
Number of events (%) | 87 (34%) | 92 (70%) |
Median, months | 37.2 | 17.7 |
Hazard ratioa (95% CI) | 0.33 (0.25, 0.45) |
* Median follow-up of 27.4 months in Lynparza/bevacizumab arm and 27.5 months in placebo/bevacizumab arm. a The analysis was performed using an unstratifiedCox proportional hazards model. CI Confidence interval |
Figure 2: Kaplan-Meier Curves of Investigator-Assessed Progression-Free Survival – PAOLA-1 (HRD positive status)
Maintenance Treatment Of Recurrent Ovarian Cancer
The efficacy of Lynparza was investigated in two randomized, placebo-controlled, double-blind, multicenter studies in patients with recurrent ovarian cancers who were in response to platinum-based therapy.
SOLO-2
The efficacy of Lynparza was evaluated in SOLO-2 (NCT01874353), a randomized (2:1) double-blind, placebo-controlled trial in patients with gBRCAm ovarian, fallopian tube, or primary peritoneal cancer. Patients were randomized to Lynparza tablets 300 mg orally twice daily or placebo until unacceptable toxicity or progressive disease. Randomization was stratified by response to last platinum chemotherapy (complete versus partial) and time to disease progression in the penultimate platinum-based chemotherapy prior to enrollment (6-12 months versus >12 months). All patients had received at least two prior platinum-containing regimens and were in response (complete or partial) to their most recent platinum-based regimen. The major efficacy outcome measure was investigator-assessed PFS evaluated according to RECIST, version 1.1. An additional efficacy outcome measure was OS.
A total of 295 patients were randomized, 196 to Lynparza and 99 to placebo. The median age of patients treated with Lynparza was 56 years (range: 28 to 83) and 56 years (range: 39 to 78) among patients treated with placebo. The ECOG PS was 0 in 83% of patients receiving Lynparza and 78% of patients receiving placebo. Of all patients, 89% were White, 17% were enrolled in the U.S. or Canada, 47% were in complete response to their most recent platinum-based regimen, and 40% had a progression-free interval of 6-12 months since their penultimate platinum regimen. Prior bevacizumab therapy was reported for 17% of those treated with Lynparza and 20% of those receiving placebo. Approximately 44% of patients on the Lynparza arm and 37% on placebo had received three or more lines of platinum-based treatment.
All patients had a deleterious or suspected deleterious germline BRCA mutation as detected either by a local test (n=236) or central Myriad CLIA test (n=59), subsequently confirmed by BRACAnalysis CDx® (n=286).
SOLO-2 demonstrated a statistically significant improvement in investigator-assessed PFS in patients randomized to Lynparza as compared with placebo. Results from a blinded independent review were consistent. At the time of the analysis of PFS, OS data were not mature with 24% of events. Efficacy results are presented in Table 17 and Figure 3.
Table 17: EfficacyResults – SOLO-2 (InvestigatorAssessment)
| Lynparza tablets (n=196) | Placebo (n=99) |
Progression-Free Survival | | |
Number of events (%) | 107 (54.6%) | 80 (80.8%) |
Median, months | 19.1 | 5.5 |
Hazard ratio* (95% CI) | 0.30 (0.22, 0.41) |
p-value† | <0.0001 |
* Hazard ratio from a Cox proportional hazards model including response to last platinum chemotherapy (complete response versus partial response) and time to disease progression in the penultimate platinum-based chemotherapy prior to enrollment (6-12 month versus >12 months) as covariates. † The p-value is derived from a stratified log-rank test. |
Figure 3: Kaplan-Meier Curves of Investigator-Assessed Progression-Free Survival – SOLO-2
.
Study 19
The efficacy of Lynparza was evaluated in Study 19 (NCT00753545), a randomized (1:1) double-blind, placebo-controlled trial in patients with platinum-sensitive ovarian cancer who had received 2 or more previous platinum-containing regimens. Patients were randomized to Lynparza capsules 400 mg orally twice daily or placebo until unacceptable toxicity or progressive disease. Randomization was stratified by response to last platinum chemotherapy (complete response versus partial response), time to disease progression in the penultimate platinum-based chemotherapy (6-12 months versus >12 months), and descent (Jewish versus non-Jewish). The major efficacy outcome measure was investigator-assessed PFS according to RECIST, version 1.0.
A total of 265 patients were randomized, 136 to Lynparza and 129 to placebo. The median age of patients treated with Lynparza was 58 years (range: 21 to 89) and 59 years (range 33 to 84) among patients treated with placebo. ECOG PS was 0 in 81% of patients receiving Lynparza and 74% of patients receiving placebo. Of all patients, 97% were White, 19% were enrolled in the US or Canada, 45% were in complete response following their most recent platinum chemotherapy regimen, and 40% had a progression-free interval of 6-12 months since their penultimate platinum. Prior bevacizumab therapy was reported for 13% of patients receiving Lynparza and 16% of patients receiving placebo.
A retrospective analysis for germline BRCA mutation status, some performed using the Myriad test, indicated that 36% (n=96) of patients from the ITT population had deleterious gBRCA mutation, including 39% (n=53) of patients on Lynparza and 33% (n=43) of patients on placebo.
Efficacy results are presented in Table 18 and Figure 4. Study 19 demonstrated a statistically significant improvement in investigator-assessed PFS in patients treated with Lynparza versus placebo.
Table 18: EfficacyResults - Study 19 (InvestigatorAssessment)
| Lynparza capsules (n=136) | Placebo (n=129) |
Progression-Free Survival | | |
Number of events (%) | 60 (44%) | 94 (73%) |
Median, months | 8.4 | 4.8 |
Hazard ratio* (95% CI) | 0.35 (0.25, 0.49) |
p-value† | <0.0001 |
Overall Survival‡ | | |
Number of events (%) | 98 (72%) | 112 (87%) |
Median, months | 29.8 | 27.8 |
Hazard ratio (95% CI) | 0.73 (0.55, 0.95) |
* Hazard ratio from a Cox proportional hazards model including response to last platinum chemotherapy (complete response versus partial response), time to disease progression in the penultimate platinum-based chemotherapy (6-12 months versus >12 months) and Jewish descent (yes versus no) as covariates. † The p-value is derived from a Cox proportional hazards model. ‡ Without adjusting for multiple analyses. |
Figure 4: Kaplan-Meier Curves of Investigator-Assessed Progression-Free Survival – Study 19
AdvancedGermline BRCA-Mutated Ovarian Cancer Treated With 3 Or More Prior Lines Of Chemotherapy
The efficacy of Lynparza was investigated in a single-arm study of patients with deleterious or suspected deleterious gBRCAm advanced cancers. A total of 137 patients with measurable, advanced gBRCAm ovarian cancer treated with three or more prior lines of chemotherapy were enrolled. All patients received Lynparza capsules 400 mg orally twice daily until disease progression or intolerable toxicity. The efficacy outcome measures were objective response rate (ORR) and duration of response (DOR) as assessed by the investigator according to RECIST, version 1.0.
The median age of the patients was 58 years, the majority were White (94%) and 93% had an ECOG PS of 0 or 1. Deleterious or suspected deleterious gBRCAm status was verified retrospectively in 97% (59/61) of the patients for whom blood samples were available by the BRACAnalysis CDxTM.
Efficacy results are summarized in Table 19.
Table 19: Overall Response and Duration of Response in Patients with gBRCA-Mutated Advanced Ovarian Cancer Who Received 3 or More Lines of Chemotherapy
| Lynparza Capsules n=137 |
Objective Response Rate (95% CI) | 34% (26, 42) |
Complete response | 2% |
Partial response | 32% |
Median DOR in months (95% CI) | 7.9 (5.6, 9.6) |
Treatment Of Germline BRCA-Mutated HER2-Negative Metastatic Breast Cancer
OlympiAD
The efficacy of Lynparza was evaluated in OlympiAD (NCT02000622), an open-label randomized (2:1) study in patients with gBRCAm HER2-negative metastatic breast cancer. Patients were required to have received treatment with an anthracycline (unless contraindicated) and a taxane, in the neoadjuvant, adjuvant or metastatic setting. Patients with hormone receptor-positive disease must have progressed on at least 1 endocrine therapy (adjuvant or metastatic), or have disease that the treating healthcare provider believed to be inappropriate for endocrine therapy. Patients with prior platinum therapy were required to have no evidence of disease progress during platinum treatment. No prior treatment with a PARP inhibitor was permitted. Patients were randomized to Lynparza tablets 300 mg orally twice daily or healthcare provider’s choice of chemotherapy (capecitabine, eribulin, or vinorelbine, at standard doses) until progression or unacceptable toxicity. Randomization was stratified by prior use of chemotherapy for metastatic disease (yes vs no), hormone receptor status (hormone receptor positive vs triple negative), and previous use of platinum-based chemotherapy (yes vs no). The major efficacy outcome measure was PFS assessed by blinded independent central review (BICR) using RECIST version 1.1.
A total of 302 patients were randomized, 205 to Lynparza and 97 to chemotherapy. Among the 205 patients treated with Lynparza, the median age was 44 years (range: 22 to 76), 65% were White, 4% were males and all the patients had an ECOG PS of 0 or 1. Approximately 50% of patients had triple-negative tumors and 50% had estrogen receptor and/or progesterone receptor positive tumors and the proportions were balanced across treatment arms. Patients in each treatment arm had received a median of 1 prior chemotherapy regimen for metastatic disease; approximately 30% had not received a prior chemotherapy regimen for metastatic breast cancer. Twenty-one percent of patients in the Lynparza arm and 14% in the chemotherapy arm had received platinum therapy for metastatic disease. Seven percent of patients in each treatment arm had received platinum therapy for localized disease.
Of the 302 patients randomized onto OlympiAD, 299 were tested with the BRACAnalysis CDx® and 297 were confirmed to have deleterious or suspected deleterious gBRCAm status; 202 were randomized to the Lynparza arm and 95 to the healthcare provider’s choice of chemotherapy arm.
A statistically significant improvement in PFS was demonstrated for the Lynparza arm compared to the chemotherapy arm. Efficacy data for OlympiAD are displayed in Table 20 and Figure 5. Consistent results were observed across patient subgroups defined by study stratification factors. An exploratory analysis of investigator-assessed PFS was consistent with the BICR-assessed PFS results.
Table 20: EfficacyResults - OlympiAD (BICR-assessed)
| Lynparza tablets (n=205) | Chemotherapy (n=97) |
Progression-Free Survival | | |
Number of events (%) | 163 (80%) | 71 (73%) |
Median, months | 7.0 | 4.2 |
Hazard ratio (95% CI)* | 0.58 (0.43, 0.80) |
p-value† | 0.0009 |
Patients with Measurable Disease | n=167 | n=66 |
Objective Response Rate (95% CI)‡ | 52% (44, 60) | 23% (13, 35) |
Overall Survival | |
Number of events (%) | 130 (63%) | 62 (64%) |
Median, months | 19.3 | 17.1 |
Hazard ratio (95% CI)* | 0.90 (0.66, 1.23) |
* Hazard ratio is derived from a stratified log-rank test, stratified by ER, PgR negative versus ER and or PgR positive and prior chemotherapy (yes versus no). † For PFS, p-value (2-sided) was compared to 0.05. ‡ Response based on confirmed responses. The confirmed complete response rate was 7.8% for Lynparza compared to 1.5% for chemotherapy arm. |
Figure 5: Kaplan-Meier Curves of Progression-Free Survival – OlympiAD
First-Line Maintenance Treatment Of Germline BRCA-Mutated Metastatic Pancreatic Adenocarcinoma
Polo
The efficacy of Lynparza was evaluated in POLO (NCT02184195), a randomized (3:2), double-blind placebo-controlled, multi-center trial. Patients were required to have metastatic pancreatic adenocarcinoma with a deleterious or suspected deleterious germline BRCA mutation (gBRCAm) and absence of disease progression after receipt of first-line platinum-based chemotherapy for at least 16 weeks. Patients were randomized to receive Lynparza tablets 300 mg orally twice daily or placebo until disease progression or unacceptable toxicity. The major efficacy outcome measure was PFS by BICR using RECIST, version 1.1 modified to assess patients with clinical complete response at entry who were assessed as having no evidence of disease unless they had progressed based on the appearance of new lesions. Additional efficacy outcome measures were OS and ORR.
A total of 154 patients were randomized, 92 to Lynparza and 62 to placebo. The median age was 57 years (range 36 to 84); 54% were male; 92% were White, 4% were Asian and 3% were Black; baseline ECOG PS was 0 (67%) or 1 (31%). The median time from initiation of first-line platinum-based chemotherapy to randomization was 5.8 months (range 3.4 to 33.4 months). Seventy-five percent (75%) of patients received FOLFIRINOX with a median of 9 cycles (range 4-61), 8% received FOLFOX or XELOX, 4% received GEMOX, and 3% received gemcitabine plus cisplatin; 49% achieved a complete or partial response to platinum-based chemotherapy.
All patients had a deleterious or suspected deleterious germline BRCA-mutation as detected by the Myriad BRACAnalysis® or BRACAnalysis CDx® at a central laboratory only (n=106), local BRCA test only (n=4), or both local and central testing (n=44). Among the 150 patients with central test results, 30% had a mutation in BRCA1; 69% had a mutation in BRCA2; and 1 patient (1%) had mutations in both BRCA1 and BRCA2.
Efficacy results of POLO are provided in Table 21 and Figure 6.
Table 21: EfficacyResults - POLO (BICR-assessed)
| Lynparza tablets (n=92) | Placebo (n=62) |
Progression-Free Survival | |
Number of events (%)* | 60 (65%) | 44 (71%) |
Median, months (95% CI) | 7.4 (4.1, 11.0) | 3.8 (3.5, 4.9) |
Hazard ratio** (95% CI) | 0.53 (0.35, 0.81) |
p-value | 0.0035 |
Patients with Measurable Disease | n=78 | n=52 |
Objective Response Rate (95% CI) | 23% (14, 34) | 12% (4, 23) |
Complete response (%) | 2 (2.6) | 0 |
Partial response (%) | 16 (21) | 6 (12) |
Duration of Response (DOR) | | |
Median time in months (95% CI) | 25 (15, NC) | 4 (2, NC) |
* Number of events: Progression – Lynparza 55, placebo 44; death before BICR-documented progression – Lynparza 5, placebo 0 ** Hazard ratio, 95% CI, and p-value calculated from a log-rank test. A hazard ratio <1 favorsLynparza. NC Not calculable |
The result of an OS interim analysis conducted based on 67% information fraction did not show a statistically significant improvement in OS for Lynparza compared to placebo.
Figure 6: Kaplan-Meier Curves of BICR-Assessed Progression-Free Survival - POLO