Helen Thackray
Analyst · Piper Sandler
Thanks Charlie. Today, I'll discuss a few significant updates on our pipeline programs, including progress with our current molecules and our future goals for advancing multiple new drug candidates to treat complement-mediated diseases. As we continue to advance our pipeline, an important goal, which we believe is achievable, is to bring novel orally delivered products forward to treat many complement-mediated diseases. Our vision is to be the global leader in delivering medications targeting dysfunction across the complement system. What's new at BioCryst today is some important progress we've made towards that vision. We have expanded our Factor D inhibitor program towards targeting the alternative pathway with a second potentially best-in-class molecule in the clinic. And we've identified several additional targets where there is potential for oral drugs to address the other major pathways of the complement system. Our discovery team has already made progress towards generating molecules for each of these targets, giving us confidence that our unique discovery platform has the capability to produce oral drugs for these challenging targets. If successful, this would multiply our opportunities to treat diseases mediated by dysregulation of the complement cascade. So, in total, we are not only adding a second oral Factor D inhibitor to our portfolio for the alternative pathway, but also building the potential for multiple additional oral drugs to address diseases across the complement system, including those with the classical pathway, lectin pathway, and terminal pathway. We intend to invest in the development of a number of oral medicines for these targets. If we are successful in delivering oral treatments for more than one pathway in the complement system, imagine also the possibility of addressing several pathways at once with combined oral drugs. This could expand treatment opportunities even further with monotherapy, single pathway approaches, and with combination multiple pathway approaches for treatment of the most complex or serious diseases. Now, I'll go into some of the specifics, illustrating why we believe we can deliver both the first and then a best-in-class oral monotherapy Factor D inhibitor for our program targeting the alternative pathway. Overall, the goals of this program are twofold; one, to quickly bring a first molecule to market, putting BioCryst in a position to deliver the first safe and effective oral monotherapy Factor D inhibitor to patients across multiple complement-mediated diseases. BCX9930 has the potential to achieve this, and our near-term focus is on assessing swiftly and efficiently whether we have successfully identified a safe and effective dose regimen that will keep our REDEEM pivotal trial in PNH on a path to registration. And two, to continue to produce an advanced unique new molecules to achieve best-in-class outcomes for patients. By this, we mean molecules that bring some combination of improved potency improved safety, or with longer exposure at therapeutic levels with oral delivery. And even more specifically, we mean a therapy that is differentiated in the field by delivering a safe and effective therapy in a once-daily dose. We did this with ORLADEYO, and we believe we can do it again. With BCX9930, we've made steady progress towards reinitiating enrollment with the pivotal program. We've begun screening new patients for enrollment in the REDEEM trials and are gaining some initial experience at the lower dose in patients already on our studies. You will remember that we amended the REDEEM and RENEW protocols with a new dosing regimen of 400 milligrams twice daily with a brief step up at the start of dosing in our effort to confirm a safe and effective dose for BCX9930. Our hypothesis is that this new dosing regimen, together with attention to simple hydration, may prevent the rise in serum creatinine observed in some patients previously at 500 milligrams twice daily. All patients who continue on BCX9930 have been switched from 500 milligrams to a lower dose. At this point, and with initial and limited experience, it is too early to draw any conclusions about the success of these steps. Of course, if we observe something that warrants holding or discontinuing the program, we will update you earlier as that occurs. Otherwise, our plan is to bring an update mid-2023 with more robust data from approximately 15 newly enrolled patients. If the new dosing regimen resolves the observations of renal injury, our plan would be to invest fully in the pivotal program and bring BCX9930 to market as quickly as possible. And if this is not demonstrated, we will discontinue the program. In addition, as I mentioned earlier, we are also advancing BCX-10013 as the second unique molecule with the potential to be a differentiated product for the proximal alternative pathway of complement with once-daily dosing. BCX10013 has been moving at full speed for some time and as a result is already in the clinic. We are reporting today that BCX10013 is being as best in healthy therapeutic dose levels with single ascending doses and multiple ascending doses. Approximately 90 healthy volunteers have been dosed with BCX10013 at this point. and so far, we have observed an initial safety, tolerability and PK profile that's not only support of advancing into evaluation in patients, but also looks promising for once-daily dosing. Our plan is to initiate patient studies to confirm the best dose level for advancement into a registration program. We'll have more to share with you about the data and the plan for this program in first quarter 2023. Finally, another pipeline update, I'll turn to BCX9250 and FOP. Here, the competitive landscape for the ultra-rare disease -- this ultra-rare disease is increasingly crowded, including with several late-stage programs assessing the same mechanism of action for the treatment of this disease of BCX9250, that of ALK-2 inhibition. We have concluded that it's increasingly likely the needs of patients here may be served by other products before BCX9250 can achieve registration. We are, therefore, discontinuing development of BCX9250 and redirecting the investment of this program towards our many opportunities and complements. To conclude today's update on our pipeline, I'll repeat a theme you've heard from us before. We have succeeded with delivering orally administrated -- orally administered small molecules for challenging targets. This capability gives us very high confidence that we can achieve our goal discussed today to deliver oral drugs across multiple very difficult targets in the complement system. Now I'll pass it to Anthony.