Scott Smith
Analyst · JPMorgan
Thanks, Jan. In Q1, we demonstrated significant financial progress toward our goal of becoming operating cash flow breakeven on a quarterly basis by the end of 2024. I will touch on some key points surrounding our financial results, but for further details, please refer to our 6-K filed today. SKYTROFA revenue for the first quarter of 2024 was EUR 65 million compared to EUR 31.6 million reported in the first quarter of 2023, an increase of 106% year-over-year. This growth was driven by a significant increase in demand volume, more than doubling compared to the prior year period with a slight offset by a combination of slower channel build, coverage mix, and a modest negative currency impact of EUR 0.8 million.
On a sequential basis, first quarter SKYTROFA revenue increased 1% compared to the fourth quarter of 2023. Strong mid-teens percent demand volume growth was offset primarily by seasonal channel inventory, co-pay resets, insurance reauthorizations, and a modest negative currency impact of EUR 0.6 million. Q1 was in line with our high internal expectations and with seasonal headwinds behind and the steady pace of new patient adds expected to persist. We continue to expect full year SKYTROFA revenue to be in the range of EUR 320 million to EUR 340 million at average 2023 exchange rates.
Shifting to TransCon PTH. YORVIPATH contributed for the first time this quarter with revenue of EUR 1.5 million, representing 2 months of shipments. In Germany and Austria, we ship directly to retail pharmacies for patient pickup. And as a result, there is no channel inventory buildup compared to a typical U.S. launch like we saw with SKYTROFA, where specialty pharmacies hold channel inventory. Closing out the top line, total revenue for the first quarter was EUR 95.9 million, including EUR 24.8 million of noncash license revenue recognized in relation to the formation of Eyconis and EUR 3 million of service revenue related to Eyconis, which is offset in operating expenses.
Turning to expenses. R&D costs in the first quarter totaled EUR 70.7 million compared to EUR 106.1 million during the first quarter of 2023. The 33% decline was largely tied to lower external development costs for TransCon Growth Hormone and TransCon PTH, including a reversal of prior period write-downs of prelaunch inventories as well as oncology programs, partially offset by an increase in TransCon CNP costs. Sequentially, R&D costs declined 22%.
SG&A expenses in the quarter totaled EUR 66.8 million, essentially flat compared to EUR 66.5 million during the first quarter of 2023. Higher employee costs, including the impact from commercial expansion, was partially offset by lower external prelaunch and administrative expenses. Sequentially, SG&A expenses increased 4%. Total operating expenses were EUR 137.5 million for the first quarter, a 20% decrease compared to the EUR 172.7 million during the first quarter of 2023.
Sequentially, operating expenses declined to 11%. Overall, our operating loss in the first quarter totaled EUR 49.1 million compared to an operating loss of EUR 143.7 million during the first quarter of 2023 as a result of increased revenue and lower operating expenses. Sequentially, operating loss increased 34%. Finance expense in the quarter was EUR 77.2 million compared to EUR 8.4 million expense in the fourth quarter of last year. This higher finance expense was largely driven by a noncash derivative loss tied to our outstanding convertible notes.
Quick comment on the balance sheet. As of March 31, 2024, due to amended IFRS rules, which came into effect on January 1, 2024, you'll notice our convertible notes with face value of USD 575 million are now reported as current liabilities even though they do not mature until April 2028 and would not require cash settlement in case of conversion by holders. IFRS still requires the carrying value of the convertible notes and associated derivative liabilities to be presented separately within current liabilities, which together total EUR 622 million.
As per IFRS rules, comparative amounts have been reclassified to reflect the change in presentation. The applied amendments had no other impact on the financial statements. We ended the first quarter with cash and cash equivalents totaling EUR 320 million. And for the full year 2024, based on current plans, we expect SKYTROFA revenue to be in the range of EUR 320 million to EUR 340 million at average 2023 exchange rates. We expect total operating expenses, SG&A and R&D to be approximately EUR 600 million and we expect to be operating cash flow breakeven on a quarterly basis by the end of 2024.
Let me now also highlight selected key milestones. For TransCon Growth Hormone, we now plan to submit an SBLA to FDA for adult GHD in the third quarter of 2024 compared to the previous plan of Q2. And we expect to report top line results from our Phase II Turner syndrome trial in the fourth quarter of 2024. For TransCon PTH, in the U.S., our PDUFA date is May 14, 2024. If approved, we plan to launch it as over path as quickly as possible thereafter. Outside the U.S., with the commercial rollout of YORVIPATH underway in Germany and Austria, we plan to roll out YORVIPATH in our Europe direct and international markets segments throughout 2024 and 2025.
For TransCon C&P, we expect to report top line results from the pivotal ApproaCH trial as well as submit our NDA for treatment of children with achondroplasia, both in the fourth quarter of 2024, and also report week 26 top line data from the COACH trial in combination with TransCon Growth Hormone, also in the fourth quarter of 2024. Within our oncology therapeutic area, during the fourth quarter of 2024, we plan to provide a clinical update from the Phase II indication-specific dose expansion cohorts from our TransCon IL-2 beta/gamma and TransCon TLR 7/8 agonist clinical trials. With that, operator, we are now ready to take questions.