Clinical Pharmacology for Avastin
Mechanism Of Action
Bevacizumab binds VEGF and prevents the interaction of VEGF to its receptors (Flt-1 and KDR) on the surface of endothelial cells. The interaction of VEGF with its receptors leads to endothelial cell proliferation and new blood vessel formation in in vitro models of angiogenesis. Administration of bevacizumab to xenotransplant models of colon cancer in nude (athymic) mice caused reduction of microvascular growth and inhibition of metastatic disease progression.
Pharmacokinetics
The pharmacokinetic profile of bevacizumab was assessed using an assay that measures total serum bevacizumab concentrations (i.e., the assay did not distinguish between free bevacizumab and bevacizumab bound to VEGF ligand). Based on a population pharmacokinetic analysis of 491 patients who received 1 to 20 mg/kg of Avastin every week, every 2 weeks, or every 3 weeks, bevacizumab pharmacokinetics are linear and the predicted time to reach more than 90% of steady state concentration is 84 days. The accumulation ratio following a dose of 10 mg/kg once every 2 weeks is 2.8.
Population simulations of bevacizumab exposures provide a median trough concentration of 80.3 mcg/mL on Day 84 (10th, 90th percentile: 45, 128) following a dose of 5 mg/kg once every two weeks.
Distribution
The mean (% coefficient of variation [CV%]) central volume of distribution is 2.9 (22%) L.
Elimination
The mean (CV%) clearance is 0.23 (33) L/day. The estimated half-life is 20 days (11 to 50 days).
Specific Populations
The clearance of bevacizumab varied by body weight, sex, and tumor burden. After correcting for body weight, males had a higher bevacizumab clearance (0.26 L/day vs. 0.21 L/day) and a larger central volume of distribution (3.2 L vs. 2.7 L) than females. Patients with higher tumor burden (at or above median value of tumor surface area) had a higher bevacizumab clearance (0.25 L/day vs. 0.20 L/day) than patients with tumor burdens below the median. In Study AVF2107g, there was no evidence of lesser efficacy (hazard ratio for overall survival) in males or patients with higher tumor burden treated with Avastin as compared to females and patients with low tumor burden.
Animal Toxicology And/Or Pharmacology
Rabbits dosed with bevacizumab exhibited reduced wound healing capacity. Using full-thickness skin incision and partial thickness circular dermal wound models, bevacizumab dosing resulted in reductions in wound tensile strength, decreased granulation and re-epithelialization, and delayed time to wound closure.
Clinical Studies
Metastatic Colorectal Cancer
Study AVF2107g
The safety and efficacy of Avastin was evaluated in a double-blind, active-controlled study [AVF2107g (NCT00109070)] in 923 patients with previously untreated mCRC who were randomized (1:1:1) to placebo with bolus-IFL (irinotecan 125 mg/m², fluorouracil 500 mg/m², and leucovorin 20 mg/m² given once weekly for 4 weeks every 6 weeks), Avastin (5 mg/kg every 2 weeks) with bolus-IFL, or Avastin (5 mg/kg every 2 weeks) with fluorouracil and leucovorin. Enrollment to the Avastin with fluorouracil and leucovorin arm was discontinued after enrollment of 110 patients in accordance with the protocol-specified adaptive design. Avastin was continued until disease progression or unacceptable toxicity or for a maximum of 96 weeks. The main outcome measure was overall survival (OS).
The median age was 60 years; 60% were male, 79% were White, 57% had an ECOG performance status of 0, 21% had a rectal primary and 28% received prior adjuvant chemotherapy. The dominant site of disease was extra-abdominal in 56% of patients and was the liver in 38% of patients.
The addition of Avastin improved survival across subgroups defined by age (< 65 years, ≥ 65 years) and sex. Results are presented in Table 11 and Figure 1.
Table 11: Efficacy Results in Study AVF2107g
| Efficacy Parameter |
Avastin with bolus-IFL
(N=402) |
Placebo with bolus-IFL
(N=411) |
| Overall Survival |
| Median, in months |
20.3 |
15.6 |
| Hazard ratio |
0.66 |
| (95% CI) |
(0.54, 0.81) |
| p-valuea |
< 0.001 |
| Progression-Free Survival |
| Median, in months |
10.6 |
6.2 |
| Hazard ratio |
0.54 |
| (95% CI) |
(0.45, 0.66) |
| p-valuea |
< 0.001 |
| Overall Response Rate |
| Rate (%) |
45% |
35% |
| p-valueb |
< 0.01 |
| Duration of Response |
| Median, in months |
10.4 |
7.1 |
a by stratified log-rank test.
b by χ2 test |
Figure 1: Kaplan-Meier Curves for Duration of Survival in Metastatic Colorectal Cancer in Study AVF2107g
Among the 110 patients randomized to Avastin with fluorouracil and leucovorin, median OS was 18.3 months, median progression-free survival (PFS) was 8.8 months, overall response rate (ORR) was 39%, and median duration of response was 8.5 months.
Study E3200
The safety and efficacy of Avastin were evaluated in a randomized, open-label, active-controlled study [E3200 (NCT00025337)] in 829 patients who were previously treated with irinotecan and fluorouracil for initial therapy for metastatic disease or as adjuvant therapy. Patients were randomized (1:1:1) to FOLFOX4 (Day 1: oxaliplatin 85 mg/m² and leucovorin 200 mg/m² concurrently, then fluorouracil 400 mg/m² bolus followed by 600 mg/m² continuously; Day 2: leucovorin 200 mg/m², then fluorouracil 400 mg/m² bolus followed by 600 mg/m² continuously; every 2 weeks), Avastin (10 mg/kg every 2 weeks prior to FOLFOX4 on Day 1) with FOLFOX4, or Avastin alone (10 mg/kg every 2 weeks). Avastin was continued until disease progression or unacceptable toxicity. The main outcome measure was OS.
The Avastin alone arm was closed to accrual after enrollment of 244 of the planned 290 patients following a planned interim analysis by the data monitoring committee based on evidence of decreased survival compared to FOLFOX4 alone.
The median age was 61 years; 60% were male, 87% were White, 49% had an ECOG performance status of 0, 26% received prior radiation therapy, and 80% received prior adjuvant chemotherapy, 99% received prior irinotecan with or without fluorouracil for metastatic disease, and 1% received prior irinotecan and fluorouracil as adjuvant therapy.
The addition of Avastin to FOLFOX4 resulted in significantly longer survival as compared to FOLFOX4 alone; median OS was 13.0 months vs. 10.8 months [hazard ratio (HR) 0.75 (95% CI: 0.63, 0.89), p-value of 0.001 stratified log-rank test] with clinical benefit seen in subgroups defined by age (< 65 years, ≥ 65 years) and sex. PFS and ORR based on investigator assessment were higher in patients receiving Avastin with FOLFOX4.
Study TRC-0301
The activity of Avastin with fluorouracil (as bolus or infusion) and leucovorin was evaluated in a single arm study [TRC-0301 (NCT00066846)] enrolling 339 patients with mCRC with disease progression following both irinotecan- and oxaliplatin-based chemotherapy. Seventy-three percent of patients received concurrent bolus fluorouracil and leucovorin. One objective partial response was verified in the first 100 evaluable patients for an ORR of 1% (95% CI: 0%, 5.5%).
Study ML18147
The safety and efficacy of Avastin were evaluated in a prospective, randomized, open-label, multinational, controlled study [ML18147 (NCT00700102)] in 820 patients with histologically confirmed mCRC who had progressed on a first-line Avastin containing regimen. Patients were excluded if they progressed within 3 months of initiating first-line chemotherapy and if they received Avastin for less than 3 consecutive months in the first-line setting. Patients were randomized (1:1) within 3 months after discontinuing Avastin as first-line treatment to receive fluoropyrimidine-irinotecan-or fluoropyrimidine-oxaliplatin-based chemotherapy with or without Avastin (5 mg/kg every 2 weeks or 7.5 mg/kg every 3 weeks). The choice of second-line treatment was contingent upon first-line chemotherapy. Second-line treatment was administered until progressive disease or unacceptable toxicity. The main outcome measure was OS. A secondary outcome measure was ORR.
The median age was 63 years (21 to 84 years); 64% were male, 52% had an ECOG performance status of 1, 44% had an ECOG performance status of 0, 58% received irinotecan-based therapy as first-line treatment, 55% progressed on first-line treatment within 9 months, and 77% received their last dose of Avastin as first-line treatment within 42 days of being randomized. Second-line chemotherapy regimens were generally balanced between each arm.
The addition of Avastin to fluoropyrimidine-based chemotherapy resulted in a statistically significant prolongation of OS and PFS. There was no significant difference in ORR. Results are presented in Table 12 and Figure 2.
Table 12: Efficacy Results in Study ML18147
| Efficacy Parameter |
Avastin with Chemotherapy (N=409) |
Chemotherapy (N=411) |
| Overall Survivala |
| Median, in months |
11.2 |
9.8 |
| Hazard ratio (95% CI) |
0.81 (0.69, 0.94) |
| Progression-Free Survivalb |
| Median, in months |
5.7 |
4.0 |
| Hazard ratio (95% CI) |
0.68 (0.59, 0.78) |
a p=0.0057 by unstratified log-rank test.
b p-value < 0.0001 by unstratified log-rank test. |
Figure 2: Kaplan-Meier Curves for Duration of Survival in Metastatic Colorectal Cancer in Study ML18147
Lack Of Efficacy in Adjuvant Treatment Of Colon Cancer
Lack of efficacy of Avastin as an adjunct to standard chemotherapy for the adjuvant treatment of colon cancer was determined in two randomized, open-label, multicenter clinical studies. The first study [BO17920 (NCT00112918)] was conducted in 3451 patients with high-risk stage II and III colon cancer, who had undergone surgery for colon cancer with curative intent. Patients were randomized to receive Avastin at a dose equivalent to 2.5 mg/kg/week on either a 2-weekly schedule with FOLFOX4 (N=1155) or on a 3-weekly schedule with XELOX (N=1145) or FOLFOX4 alone (N=1151). The main outcome measure was disease free survival (DFS) in patients with stage III colon cancer.
The median age was 58 years; 54% were male, 84% were White and 29% were ≥ 65 years. Eighty-three percent had stage III disease.
The addition of Avastin to chemotherapy did not improve DFS. As compared to FOLFOX4 alone, the proportion of stage III patients with disease recurrence or with death due to disease progression were numerically higher for patients receiving Avastin with FOLFOX4 or with XELOX. The hazard ratios for DFS were 1.17 (95% CI: 0.98,1.39) for Avastin with FOLFOX4 versus FOLFOX4 alone and 1.07 (95% CI: 0.90, 1.28)for Avastin with XELOX versus FOLFOX4 alone. The hazard ratios for OS were 1.31 (95% CI: 1.03, 1.67)and 1.27 (95% CI: 1, 1.62) for the comparison of Avastin with FOLFOX4 versus FOLFOX4 alone and Avastin with XELOX versus FOLFOX4 alone, respectively. Similar lack of efficacy for DFS was observed in the Avastin-containing arms compared to FOLFOX4 alone in the high-risk stage II cohort.
In a second study [NSABP-C-08 (NCT00096278)], patients with stage II and III colon cancer who had undergone surgery with curative intent, were randomized to receive either Avastin administered at a dose equivalent to 2.5 mg/kg/week with mFOLFOX6 (N=1354) or mFOLFOX6 alone (N=1356). The median age was 57 years, 50% were male and 87% White. Seventy-five percent had stage III disease. The main outcome was DFS among stage III patients. The HR for DFS was 0.92 (95% CI: 0.77, 1.10). OS was not significantly improved with the addition of Avastin to mFOLFOX6 [HR 0.96 (95% CI: 0.75,1.22)].
First-Line Non–Squamous Non–Small Cell Lung Cancer
Study E4599
The safety and efficacy of Avastin as first-line treatment of patients with locally advanced, metastatic, or recurrent non–squamous NSCLC was studied in a single, large, randomized, active-controlled, open-label, multicenter study [E4599 (NCT00021060)]. A total of 878 chemotherapy-naïve patients with locally advanced, metastatic or recurrent non–squamous NSCLC were randomized (1:1) to receive six 21-day cycles of paclitaxel (200 mg/m²) and carboplatin (AUC6) with or without Avastin 15 mg/kg. After completing or discontinuing chemotherapy, patients randomized to receive Avastin continued to receive Avastin alone until disease progression or until unacceptable toxicity. The trial excluded patients with predominant squamous histology (mixed cell type tumors only), CNS metastasis, gross hemoptysis (½ teaspoon or more of red blood), unstable angina, or receiving therapeutic anticoagulation. The main outcome measure was duration of survival.
The median age was 63 years; 54% were male, 43% were ≥ 65 years, and 28% had ≥5% weight loss at study entry. Eleven percent had recurrent disease. Of the 89% with newly diagnosed NSCLC, 12% had Stage IIIB with malignant pleural effusion and 76% had Stage IV disease.
OS was statistically significantly longer for patients receiving Avastin with paclitaxel and carboplatin compared with those receiving chemotherapy alone. Median OS was 12.3 months vs. 10.3 months [HR 0.80 (95% CI: 0.68, 0.94), final p-value of 0.013, stratified log-rank test]. Based on investigator assessment which was not independently verified, patients were reported to have longer PFS with Avastin with paclitaxel and carboplatin compared to chemotherapy alone. Results are presented in Figure 3.
Figure 3: Kaplan-Meier Curves for Duration of Survival in First-Line Non-Squamous Non-Small Cell Lung Cancer in Study E4599
In an exploratory analysis across patient subgroups, the impact of Avastin on OS was less robust in the following subgroups: women [HR0.99 (95% CI: 0.79, 1.25)], patients ≥ 65 years [HR0.91 (95% CI: 0.72, 1.14)] and patients with ≥5% weight loss at study entry [HR0.96 (95% CI: 0.73, 1.26)].
Study BO17704
The safety and efficacy of Avastin in patients with locally advanced, metastatic or recurrent non-squamous NSCLC, who had not received prior chemotherapy was studied in another randomized, double-blind, placebo-controlled study [BO17704 (NCT00806923)]. A total of 1043 patients were randomized (1:1:1) to receive cisplatin and gemcitabine with placebo, Avastin 7.5 mg/kg or Avastin 15 mg/kg. The main outcome measure was PFS. Secondary outcome measure was OS.
The median age was 58 years; 36% were female and 29% were ≥ 65 years. Eight percent had recurrent disease and 77% had Stage IV disease.
PFS was significantly higher in both Avastin-containing arms compared to the placebo arm [HR 0.75 (95% CI: 0.62, 0.91), p-value of0.0026 for Avastin 7.5 mg/kg and HR 0.82 (95% CI: 0.68; 0.98), p-value of0.0301 for Avastin 15 mg/kg]. The addition of Avastin to cisplatin and gemcitabine failed to demonstrate an improvement in the duration of OS [HR 0.93 (95% CI: 0.78; 1.11), p-value of0.420 for Avastin 7.5 mg/kg and HR 1.03 (95% CI:0.86, 1.23), p-value of 0.761 for Avastin 15 mg/kg].
Recurrent Glioblastoma
Study EORTC 26101
The safety and efficacy of Avastin were evaluated in a multicenter, randomized (2:1), open-label study in patients with recurrent GBM (EORTC 26101, NCT01290939). Patients with first progression following radiotherapy and temozolomide were randomized (2:1) to receive Avastin (10 mg/kg every 2 weeks) with lomustine (90 mg/m² every 6 weeks) or lomustine (110 mg/m² every 6 weeks) alone until disease progression or unacceptable toxicity. Randomization was stratified by World Health Organization performance status (0 vs. >0), steroid use (yes vs. no), largest tumor diameter (≤ 40 vs. > 40 mm), and institution. The main outcome measure was OS. Secondary outcome measures were investigator-assessed PFS and ORR per the modified Response Assessment in Neuro-oncology (RANO) criteria, health related quality of life (HRQoL), cognitive function, and corticosteroid use.
A total of 432 patients were randomized to receive lomustine alone (N=149) or Avastin with lomustine (N=283). The median age was 57 years; 24.8% of patients were ≥ 65 years. The majority of patients with were male (61%); 66% had a WHO performance status score > 0; and in 56% the largest tumor diameter was ≤ 40 mm. Approximately 33% of patients randomized to receive lomustine received Avastin following documented progression.
No difference in OS (HR 0.91, p-value of 0.4578) was observed between arms; therefore, all secondary outcome measures are descriptive only. PFS was longer in the Avastin with lomustine arm [HR 0.52 (95% CI: 0.41, 0.64)] with a median PFS of 4.2 months in the Avastin with lomustine arm and 1.5 months in the lomustine arm. Among the 50% of patients receiving corticosteroids at the time of randomization, a higher percentage of patients in the Avastin with lomustine arm discontinued corticosteroids (23% vs. 12%).
Study AVF3708g And Study NCI 06-C-0064E
The efficacy and safety of Avastin 10 mg/kg every 2 weeks in patients with previously treated GBM were evaluated in one single arm single center study (NCI 06-C-0064E) and a randomized noncomparative multicenter study [AVF3708g (NCT00345163)]. Response rates in both studies were evaluated based on modified WHO criteria that considered corticosteroid use. In AVF3708g, the response rate was 25.9% (95% CI: 17%, 36.1%) with a median duration of response of 4.2 months (95% CI: 3, 5.7). In Study NCI 06-C-0064E, the response rate was 19.6% (95% CI: 10.9%, 31.3%) with a median duration of response of 3.9 months (95% CI: 2.4, 17.4).
Metastatic Renal Cell Carcinoma
Study BO17705
The safety and efficacy of Avastin were evaluated in patients with treatment-naïve mRCC in a multicenter, randomized, double-blind, international study [BO17705 (NCT00738530)] comparing interferon alfa and Avastin versus interferon alfa and placebo. A total of 649 patients who had undergone a nephrectomy were randomized (1:1) to receive either Avastin (10 mg/kg every 2 weeks; N = 327) or placebo (every 2 weeks; N = 322) with interferon alfa (9 MIU subcutaneously three times weekly for a maximum of 52 weeks). Patients were treated until disease progression or unacceptable toxicity. The main outcome measure was investigator-assessed PFS. Secondary outcome measures were ORR and OS.
The median age was 60 years (18 to 82 years); 70% were male and 96% were White. The study population was characterized by Motzer scores as follows: 28% favorable (0), 56% intermediate (1-2), 8% poor (3-5), and 7% missing.
PFS was statistically significantly prolonged among patients receiving Avastin compared to placebo; median PFS was 10.2 months vs. 5.4 months [HR 0.60 (95% CI: 0.49, 0.72), p-value < 0.0001, stratified log-rank test]. Among the 595 patients with measurable disease, ORR was also significantly higher (30% vs. 12%, p-value < 0.0001, stratified CMH test). There was no improvement in OS based on the final analysis conducted after 444 deaths, with a median OS of 23 months in the patients receiving Avastin with interferon alfa and 21 months in patients receiving interferon alone [HR 0.86, (95% CI: 0.72, 1.04)]. Results are presented in Figure 4.
Figure 4: Kaplan-Meier Curves for Progression-Free Survival in Metastatic Renal Cell Carcinoma in Study BO17705
Persistent, Recurrent, Or Metastatic Cervical Cancer
Study GOG-0240
The safety and efficacy of Avastin were evaluated in patients with persistent, recurrent, or metastatic cervical cancer in a randomized, four-arm, multicenter study comparing Avastin with chemotherapy versus chemotherapy alone [GOG-0240 (NCT00803062)]. A total of 452 patients were randomized (1:1:1:1) to receive paclitaxel and cisplatin with or without Avastin, or paclitaxel and topotecan with or without Avastin.
The dosing regimens for Avastin, paclitaxel, cisplatin and topotecan were as follows:
- Day 1: Paclitaxel 135 mg/m² over 24 hours, Day 2: cisplatin 50 mg/m² with Avastin;
- Day 1: Paclitaxel 175 mg/m² over 3 hours, Day 2: cisplatin 50 mg/m² with Avastin;
- Day 1: Paclitaxel 175 mg/m² over 3 hours with cisplatin 50 mg/m² with Avastin;
- Day 1: Paclitaxel 175 mg/m² over 3 hours with Avastin, Days 1-3: topotecan IV 0.75 mg/m² over 30 minutes
Patients were treated until disease progression or unacceptable adverse reactions. The main outcome measure was OS. Secondary outcome measures included ORR.
The median age was 48 years (20 to 85 years). Of the 452 patients randomized at baseline, 78% of patients were White, 80% had received prior radiation, 74% had received prior chemotherapy concurrent with radiation, and 32% had a platinum-free interval (PFI) of less than 6 months. Patients had a GOG performance status of 0 (58%) or 1 (42%). Demographic and disease characteristics were balanced across arms.
Results are presented in Figure 5 and Table 13.
Figure 5: Kaplan-Meier Curves for Overall Survival in Persistent, Recurrent, or Metastatic CervicalCancer in Study GOG-0240
Table 13: Efficacy Results in Study GOG-0240
| Efficacy Parameter |
Avastin with Chemotherapy
(N=227) |
Chemotherapy
(N=225) |
| Overall Survival |
| Median, in monthsa |
16.8 |
12.9 |
| Hazard ratio (95% CI) |
0.74 (0.58, 0.94) |
| p-valueb |
0.0132 |
a Kaplan-Meier estimates.
b log-rank test (stratified). |
The ORR was higher in patients who received Avastin with chemotherapy [45% (95% CI: 39, 52)] compared to patients who received chemotherapy alone [34% (95% CI: 28,40)].
Table 14: Efficacy Results in Study GOG-0240
| Efficacy Parameter |
Topotecan and Paclitaxel with or without Avastin
(N=223) |
Cisplatin and Paclitaxel with or without Avastin
(N=229) |
| Overall Survival |
| Median, in monthsa |
13.3 |
15.5 |
| Hazard ratio (95% CI) |
1.15 (0.91, 1.46) |
| p-value |
0.23 |
| a Kaplan-Meier estimates. |
The HR for OS with Avastin with cisplatin and paclitaxel as compared to cisplatin and paclitaxel alone was 0.72 (95% CI: 0.51,1.02). The HR for OS with Avastin with topotecan and paclitaxel as compared to topotecan and paclitaxel alone was 0.76 (95% CI: 0.55, 1.06).
Stage III Or IV Epithelial Ovarian, Fallopian Tube, Or Primary Peritoneal Cancer Following Initial Surgical Resection
Study GOG-0218
The safety and efficacy of Avastin were evaluated in a multicenter, randomized, double-blind, placebo controlled, three arm study [Study GOG-0218 (NCT00262847)] evaluating the effect of adding Avastin to carboplatin and paclitaxel for the treatment of patients with stage III or IV epithelial ovarian, fallopian tube or primary peritoneal cancer (N=1873) following initial surgical resection. Patients were randomized (1:1:1) to one of the following arms:
- CPP: carboplatin (AUC 6) and paclitaxel (175 mg/m²) for six cycles, with concurrent placebo started at cycle 2, followed by placebo alone every three weeks for a total of up to 22 cycles of therapy (n=625) or
- CPB15: carboplatin (AUC 6) and paclitaxel (175 mg/m²) for six cycles, with concurrent Avastin started at cycle 2, followed by placebo alone every three weeks for a total of up to 22 cycles of therapy (n=625) or
- CPB15+: carboplatin (AUC 6) and paclitaxel (175 mg/m²) for six cycles, with concurrent Avastin started at cycle 2, followed by Avastin as a single agent every three weeks for a total of up to 22 cycles of therapy (n=623).
The main outcome measure was investigator-assessed PFS. OS was a secondary outcome measure.
The median age was 60 years (range 22-89 years) and 28% of patients were >65 years of age. Overall, approximately 50% of patients had a GOG PS of 0 at baseline, and 43% a GOG PS score of 1. Patients had either epithelial ovarian cancer (83%), primary peritoneal cancer (15%), or fallopian tube cancer (2%). Serous adenocarcinoma was the most common histologic type (85% in CPP and CPB15 arms, 86% in CPB15+ arm). Overall, approximately 34% of patients had resected FIGO Stage III with residual disease < 1 cm, 40% had resected Stage III with residual disease >1 cm, and 26% had resected Stage IV disease.
The majority of patients in all three treatment arms received subsequent antineoplastic treatment, 78.1% in the CPP arm, 78.6% in the CPB15 arm, and 73.2% in the CPB15+ arm. A higher proportion of patients in the CPP arm (25.3%) and CPB15 arm (26.6%) received at least one anti-angiogenic (including bevacizumab) treatment after discontinuing from study compared with the CPB15+ arm (15.6%).
Study results are presented in Table 15 and Figure 6.
Table 15: Efficacy Results in Study GOG-0218
| Efficacy Parameter |
Avastin with carboplatin and paclitaxel followed by Avastin alone
(N=623) |
Avastin with carboplatin and paclitaxel
(N=625) |
Carboplatin and paclitaxel
(N= 625) |
| Progression-Free Survival per Investigator |
| Median, in months |
18.2 |
12.8 |
12.0 |
| Hazard ratio (95% CI)a |
0.62 (0.52, 0.75) |
0.83 (0.70, 0.98) |
|
| p -valueb |
< 0.0001 |
NS |
|
| Overall Survivalc |
| Median, in months |
43.8 |
38.8 |
40.6 |
| Hazard ratio (95% CI)a |
0.89 (0.76, 1.05) |
1.06 (0.90, 1.24) |
|
NS=not significant
a Relative to the control arm; stratified hazard ratio
b Two-sided p-value based on re-randomization test
c Final overall survival analysis |
Figure 6: Kaplan-Meier Curves for Investigator-Assessed Progression-Free Survival in Stage III or IV Epithelial Ovarian, Fallopian Tube, or Primary Peritoneal Cancer Following Initial Surgical Resection in Study GOG-0218
Platinum-Resistant Recurrent Epithelial Ovarian, Fallopian Tube, Or Primary Peritoneal Cancer
Study MO22224
The safety and efficacy of Avastin were evaluated in a multicenter, open-label, randomized study [MO22224 (NCT00976911)] comparing Avastin with chemotherapy versus chemotherapy alone in patients with platinum-resistant, recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer that recurred within <6 months from the most recent platinum-based therapy (N=361). Patients had received no more than 2 prior chemotherapy regimens. Patients received one of the following chemotherapy regimens at the discretion of the investigator: paclitaxel (80 mg/m² on days 1, 8, 15 and 22 every 4 weeks; pegylated liposomal doxorubicin 40 mg/m² on day 1 every 4 weeks; or topotecan 4 mg/m² on days 1, 8 and 15 every 4 weeks or 1.25 mg/m² on days 1-5 every 3 weeks). Patients were treated until disease progression, unacceptable toxicity, or withdrawal. Forty percent of patients on the chemotherapy alone arm received Avastin alone upon progression. The main outcome measure was investigator-assessed PFS. Secondary outcome measures were ORR and OS.
The median age was 61 years (25 to 84 years) and 37% of patients were ≥65 years. Seventy-nine percent had measurable disease at baseline, 87% had baseline CA-125 levels ≥2 times ULN and 31% had ascites at baseline. Seventy-three percent had a PFI of 3 months to 6 months and 27% had PFI of <3 months. ECOG performance status was 0 for 59%, 1 for 34% and 2 for 7% of the patients.
The addition of Avastin to chemotherapy demonstrated a statistically significant improvement in investigator-assessed PFS, which was supported by a retrospective independent review analysis. Results for the ITT population are presented in Table 16 and Figure 7. Results for the separate chemotherapy cohorts are presented in Table 17.
Table 16: Efficacy Results in Study MO22224
| Efficacy Parameter |
Avastin with Chemotherapy
(N=179) |
Chemotherapy
(N=182) |
| Progression-Free Survival per Investigator |
| Median (95% CI), in months |
6.8 (5.6, 7.8) |
3.4 (2.1, 3.8) |
| HR (95% CI)a |
0.38 (0.30, 0.49) |
| p-value b |
<0.0001 |
| Overall Survival |
| Median (95% CI), in months |
16.6 (13.7, 19.0) |
13.3 (11.9, 16.4) |
| HR (95% CI)a |
0.89 (0.69, 1.14) |
| Overall Response Rate |
| Number of Patients with Measurable Disease at Baseline |
142 |
144 |
| Rate, % (95% CI) |
28% (21%, 36%) |
13% (7%, 18%) |
| Duration of Response |
| Median, in months |
9.4 |
5.4 |
a per stratified Cox proportional hazards model
b per stratified log-rank test |
Figure 7: Kaplan-Meier Curves for Investigator-Assessed Progression-Free Survival in Platinum-Resistant Recurrent Epithelial Ovarian, Fallopian Tube, or Primary Peritoneal Cancer in Study MO22224
Table 17: Efficacy Results in Study MO22224 by Chemotherapy
| Efficacy Parameter |
Paclitaxel |
Topotecan |
Pegylated Liposomal Doxorubicin |
Avastin with Chemotherapy
(N=60) |
Chemotherapy
(N=55) |
Avastin with Chemotherapy
(N=57) |
Chemotherapy
(N=63) |
Avastin with Chemotherapy
(N=62) |
Chemotherapy
(N=64) |
| Progression-Free Survival per Investigator |
| Median, in months (95% CI) |
9.6 (7.8, 11.5) |
3.9 (3.5, 5.5) |
6.2 (5.3, 7.6) |
2.1 (1.9, 2.3) |
5.1 (3.9, 6.3) |
3.5 (1.9, 3.9) |
| Hazard ratioa (95% CI) |
0.47 (0.31, 0.72) |
0.24 (0.15, 0.38) |
0.47 (0.32, 0.71) |
| Overall Survival |
| Median, in months (95% CI) |
22.4 (16.7, 26.7) |
13.2 (8.2, 19.7) |
13.8 (11.0, 18.3) |
13.3 (10.4, 18.3) |
13.7 (11.0, 18.3) |
14.1 (9.9, 17.8) |
| Hazard ratio a (95% CI) |
0.64 (0.41, 1.01) |
1.12 (0.73, 1.73) |
0.94 (0.63, 1.42) |
| Overall Response Rate |
| Number of patients with measurable disease at baseline |
45 |
43 |
46 |
50 |
51 |
51 |
| Rate, % (95% CI) |
53 (39, 68) |
30 (17, 44) |
17 (6, 28) |
2 (0, 6) |
16 (6, 26) |
8 (0, 15) |
| Duration of Response |
| Median, in months |
11.6 |
6.8 |
5.2 |
NE |
8.0 |
4.6 |
a per stratified Cox proportional hazards model
NE=Not Estimable |
Platinum-Sensitive Recurrent Epithelial Ovarian, Fallopian Tube, Or Primary Peritoneal Cancer
Study AVF4095g
The safety and efficacy of Avastin were evaluated in a randomized, double-blind, placebo-controlled study [AVF4095g (NCT00434642)] studying Avastin with chemotherapy versus chemotherapy alone in the treatment of patients with platinum-sensitive recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer who have not received prior chemotherapy in the recurrent setting or prior bevacizumab treatment (N=484). Patients were randomized (1:1) to receive Avastin (15 mg/kg day 1) or placebo every 3 weeks with carboplatin (AUC 4, day 1) and gemcitabine (1000 mg/m² on days 1 and 8) a for 6 to 10 cycles followed by Avastin or placebo alone until disease progression or unacceptable toxicity. The main outcome measures were investigator-assessed PFS. Secondary outcome measures were ORR and OS.
The median age was 61 years (28 to 87 years) and 37% of patients were ≥65 years. All patients had measurable disease at baseline, 74% had baseline CA-125 levels >ULN (35 U/mL). The platinum-free interval (PFI) was 6 months to 12 months in 42 % of patients and >12 months in 58% of patients. The ECOG performance status was 0 or 1 for 99.8% of patients.
A statistically significant prolongation in PFS was demonstrated among patients receiving Avastin with chemotherapy compared to those receiving placebo with chemotherapy (Table 18 and Figure 8). Independent radiology review of PFS was consistent with investigator assessment [HR 0.45 (95% CI: 0.35, 0.58)]. OS was not significantly improved with the addition of Avastin to chemotherapy [HR 0.95 (95% CI: 0.77, 1.17)].
Table 18: Efficacy Results in Study AVF4095g
| Efficacy Parameter |
Avastin with Gemcitabine and Carboplatin
(N=242) |
Placebo with Gemcitabine and Carboplatin
(N=242) |
| Progression-Free Survival |
| Median, in months |
12.4 |
8.4 |
| Hazard ratio |
0.46 |
| (95% CI) |
(0.37, 0.58) |
| p-value |
< 0.0001 |
| Overall Response Rate |
| % patients with overall response |
78% |
57% |
| p-value |
< 0.0001 |
Figure 8: Kaplan-Meier Curves for Progression-Free Survival in Platinum-Sensitive Recurrent Epithelial Ovarian, Fallopian Tube, or Primary Peritoneal Cancer in Study AVF4095g
Study GOG-0213
The safety and efficacy of Avastin were evaluated in a randomized, controlled, open-label study [Study GOGÂ0213 (NCT00565851)] of Avastin with chemotherapy versus chemotherapy alone in the treatment of patientswith platinum-sensitive recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer, who have notreceived more than one previous regimen of chemotherapy (N=673). Patients were randomized (1:1) to receive carboplatin (AUC 5) and paclitaxel (175 mg/m² IV over 3 hours) every 3 weeks for 6 to 8 cycles (N=336) orAvastin (15 mg/kg) every 3 weeks with carboplatin (AUC 5) and paclitaxel (175 mg/m² IV over 3 hours) for 6 to 8 cycles followed by Avastin (15 mg/kg every 3 weeks) as a single agent until disease progression orunacceptable toxicity. The main outcome measure was OS. Other outcome measures were investigator-assessed PFS, and ORR.
The median age was 60 years (23 to 85 years) and 33% of patients were ≥ 65 years. Eighty-three percent had measurable disease at baseline and 74% had abnormal CA-125 levels at baseline. Ten percent of patients had received prior bevacizumab. Twenty-six percent had a PFI of 6 months to 12 months and 74% had a PFI of >12 months. GOG performance status was 0 or 1 for 99% of patients.
Results are presented in Table 19 and Figure 9.
Table 19: Efficacy Results in Study GOG-0213
| Efficacy Parameter |
Avastin with Carboplatin and Paclitaxel
(N=337) |
Carboplatin and Paclitaxel
(N=336) |
| Overall Survival |
| Median, in months |
42.6 |
37.3 |
| Hazard ratio (95% CI) (IVRS)a |
0.84 (0.69, 1.01) |
| Hazard ratio (95% CI) (eCRF)b |
0.82 (0.68, 0.996) |
| Progression-Free Survival |
| Median, in months |
13.8 |
10.4 |
| Hazard ratio (95% CI) (IVRS)a |
0.61 (0.51, 0.72) |
| Overall Response Rate |
| Number of patients with measurable disease at baseline |
274 |
286 |
| Rate, % |
213 (78%) |
159 (56%) |
a HR was estimated from Cox proportional hazards models stratified by the duration of treatment free-interval prior to enrolling onto this study per IVRS (interactive voice response system) and secondary surgical debulking status.
b HR was estimated from Cox proportional hazards models stratified by the duration of platinum free-interval prior to enrolling onto this study per eCRF (electronic case report form) and secondary surgical debulking status. |
Figure 9: Kaplan Meier Curves for Overall Survival in Platinum-Sensitive Recurrent Epithelial Ovarian, Fallopian Tube, or Primary Peritoneal Cancer in Study GOG-0213
Hepatocellular Carcinoma
The efficacy of Avastin in combination with atezolizumab was investigated in IMbrave150 (NCT03434379), a multicenter, international, open-label, randomized trial in patients with locally advanced unresectable and/or metastatic hepatocellular carcinoma who have not received prior systemic therapy. Randomization was stratified by geographic region (Asia excluding Japan vs. rest of world), macrovascular invasion and/or extrahepatic spread (presence vs. absence), baseline AFP (<400 vs. ≥400 ng/mL), and by ECOG performance status (0 vs. 1).
A total of 501 patients were randomized (2:1) to receive either atezolizumab as an intravenous infusion of 1200 mg, followed by 15 mg/kg Avastin, on the same day every 3 weeks or sorafenib 400 mg given orally twice daily, until disease progression or unacceptable toxicity. Patients could discontinue either atezolizumab or Avastin (e.g., due to adverse events) and continue on single-agent therapy until disease progression or unacceptable toxicity associated with the single-agent.
The study enrolled patients who were ECOG performance score 0 or 1 and who had not received prior systemic treatment. Patients were required to be evaluated for the presence of varices within 6 months prior to treatment, and were excluded if they had variceal bleeding within 6 months prior to treatment, untreated or incompletely treated varices with bleeding, or high risk of bleeding. Patients with Child-Pugh B or C cirrhosis, moderate or severe ascites; history of hepatic encephalopathy; a history of autoimmune disease; administration of a live, attenuated vaccine within 4 weeks prior to randomization; administration of systemic immunostimulatory agents within 4 weeks or systemic immunosuppressive medications within 2 weeks prior to randomization; or untreated or corticosteroid-dependent brain metastases were excluded. Tumor assessments were performed every 6 weeks for the first 54 weeks and every 9 weeks thereafter.
The demographics and baseline disease characteristics of the study population were balanced between the treatment arms. The median age was 65 years (range: 26 to 88) and 83% of patients were male. The majority of patients were Asian (57%) or White (35%); 40% were from Asia (excluding Japan). Approximately 75% of patients presented with macrovascular invasion and/or extrahepatic spread and 37% had a baseline AFP ≥400 ng/mL. Baseline ECOG performance status was 0 (62%) or 1 (38%). HCC risk factors were Hepatitis B in 48% of patients, Hepatitis C in 22% and 31% of patients had non-viral liver disease. The majority of patients had BCLC stage C (82%) disease at baseline, while 16% had stage B and 3% had stage A.
The major efficacy outcome measures were overall survival (OS) and independent review facility (IRF)Âassessed progression free survival (PFS) per RECIST v1.1. Additional efficacy outcome measures were IRF-assessed overall response rate (ORR) per RECIST and mRECIST.
Efficacy results are presented in Table 20 and Figure 10.
Table 20: Efficacy Results from IMbrave150
|
Avastin in combination with Atezolizumab
(N= 336) |
Sorafenib
(N=165) |
|
Overall Survival |
| Number of deaths (%) |
96 (29) |
65 (39) |
| Median OS in months |
NE |
13.2 |
| (95% CI) |
(NE, NE) |
(10.4, NE) |
| Hazard ratio1 (95% CI) |
0.58 (0.42, 0.79) |
| p-value2 |
0.00062 |
|
Progression-Free Survival3 |
| Number of events(%) |
197 (59) |
109 (66) |
| Median PFS in months (95% CI) |
6.8 (5.8, 8.3) |
4.3 (4.0, 5.6) |
| Hazard ratio1 (95% CI) |
0.59 (0.47, 0.76) |
| p-value |
<0.0001 |
|
Overall Response Rate3,5 (ORR), RECIST 1.1 |
| Number of responders (%) |
93 (28) |
19 (12) |
| (95% CI) |
(23, 33) |
(7,17) |
| p-value4 |
<0.0001 |
| Complete responses, n (%) |
22 (7) |
0 |
| Partial responses, n (%) |
71 (21) |
19 (12) |
|
Duration of Response3,5 (DOR) RECIST 1.1 |
|
(n=93) |
(n=19) |
| Median DOR in months |
NE |
6.3 |
| (95% CI) |
(NE, NE) |
(4.7, NE) |
| Range (months) |
(1.3+, 13.4+) |
(1.4+, 9.1+) |
|
Overall Response Rate3,5 (ORR), HCC mRECIST |
| Number of responders (%) |
112 (33) |
21 (13) |
| (95% CI) |
(28, 39) |
(8, 19) |
| p-value4 |
<0.0001 |
| Complete responses, n (%) |
37 (11) |
3 (1.8) |
| Partial responses, n (%) |
75 (22) |
18 (11) |
|
Duration of Response3,5 (DOR) HCC mRECIST |
|
(n=112) |
(n=21) |
| Median DOR in months |
NE |
6.3 |
| (95% CI) |
(NE, NE) |
(4.9, NE) |
| Range (months) |
(1.3+, 13.4+) |
(1.4+, 9.1+) |
CI=confidence interval; HCC mRECIST= Modified RECIST Assessment for Hepatocellular Carcinoma; NE=not estimable; N/A=not applicable; RECIST 1.1= Response Evaluation Criteria in Solid Tumors v1.1
1 Stratified by geographic region (Asia excluding Japan vs. rest of world), macrovascular invasion and/or extrahepatic spread (presence vs. absence), and baseline AFP (<400 vs. ≥400 ng/mL)
2 Based on two-sided stratified log-rank test; as compared to significance level 0.004 (2-sided) based on 161/312=52% information using the OBF method
3 Per independent radiology review
4 Based on two-sided Cochran-Mantel-Haesnszel test
5 Confirmed responses
+ Denotes a censored value |
Figure 10: Kaplan-Meier Plot of Overall Survival in IMbrave150