Johanna Mercier
Chief Commercial Officer at Gilead Sciences
Thanks, Dan, and good afternoon, everyone. With the first quarter marking the ninth consecutive quarter of year-over-year growth for our base business, our teams delivered a strong start to 2024, notably navigating the seasonal first quarter dynamics and establishing a firm base on which we can continue to build this year.
Beginning on Slide 8. Total product sales excluding Viklury were $6.1 billion for the first quarter, up 6% year-over-year reflecting solid growth across our HIV, oncology and liver disease businesses. Including Veklury, total product sales were $6.6 billion, up 5% year-over-year.
Moving to HIV on Slide 9. Sales were up 4% year-over-year to $4.3 billion, primarily driven by higher demand as well as favorable pricing dynamics in Europe that are not expected to repeat. Quarter-over-quarter sales were down 7% driven by the typical seasonality we experienced in the first quarter of the year, partially offset by higher demand. As a reminder, quarterly HIV growth is in general more variable and less indicative of overall trends than the full year. This is evident in the first quarter of every year where inventory drawdown typically occurs following a build that generally happens towards the end of the prior year and patient co-pays and deductibles reset at the start of every year and together with shifts in channel mix lowers average realized price in the first quarter. As always, we typically see these quarterly pricing and inventory dynamics normalize as we progress throughout the year. We continue to expect approximately 4% HIV sales growth for 2024.
Supporting that outlook, the treatment market grew in line with our expectations as shown on Slide 10. Biktarvy remains the leading regimen for HIV treatment across major markets for new starts as well as for those switching regimens with sales up 10% year-over-year to $2.9 billion reflecting strong demand. Quarter-over-quarter sales were down 5% as the higher demand was offset by the typical seasonal factors discussed earlier. It's notable that six years after launch, Biktarvy continues to gain market-share in the U.S., up 3 percentage points year-over-year to approximately 49% share and once again outpacing all other branded regimens for HIV treatment. Moreover, we continue to see Biktarvy's benefit extend into broader populations of people with HIV. Most recently, Biktarvy was granted FDA approval for use in virologically suppressed individuals with known or suspected M184 resistance, a common form of treatment resistance.
Turning to prevention. Descovy sales were down 5% year-over-year to $426 million, driven by lower average realized price due to channel mix, partially offset by higher demand. Sequentially, sales were down 16% reflecting the seasonal dynamics discussed earlier, partially offset by higher demand. While market volumes in February were temporarily disrupted by the cyber attack on Change Healthcare, volumes readily recovered in March. Overall, the PrEP market continued to demonstrate robust growth, up over 11% in the first quarter with Descovy maintaining over 40% PrEP market share in the U.S. despite the availability of other regimens, including generics. This is a solid setup as we look to potentially launch lenacapavir as early as late next year as the first and only twice yearly subcutaneous prevention option. Given Gilead's strong commercial foundation across treatment and prevention, we are well-positioned to maintain leadership in HIV as we look to the evolving marketplace of daily orals, long-acting orals and long-acting injectables.
Moving to liver disease on Slide 11. Sales for the first quarter were $737 million, up 9% year-over-year, primarily driven by favorable inventory dynamics and the timing of purchases by the Department of Corrections for our HCV products as well as higher demand across HCV, HBV and HDV. Sequentially, sales were up 7%, primarily reflecting the timing of HCV purchases. Despite fewer HCV starts globally year-over-year, our viral hepatitis portfolio overall has remained stable and continues to be a meaningful contributor to our commercial performance. This strength is underpinned by our extensive global footprint and expertise in the treatment of liver diseases.
To that end, pending approval, Gilead is excited to bring seladelpar to patients for the treatment of certain adults with PBC impacting approximately 130,000 people in the U.S. and about 125,000 people in Europe. With a sales force that covers almost 80% of the U.S. prescriber base for PBC, we expect to readily make seladelpar available to patients upon approval in the second half of this year. Seladelpar has demonstrated the potential to be best-in-class with a differentiated clinical profile to existing and emerging therapies, particularly on a key symptom of the disease, pruritus. Following its launch in 2024, we expect seladelpar to contribute modestly to sales and more meaningfully in 2025 and beyond.
Turning to Slide 12. Viklury continues to be the standard-of-care antiviral for hospitalized patients treated with COVID-19 with market share well over 60% in the United States. COVID-related hospitalizations were lower in the first quarter with the winter wave peaking earlier than expected in the U.S. and Europe as compared to other regions such as Japan. As a result, Veklury sales overall were down 3% year-over-year and down 23% sequentially to $555 million.
Shifting to oncology on Slide 13. Sales were up 18% year-over-year to $789 million and are now firmly above a $3 billion annual run rate. Having treated over 50,000 patients to date, we look forward to bringing our portfolio of medicines and future treatments across lines of therapies and tumor types to many more patients around the world.
Moving to Slide 14. Trodelvy sales for the first quarter exceeded $300 million, up 39% year-over-year reflecting continued demand. Sequentially, sales were up 3%, primarily driven by demand outside the U.S. as well as unfavorable fourth quarter pricing dynamics in Europe that did not repeat. This was partially offset by inventory dynamics in the U.S. where we saw a drawdown in the first quarter. Overall, Trodelvy's strong market share reflects its awareness amongst providers and patients. In second line metastatic triple negative breast cancer, Trodelvy remains the leading regimen with approximately one-third share in the U.S.
And in the pre-treated HR-positive HER2 negative metastatic breast cancer setting, Trodelvy has demonstrated continued adoption, most notably in the IHC0 setting. We are confident Trodelvy continues to differentiate itself with its safety profile and clinically meaningful survival benefits with over 30,000 patients across tumor types already treated to date. We look forward to potentially extending Trodelvy's reach to many more patients in the years ahead, particularly in bladder cancer, earlier line breast cancer settings and lung cancer.
Turning to Slide 15 and on behalf of Cindy and the Kite team, cell therapy sales were $480 million in the first quarter, up 7% year-over-year. Sequentially, sales were up 3% in line with our guidance of flat to slightly up. We're pleased to see continued demand for Yescarta and Tecartus in both existing and new markets across Europe and other geographies such as in Japan where we've seen good progress in growing brand share and expanding our network of authorized treatment centers to over 20 to date.
In the U.S. and consistent with our recent updates, we see opportunity for growth through expanding the number of authorized treatment centers and affiliated satellites while also driving increased referrals from the community setting. For example, we're proud to have established our flagship community collaboration with Tennessee Oncology in the first quarter. We've identified many critical learnings on how we can partner effectively with community oncology practices for cell therapy and we will continue to refine this blueprint so that we become more efficient at onboarding new centers over time. We expect to start seeing the impact from this initiative towards the end of 2024.
Wrapping up the first quarter, we had a strong start to the year, primarily driven by higher demand across each of our core businesses year-over-year. We look forward to carrying this momentum through 2024 and as we bring seladelpar to market later this year following approval. I'd like to thank the commercial teams and cross-functional partners across Gilead and Kite for their strong execution as we diligently expand our therapies to new populations positively impacting more people all around the world.
And with that, I'll hand the call over to Merdad.