On December 3, 2018 Genentech, a member of the Roche Group (SIX: RO, ROG; OTCQX: RHHBY), announced today data from the primary analysis of the Phase III HAVEN 2 study evaluating Hemlibra (emicizumab-kxwh) prophylaxis in children younger than 12 years of age with hemophilia A with factor VIII inhibitors, including longer follow-up for once-weekly dosing and new data for less frequent dosing schedules (every two weeks or every four weeks) (Press release, Genentech, DEC 3, 2018, View Source [SID1234531845]). These data from the largest pivotal study in children with hemophilia A with factor VIII inhibitors were presented at the 60th American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting.
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"Children with inhibitors are at increased risk of life-threatening bleeds and may experience frequent, repeated bleeding into joints," said Guy Young, M.D., director of Hemostasis and Thrombosis Center, Children’s Hospital Los Angeles, and professor of Pediatrics, University of Southern California Keck School of Medicine, Los Angeles, California. "These updated data from HAVEN 2 showed that the majority of children with hemophilia A with factor VIII inhibitors treated with emicizumab-kxwh had zero treated bleeds across three different dosing schedules, reinforcing the ability of this medicine to provide sustained, effective bleed control."
In updated results from the HAVEN 2 study with a median of 11 additional months of data, 76.9 percent (95 percent CI: 64.8; 86.5) of children with hemophilia A with factor VIII inhibitors treated with Hemlibra once weekly (n=65) experienced zero treated bleeds. Importantly, once-weekly Hemlibra showed a 99 percent (95 percent CI: 97.7; 99.4) reduction in treated bleeds compared to prior treatment with bypassing agents (BPAs) as prophylaxis (n=15) or on-demand (n=3) in a prospective intra-patient comparison. New data also showed that 90 percent (95 percent CI: 55.5; 99.7) of children with factor VIII inhibitors receiving Hemlibra every two weeks (n=10) and 60 percent (95 percent CI: 26.2; 87.8) of children receiving Hemlibra every four weeks (n=10) experienced zero treated bleeds, demonstrating clinically meaningful bleed control at both dosing schedules. No cases of thrombotic microangiopathy (TMA) or thrombotic events occurred. The most common adverse events (AEs) in the HAVEN 2 study primary analysis were consistent with those previously observed in the interim analyses.
"The updated analysis from the HAVEN 2 study supports the potential of Hemlibra to control bleeds at less frequent subcutaneous dosing, providing parents and their children more flexibility to choose a treatment schedule that is right for them," said Sandra Horning, M.D., chief medical officer and head of Global Product Development. "Many children with hemophilia A with factor VIII inhibitors have already experienced the benefits of Hemlibra, and with these new positive data, we are confident that this treatment will continue to make a meaningful difference in their lives."
Hemlibra is approved in over 50 countries worldwide, including the U.S., EU member states and Japan, to treat people of all ages with hemophilia A with factor VIII inhibitors based on pivotal data that included interim results from the HAVEN 2 study. In October 2018, the U.S. Food and Drug Administration (FDA) also approved Hemlibra to treat people of all ages with hemophilia A without factor VIII inhibitors. Hemlibra is the only FDA-approved treatment for people with hemophilia A with and without factor VIII inhibitors that can be administered subcutaneously (under the skin) and at multiple dosing options (once weekly, every two weeks or every four weeks). Submissions to other regulatory authorities around the world are ongoing.
Hemlibra has been studied in one of the largest pivotal clinical trial programs in people with hemophilia A with and without factor VIII inhibitors, including four Phase III HAVEN studies (HAVEN 1, HAVEN 2, HAVEN 3 and HAVEN 4).
About HAVEN 2 (NCT02795767)
HAVEN 2 is a multicenter, open-label, clinical study in children younger than 12 years of age with hemophilia A with factor VIII inhibitors. The study is evaluating the efficacy, safety and pharmacokinetics of once-weekly, every two weeks or every four weeks subcutaneous administration of Hemlibra prophylaxis.
The HAVEN 2 primary analysis included 85 children (once-weekly dosing, n=65; every two week dosing, n=10; every four week dosing, n=10) with hemophilia A with factor VIII inhibitors. The median follow-up period for each cohort was 58 (range 17.9–92.6), 21.3 (range 18.6–24.1), and 19.9 (range 8.9–24.1) weeks, respectively. The prospective intra-patient comparison included 18 patients from the once-weekly cohort previously treated with BPAs either as prophylaxis (n=15) or on-demand (n=3) as part of a non-interventional study.
The study met its primary endpoint and key secondary endpoints. Data presented at the 60th ASH (Free ASH Whitepaper) Annual Meeting showed:
HAVEN 2 (NCT02795767)
Hemlibra prophylaxis 1.5 mg/kg QW
(Arm A; n=65)*
Annualized bleeding rate [ABR] †
(95% CI)
Median ABR
(Interquartile range; IQR)
Treated bleeds (primary endpoint)**
0.3
(0.17; 0.50)
0.0
(0.00; 0.00)
All bleeds
3.2
(1.94; 5.22)
0.6
(0.00; 2.92)
Treated spontaneous bleeds
0.0
(0.01; 0.10)
0.0
(0.00; 0.00)
Treated joint bleeds
0.2
(0.08; 0.29)
0.0
(0.00; 0.00)
Treated target joint bleeds
Not estimable
0.0
(0.00; 0.00)
*Efficacy assessment was conducted only in patients aged <12 years who had spent at least 12 weeks on the study. Excludes three patients aged >12 years.
A loading dose of 3 mg/kg Hemlibra was given for four weeks followed by the maintenance dose listed.
† Estimated using negative binomial regression
**In patients receiving Hemlibra once weekly (Arm A), 76.9% (95% CI, 64.8; 86.5) experienced zero treated bleeds and 23.1% experienced 1–3 treated bleeds.
Hemlibra prophylaxis 3 mg/kg
Q2W
(Arm B; n=10)*
Hemlibra prophylaxis 6 mg/kg
Q4W
(Arm C; n=10)*
ABR (95% CI) †
0.2
(0.03; 1.72)
2.2
(0.69; 6.81)
Median ABR (IQR)
0.0
(0.00; 0.00)
0.0
(0.00; 3.26)
% patients with zero treated
bleeds
(95% CI)
90.0%
(55.5; 99.7)
60.0%
(26.2; 87.8)
% patients with 1-3 treated
bleeds
(95% CI)
10.0%
(0.3; 44.5)
40.0%
(12.2; 73.8)
*A loading dose of 3 mg/kg Hemlibra was given for four weeks followed by the maintenance dose listed.
† Estimated using negative binomial regression
The most common adverse reactions occurring in 10 percent or more of children treated with Hemlibra were common cold symptoms (nasopharyngitis; 37.5 percent), injection site reactions (29.5 percent), fever (pyrexia; 23.9 percent), upper respiratory tract infection (23.9 percent), cough (23.9 percent), diarrhea (15.9 percent), vomiting (15.9 percent), headache (14.8 percent), contusion (12.5 percent), fall (12.5 percent) and influenza (10.2 percent). No cases of TMA or thrombotic events occurred. Four patients tested positive for anti-drug antibodies (ADAs) to Hemlibra. Of these patients, two had ADAs with neutralizing potential based on reduced Hemlibra levels. As previously reported, the ADA in one of these patients resulted in reduced efficacy of Hemlibra and led to discontinuation of treatment. The other patient had no bleeds as of the clinical cut-off date of the study.
About Hemlibra
Hemlibra is a bispecific factor IXa- and factor X-directed antibody. It is designed to bring together factor IXa and factor X, proteins required to activate the natural coagulation cascade and restore the blood clotting process for hemophilia A patients. Hemlibra is a prophylactic (preventative) treatment that can be administered by an injection of a ready-to-use solution under the skin (subcutaneously) once weekly, every two weeks or every four weeks. Hemlibra was created by Chugai Pharmaceutical Co., Ltd. and is being co-developed globally by Chugai, Roche and Genentech.
Hemlibra U.S. Indication
Hemlibra is a prescription medicine used for routine prophylaxis to prevent or reduce the frequency of bleeding episodes in adults and children, ages newborn and older, with hemophilia A with or without factor VIII inhibitors.
Important Safety Information
What is the most important information to know about Hemlibra?
Hemlibra increases the potential for blood to clot. Patients should carefully follow their healthcare provider’s instructions regarding when to use an on-demand bypassing agent or factor VIII, and the dose and schedule to use for breakthrough bleed treatment. Hemlibra may cause the following serious side effects when used with activated prothrombin complex concentrate (aPCC; FEIBA), including:
Thrombotic microangiopathy (TMA). This is a condition involving blood clots and injury to small blood vessels that may cause harm to one’s kidneys, brain, and other organs. Patients should get medical help right away if they have any of the following signs or symptoms during or after treatment with Hemlibra:
confusion
weakness
swelling of arms and legs
yellowing of skin and eyes
stomach (abdomen) or back pain
nausea or vomiting
feeling sick
decreased urination
Blood clots (thrombotic events). Blood clots may form in blood vessels in the arm, leg, lung, or head. Patients should get medical help right away if they have any of these signs or symptoms of blood clots during or after treatment with Hemlibra:
swelling in arms or legs
pain or redness in the arms or legs
shortness of breath
chest pain or tightness
fast heart rate
cough up blood
feel faint
headache
numbness in the face
eye pain or swelling
trouble seeing
If aPCC (FEIBA) is needed, patients should talk to their healthcare provider in case they feel they need more than 100 U/kg of aPCC (FEIBA) total.
Before using Hemlibra, patients should tell their healthcare provider about all of their medical conditions, including if they:
are pregnant or plan to become pregnant. It is not known if Hemlibra may harm an unborn baby. Females who are able to become pregnant should use birth control (contraception) during treatment with Hemlibra.
are breastfeeding or plan to breastfeed. It is not known if Hemlibra passes into breast milk.
Patients should tell their healthcare provider about all the medicines they take, including prescription medicines, over-the-counter medicines, vitamins, or herbal supplements. Patients should keep a list of them to show their healthcare provider and pharmacist when they get a new medicine.
How should patients use Hemlibra?
Patients should see the detailed "Instructions for Use" that comes with Hemlibra for information on how to prepare and inject a dose of Hemlibra, and how to properly throw away (dispose of) used needles and syringes.
Stop (discontinue) prophylactic use of bypassing agents the day before starting Hemlibra prophylaxis.
Patients may continue prophylactic use of factor VIII for the first week of Hemlibra prophylaxis.
What should patients know about lab monitoring?
Hemlibra may interfere with laboratory tests that measure how well blood is clotting and may cause a false reading. Patients should talk to their healthcare provider about how this may affect their care.
The most common side effects of Hemlibra include: redness, tenderness, warmth, or itching at the site of injection; headache; and joint pain.
These are not all of the possible side effects of Hemlibra. Patients should speak to their healthcare provider for medical advice about side effects.
Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Patients should not use Hemlibra for a condition for which it was not prescribed. Patients should not give Hemlibra to other people, even if they have the same symptoms that they have. It may harm them. Patients can ask their pharmacist or healthcare provider for information about Hemlibra that is written for health professionals.
Side effects may be reported to the FDA at (800) FDA-1088 or View Source Side effects may also be reported to Genentech at (888) 835-2555.
Please see the Hemlibra full Prescribing Information and Medication Guide for more important safety information including Serious Side Effects.
About hemophilia A
Hemophilia A is an inherited, serious disorder in which a person’s blood does not clot properly, leading to uncontrolled and often spontaneous bleeding. Hemophilia affects around 20,000 people in the United States, with hemophilia A being the most common form and approximately 50-60 percent of people living with a severe form of the disorder.
People with hemophilia A either lack or do not have enough of a clotting protein called factor VIII. In a healthy person, when a bleed occurs, factor VIII brings together the clotting factors IXa and X, which is a critical step in the formation of a blood clot to help stop bleeding. Depending on the severity of their disorder, people with hemophilia A can bleed frequently, especially into their joints or muscles. These bleeds can present a significant health concern as they often cause pain and can lead to chronic swelling, deformity, reduced mobility and long-term joint damage.
A serious complication of treatment is the development of inhibitors to factor VIII replacement therapies. Inhibitors are antibodies developed by the body’s immune system that bind to and block the efficacy of replacement factor VIII, making it difficult, if not impossible, to obtain a level of factor VIII sufficient to control bleeding.