Daniel Spiegelman
Analyst · Canaccord
Thanks, Jeff. While our complete financial results will be available shortly [indiscernible] audited financials, we thought it would be helpful to provide revenue results for 2013, confirmation of 2013 expense and bottom line guidance and then provide financial guidance for 2014.
To begin with, total revenue grow over 11.4% to $146.9 million in the fourth quarter of 2013 compared to the fourth quarter of 2012. For the full year, total BioMarin revenue increased to $548.5 million, a 9.5% increase compared to full year revenue in 2012. Naglazyme net product revenue in the fourth quarter was $68.7 million, a 9% increase compared to the same period last year; and was $271.2 million for the full year, a 5.5% increase over the prior year.
Kuvan continued to demonstrate double-digit growth, growing to $45.3 million or a 13.3% increase in the fourth quarter and growing to $167.4 million for the full year, a 17% increase over the prior year. Kuvan is an important focus for our overall business, as we intend to expand our PKU franchise with PEG-PAL, for which we expect to have pivotal data in the fourth quarter of this year.
As noted in the press release issued this morning, we are reaffirming all of our full year 2013 guidance, including non-GAAP net loss and GAAP net loss. Recall that we expect non-GAAP net loss to be between $40 million and $65 million. We believe non-GAAP net loss is the best measure of our operating results because it excludes noncash accounting expenses, such as stock compensation and interest expense. In 2013, we had a little over $70 million of these expense items that are noncash and noncash for all time.
In 2014, we expect to have over $100 million of these charges in our GAAP results, further emphasizing our internal focus on this profit-loss measure. For completeness, we also continue to expect GAAP net loss to be between $185 million and $160 million for the full year.
Turning now to guidance for full year 2014. This will be an exciting year for BioMarin as we launch what we expect to be our largest revenue product to date and see the expansion of our development portfolio. On the revenue front, we look forward to total revenues in the $650 million to $680 million range, a more than 20% increase over 2013. For our established commercial products, we expect total revenues of approximately $600 million. This includes continued growth in Naglazyme to between $290 million and $310 million. And in Kuvan, the total net product revenues are between $180 million and $200 million. As noted before, with PEG-PAL Phase III dated at the end of this year, continued growth in the Kuvan franchise is an encouraging indicator of the market opportunity for what could be our next product.
Based on Friday's FDA approval of VIMIZIM and our current understanding of the timing of EU approval, we are reiterating our revenue guidance for VIMIZIM for 2014 within a range of $60 million to $70 million. Of course, first-year revenue numbers can move substantially depending on which month patients initiate commercial therapy. To help you better evaluate launch progress in 2014, during our initial launch here, we intend to provide information on a key internal metric, total number of patients on commercial therapy. Our goal for 2014 is to be at 350 or more patients on drug by the end of the year, which would set us up for a substantial revenue year in 2015.
Turning now to operating expenses. As previously discussed, R&D expenses are expanding to support the 7 programs in clinical and preclinical development. And as a result, we expect that R&D expenses for 2014 will be in the range of $500 million to $530 million. Looking beyond 2014, we continue to expect that this will be our peak year in terms of R&D as a percentage of revenues, and we expect that ratio will fall next year and in the years beyond that. Also, in absolute terms, we expect any increase in R&D over the next couple of years to be materially smaller in magnitude than the increase in 2014.
Following is some additional detail on where we are investing in 2014. Fully 55% of the R&D is going to our 5 clinical programs, with an additional 15% also going to VIMIZIM as we keep patients in studies and on drug until we obtain additional regulatory approvals around the world. Included in our clinical spend is over $80 million in clinical drug supply for VIMIZIM and the other clinical programs. In addition to our clinical programs, there's 20% for research preclinical programs, such as Naglazyme therapy, and general R&D. In addition, there's 10% for regulatory and other support of our existing commercial products. 2014 SG&A expenses are expected to be in the range of $265 million to $285 million, with the majority of the increase due to the commercial and administrative support required to launch VIMIZIM and continue to grow Naglazyme and Kuvan.
This increase is consistent with our prior guidance that there would be a 25% increase in SG&A to support VIMIZIM, with most of it coming in 2014. That 25% increase still seems right in total, with the balance coming in 2015. During this year of initial revenues from VIMIZIM, full R&D expenses and launch-year commercial expenses, our operating loss as measured by non-GAAP net loss will expand somewhat to a net loss of $100 million to $130 million. As VIMIZIM revenues increase, we will drive the company first to breakeven and then to profitability. Our multi-year plan is still to transition to operating profitability at around $1 billion in revenues. Our final guidance item, GAAP loss in 2014, is projected to be between $255 million and $285 million.
Now I'd like to hand the call back over to J.J. for closing remarks. J.J.?
Jean-Jacques Bienaimé: Yes, thank you, Dan. So before we open the call for questions, I want to conclude by reminding everybody that BioMarin is committed to making a big impact on small patient populations with serious unmet medical needs. I think Friday's approval is another example of our execution and leadership in rare diseases and our deep knowledge and expertise in developing enzyme replacement therapies. I am very proud of the team, and again, I want to thank everyone at BioMarin for their contribution to Friday's approval of VIMIZIM. At this time, we will open the call to your questions. Operator?