Rick Winningham
Analyst · H.C. Wainwright
Good afternoon, and welcome to Theravance Biopharma's First Quarter 2024 Earnings Results conference call. On Slide 2, you'll find our safe harbor language. And I'd remind everyone that our call today will include forward-looking statements involving risks and uncertainties pertaining to our development pipeline, expected benefits of our product candidate, anticipated timing of clinical trials, regulatory filings and expected financial results. Information concerning factors that could cause results to differ materially from our forward-looking statements is described further in our filings with the SEC.
Now please turn to Slide 3. Because joining me today -- joining me on the call today are Aine Miller, our Head of Development; Rhonda Farnum, Theravance's Chief Business Officer; and Aziz Sawaf, our Chief Financial Officer.
Next, on Slide 4, I'll begin with a recap of our first quarter highlights before turning the call over to the rest of the team. As you can see on the left side of the slide, we've made good commercial progress with YUPELRI during the quarter, achieving $55.2 million in net sales in partnership with Viatris. This translates into 18% year-on-year growth. Our team at Theravance got off to a terrific start this year in the hospital setting, again, achieving another all-time high in terms of hospital doses sold in the quarter, up 31% from the prior year.
In addition, we continue to expect our partners at Viatris to complete a regulatory filing for YUPELRI in China by midyear based on the strong Phase III results announced last November.
Turning to Ampreloxetine. In the middle of the slide, we're very excited to be hosting a dedicated virtual investor event on May 23 and at 10:00 a.m. Eastern. We're two thought leaders in the field of autonomic dysfunction as well as our team at Theravance will discuss the compelling science behind ampreloxetine's opportunity to address the unmet need in nOH and MSA patients.
We continue to work diligently to complete the registrational Phase III CYPRESS study with the last patient planned to be enrolled in the second half of this year. As well as put in place the regulatory and commercial framework that will enable Theravance to make ampreloxetine available quickly and broadly should CYPRESS be successful.
Finally, we delivered another strong order of financial performance, driven in equal parts by good YUPELRI growth and expense management. Despite experiencing some seasonal transitioning from quarter 4 to quarter 1, which is typical of the pharmaceutical business, we realized a limited cash burn ending the period with $100 million in cash and no debt. As Aziz will discuss later, TRELEGY turned in a fantastic performance which makes us increasingly optimistic for the value that, that product stands to deliver to Theravance shareholders in the future.
Turning to Slide 5, I'll briefly touch on how our strategic imperatives position Theravance to deliver compelling value to shareholders over both the near and the long term. We have a detailed plan in place to continue YUPELRI's growth for the foreseeable future while still delivering on expanded profitability and cash returns to the company.
Over the past 12 months, U.S. YUPELRI sales have increased 12% to $229 million, while the collaboration revenues we recognized from Viatris have increased 27%. We are expecting top line data for the CYPRESS study in 2025. If successful, we'll act decisively with our regulatory and precommercialization strategies in order to bring about ampreloxetine's successful filing and launch.
As Aziz will also discuss, we will execute this strategy while deploying our capital in a way that maintains the company's strong financial position throughout. We believe we're well positioned to achieve significant milestones in the coming years as well as meaningful royalties on YUPELRI and TRELEGY in the future.
With that, I'd like to turn the call over to our Head of Development, Aine Miller, who will provide some brief comments on ampreloxetine. Aine?