Is it time to FACTOR UP your hemophilia A management?

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Living with hemophilia A often means learning to live with unknowns—painful bleeds that can happen without warning, not knowing when a bleed might interrupt your plans, or when juggling treatment needs interrupts juggling, well, life itself.

But recent treatments may be able to change some of that—like ALTUVIIIO [antihemophilic factor (recombinant), Fc-VWF-XTEN fusion protein-ehtl]. In 2023, Sanofi received FDA approval for ALTUVIIIO, a first-in-class Factor VIII replacement therapy that provides proven bleed protection for longer with once-weekly prophylaxis.

Here are 4 reasons to consider ALTUVIIIO:


ALTUVIIIO is engineered to last longer. With just one weekly infusion, Factor VIII levels remain in the near-normal to normal range (over 40%) for most of the week and stay above 18%,* on average, in adults.

*Average trough levels were 18% for adults 18 years and older, 9% for adolescents aged 12 years to under 18 years, 10% for children aged 6 years to under 12 years, and 7% for children aged 1 year to under 6 years.

†This is information from a study in 13 previously treated adults with severe hemophilia A that had the goal of comparing how long ALTUVIIIO, Adynovate® [Antihemophilic Factor (Recombinant), PEGylated], and Advate® [Antihemophilic Factor (Recombinant)] stayed in the body after 1 dose. Half-life was 43 hours for ALTUVIIIO, 15 hours for Adynovate, and 11 hours for Advate.
Adynovate and Advate are registered trademarks of Baxalta Incorporated, a Takeda company.
EHL=extended half-life; SHL=standard half-life.

ALTUVIIIO can be used not only for weekly prophylaxis but also for on-demand bleed control and perioperative management. Regardless of how you use it, you can expect the same infusion process


 Before we dive into the data, it’s helpful to know how ALTUVIIIO was studied and to understand its safety profile.

For one year, the XTEND-1 study looked at treatment in 159 adults and adolescents. Participants were divided into 2 groups. Both groups used mean and median annualized bleed rates (ABRs) to evaluate the efficacy of ALTUVIIIO. Finding people’s mean ABR was the primary goal of the study.

Safety evaluated in 159 people taking ALTUVIIIO in the XTEND-1 study showed that:

  • 21% of people had headache (33 people)
  • 16% of people had joint pain (26 people)
  • 6% of people had back pain (9 people)

ALTUVIIIO was also studied in the XTEND-Kids trial, in 67 previously treated male children under the age of 12. These children all received at least 1 dose of ALTUVIIIO.

In 67 children taking ALTUVIIIO in the XTEND-Kids study at the time of the interim analysis:

  • 1% of children had headache (1 child)

In XTEND-1 and XTEND-Kids, people taking ALTUVIIIO had:

  • 0 inhibitors
  • 0 serious allergic reactions

Although no inhibitors were found, and no serious allergic reactions occurred in clinical studies, inhibitors and serious allergic reactions are possible with ALTUVIIIO.

Group 1

This group consisted of 133 people aged 12 years and older who switched to once-weekly ALTUVIIIO prophylaxis from prior prophylaxis. This group included 1 female participant. Efficacy of prophylaxis was evaluated in 128 of these patients.

The primary outcome showed a mean of <1 (0.7) bleeds per year (the median ABR was 0). Here’s a look at how the study measured bleed rates:

  • Median ABR was the middle number of all ABRs, when ABRs were ordered from least to greatest
  • Mean ABR was the average number based on everyone’s ABRs

In the pediatric study, routine prophylaxis with ALTUVIIIO resulted in a mean ABR of 0.5 and a median ABR of 0.

It’s also worth noting that 78 of the people in Group 1 participated in a separate study to measure their ABRs on their prior prophylaxis. These 78 people went from 3 bleeds to less than 1 bleed a year (mean ABR 0.7). That’s a powerful reduction of 77% in yearly bleeds!

And, over the 52 weeks on ALTUVIIIO prophylaxis, 64% of people had 0 bleeds.

Group 2

People in this group (26 participants) switched from prior on-demand therapy to ALTUVIIIO on demand for 26 weeks, and then to ALTUVIIIO prophylaxis for another 26 weeks.

This group also saw striking results. On average, people who switched from ALTUVIIIO on demand to ALTUVIIIO prophylaxis went from 21 bleeds to less than 1 bleed a year (mean ABR 0.7). That’s a 97% mean reduction in yearly bleeds.

And over the 26 weeks on ALTUVIIIO prophylaxis, 77% of people had 0 bleeds.

Both groups showed significant improvement in bleed protection with ALTUVIIIO prophylaxis.

Data based on treated bleeds.


The XTEND-1 study also examined target joint bleeds. When evaluating joint results at 52 weeks in the 128 people who participated in the XTEND-1 study, 72% of people had 0 joint bleeds on prophylaxis after switching to ALTUVIIIO. 100% of target joints were resolved.

Target joints:

  • Are 3 or more spontaneous bleeds in a major joint within a period of 6 consecutive months
  • Were considered resolved if 2 or fewer bleeds occurred in the target joint within 12 months

‡Data based on treated bleeds.


While most people with hemophilia grow accustomed to infusing, fewer infusions are generally preferred. In studies, ALTUVIIIO clearly outlasted other Factor VIII replacement therapies, meaning ALTUVIIIO takes longer to be reduced by half in the body and therefore lasts for a longer period.

So instead of needing up to 4 infusions a week with other treatments, patients on ALTUVIIIO infused only once per week.

ALTUVIIIO offers the fewest weekly infusions among Factor VIII prophylaxis treatments.

§This is information from a study in 13 previously treated adults with severe hemophilia A that had the goal of comparing how long ALTUVIIIO, Adynovate® [Antihemophilic Factor (Recombinant), PEGylated], and Advate®[Antihemophilic Factor (Recombinant)] stayed in the body after 1 dose. Half-life was 43 hours for ALTUVIIIO, 15 hours for Adynovate, and 11 hours for Advate.
||Doses and dosing intervals may be adjusted.
Adynovate and Advate are registered trademarks of Baxalta Incorporated, a Takeda company.

Hear from other people living with hemophilia A who have made the switch.

Now that you’ve learned about how ALTUVIIIO can keep factor levels higher for longer and protect you from bleeds, you may be considering a conversation with your doctor about switching up your treatment plan. Our Evaluation Guide can help. It offers a list of helpful questions to help you jump-start the conversation. You can also connect with your local Sanofi Community Relations and Education (CoRe) Manager, who can share additional resources and provide education.


ALTUVIIIO® [antihemophilic factor (recombinant), Fc-VWF-XTEN fusion protein-ehtl] is an injectable medicine that is used to control and reduce the number of bleeding episodes in people with hemophilia A (congenital Factor VIII deficiency).

Your healthcare provider may give you ALTUVIIIO when you have surgery.


What is the most important information I need to know about ALTUVIIIO?

Do not attempt to give yourself an injection unless you have been taught how by your healthcare provider or hemophilia center. You must carefully follow your healthcare provider’s instructions regarding the dose and schedule for injecting ALTUVIIIO so that your treatment will work best for you.

Who should not use ALTUVIIIO?

You should not use ALTUVIIIO if you have had an allergic reaction to it in the past.

What should I tell my healthcare provider before using ALTUVIIIO?

Tell your healthcare provider if you have had any medical problems, take any medications, including prescription and non-prescription medicines, supplements, or herbal medicines, are breastfeeding, or are pregnant or planning to become pregnant.

What are the possible side effects of ALTUVIIIO?

You can have an allergic reaction to ALTUVIIIO. Call your healthcare provider or emergency department right away if you have any of the following symptoms: difficulty breathing, chest tightness, swelling of the face, rash, or hives.

Your body can also make antibodies called “inhibitors” against ALTUVIIIO. This can stop ALTUVIIIO from working properly. Your healthcare provider may give you blood tests to check for inhibitors.

The common side effects of ALTUVIIIO are headache, joint pain, and back pain.

These are not the only possible side effects of ALTUVIIIO. Tell your healthcare provider about any side effect that bothers you or does not go away.

Please see full Prescribing Information.


©2024 Genzyme Corporation. All rights reserved.
ALTUVIIIO and Sanofi are registered trademarks of Sanofi or an affiliate.

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