Shire plc (LON:SHP,) and Shire Pharma Canada ULC (Shire Canada), the leading global biotechnology company focused on rare diseases, today announced that following priority review, Health Canada has authorized TAKHZYRO (lanadelumab injection) for routine prevention of attacks of hereditary angioedema (HAE) in adolescents and adults (12 years of age and older). HAE is a rare, genetic and potentially life-threatening disorder that can result in recurrent attacks of edema (swelling) in various parts of the body. HAE attacks can happen spontaneously at any time and can be debilitating and painful.
“The burden HAE patients and their families face every day can’t be ignored,” said Jacquie Badiou, President, HAE Canada. “Our National Report Card shows that the unpredictable nature of this life-threatening disorder, not knowing when the next attack will come, has a negative impact on their lives and the lives of their loved ones. This new treatment option is great news as it was shown to significantly reduce the frequency of attacks.”
TAKHZYRO is a fully human monoclonal antibody that inhibits the activity of plasma kallikrein, an enzyme which is uncontrolled in people with HAE, to prevent attacks. The recommended dose of TAKHZYRO is 300 mg every 2 weeks. A dosing interval of 300 mg every 4 weeks may be considered if the patient is well-controlled (e.g., attack free) for more than 6 months.
Health Canada’s authorization of TAKHZYRO for the routine prevention of HAE attacks in adolescents and adults is supported by results of the Phase III HELP (Hereditary Angioedema Long-term Prophylaxis) Study, in which the primary efficacy endpoint was the number of investigator-confirmed HAE attacks during the 26-week study duration. The HELP study demonstrated that TAKHZYRO reduced the number of monthly HAE attacks by an average of 87 per cent (n=27) vs. placebo (n=41) when administered at 300 mg every two weeks and 73 per cent (n=29) vs. placebo (n=41) when administered at 300 mg every four weeks (P<0.001).
In the 26-week clinical study, which enrolled 125 patients with HAE with CI inhibitor deficiency, secondary endpoints included: the number of attacks requiring acute treatment and the number of attacks assessed as moderate or severe. Patients taking TAKHZYRO 300 mg every two weeks had 87 per cent fewer attacks that required on-demand treatment and 83 per cent fewer moderate to severe attacks. A pre-specified, exploratory analysis showed that 44 per cent of patients (n=27) receiving TAKHZYRO 300 mg every two weeks had zero attacks compared to placebo (2 per cent, n=41) for the 26-week treatment period.
Of the patients who received TAKHZYRO and completed the HELP Study, the largest prevention study conducted to date in HAE, 97 per cent enrolled in an ongoing open-label extension study designed to evaluate the long-term safety and efficacy of TAKHZYRO. In the extension study, after receiving a single dose of TAKHZYRO 300 mg at study entry, 80 per cent of patients who had been in the 300 mg every two weeks treatment group (n=25) in the HELP Study remained attack-free at week 4 post-dose.
The most common side effects seen with TAKHZYRO were injection site reactions including pain, redness, and bruising.
“As a physician who treats patients with HAE, I am pleased to have a treatment like TAKHZYRO available for the prevention of HAE attacks,” said Dr. Stephen D Betschel. “The HAE community has a new option that can help prevent attacks.”
TAKHZYRO has a half-life of approximately 14 days and can be self-administered every two or four weeks as one subcutaneous injection. In the HELP Study extension the majority of self-injections took one minute or less to complete.
“This authorization reinforces our ongoing commitment to develop innovative therapies that can help make a positive impact on patients,” said Eric Tse, General Manager, Shire Canada. “We will continue to work towards our goal of improving the lives of those living with rare diseases, including HAE.”
TAKHZYRO was approved in the U.S. on August 23, 2018 for prophylaxis to prevent attacks of hereditary angioedema (HAE) in patients 12 years of age and older. Additional regulatory submissions are ongoing worldwide.
About The HELP Study
The HELP Study was a global, multicentre, randomized, double-blind placebo-controlled parallel group trial that evaluated the efficacy and safety of subcutaneously administered TAKHZYRO vs. placebo over 26 weeks in 125 patients 12 years of age or older with HAE.
The primary endpoint was the number of investigator-confirmed HAE attacks over the entire 26-week study duration. TAKHZYRO demonstrated that subcutaneous injections every two or four weeks reduced the mean monthly number of attacks across all three TAKHZYRO treatment arms studied: 300 mg every two weeks, 300 mg every four weeks, and 150 mg of TAKHZYRO every four weeks. At 300 mg every two weeks, TAKHZYRO reduced the number of mean monthly HAE attacks by 87 per cent vs. placebo (P<0.001).
Secondary endpoints included: 1) number of attacks requiring acute treatment, 2) number of attacks assessed as moderate or severe and 3) number of attacks from days 14-182. Overall, each TAKHZYRO treatment arm demonstrated statistically significant attack rate reductions compared with placebo for all secondary efficacy endpoints (adjusted P<0.001 for all comparisons), including: attacks requiring acute treatment (74 per cent to 87 per cent) and moderate or severe attacks (70 per cent to 83 per cent).
The HELP Study Extension
The long-term safety and efficacy of TAKHZYRO for the prevention of HAE attacks continues to be evaluated in an open-label extension study.
In the extension study, 212 adolescent and adult patients received at least one dose of TAKHZYRO. Of these, 109 patients are rollover participants from the HELP Study and 103 are new (non-rollover) participants who had a historical baseline attack rate of >1 attack per 12 weeks and a confirmed diagnosis of HAE.
About Hereditary Angioedema
HAE is a rare, genetic disorder estimated to affect about 1 in 10,000 to 1 in 50,000 people worldwide. Around 900 HAE patients are estimated to be in Canada. The condition results in recurring attacks of edema (swelling) in various parts of the body that can be debilitating and painful. Laryngeal attacks that obstruct the airways are potentially life-threatening due to the risk of asphyxiation. Aside from the burden of the disease itself, patients can suffer anxiety, fatigue and depression between attacks.
About TAKHZYRO (lanadelumab injection)
TAKHZYRO (lanadelumab injection) is indicated for routine prevention of attacks of hereditary angioedema (HAE) in adolescents and adults (12 years of age and older).
TAKHZYRO is not intended for acute treatment of HAE attacks. Patients and caregivers should continue to be prepared to treat attacks with acute HAE treatments when necessary.
TAKHZYRO is a fully human monoclonal antibody that specifically binds and inhibits plasma kallikrein activity and is indicated for the prevention of HAE attacks in patients 12 years and older. TAKHZYRO is formulated for subcutaneous administration and has a half-life of approximately two weeks in patients with HAE. TAKHZYRO is intended for self-administration or administration by a caregiver. The patient or caregiver should be trained by a healthcare professional.
It is not known if TAKHZYRO is safe and effective in children under 12 years of age.