Thanks, Steven, and good morning, everyone. Our financial performance for the fourth quarter was very strong. We recorded $444 million of total revenue. This was comprised of $302 million Jakafi net product revenue, $19 million in Iclusig net product revenue, $48 million in Jakavi royalties from Novartis, $5 million in Olumiant royalties from Lilly and $70 million in milestone revenue. For 2017, we recorded $1.5 billion of total revenue. This was comprised of $1.1 billion of Jakafi net product revenue, $67 million of Iclusig net product revenue, $152 million of Jakavi royalties from Novartis, $9 million of Olumiant royalties from Lilly and $175 million in milestone revenue. Our gross net adjustment for Jakafi for 2017 was approximately 13%. Our cost of product revenue for the quarter and the full year was $22 million and $79 million respectively. Our R&D expense for the quarter was comprised of $297 million of ongoing R&D expense and $150 million upfront payment under the license agreement with MacroGenics for a total R&D expense of $447 million, which includes $23 million in non-stock – non-cash stock compensation. Our R&D expense for the full year was comprised of $955 million of ongoing R&D expense, $12 million related to a in-process R&D asset impairment, and approximately $359 million in upfront consideration and milestone expenses related to our collaboration agreements, for total R&D expense of $1.3 billion, including $90 million in non-cash stock compensation. Our SG&A expense for the quarter and the full year was $98 million and $366 million, respectively, including $11 million and $43 million in non-cash stock compensation for the quarter and full year, respectively. For our expense related to the change in fair market value with contingent consideration for Iclusig royalty liability for the quarter, we recorded $10 million and $8 million, respectively. Moving on to nonoperating expenses. We recorded a $22 million unrealized loss on our long-term investments in Merus and Agenus for the quarter, and $24 million unrealized loss on these same investments for the full year. Our net loss for the quarter and the full year was $150 million and $133 million, respectively. Recall, these amounts include expenses related to our collaboration agreements of $150 million for the fourth quarter and $359 million for the full year. Looking at the balance sheet, we ended the year with $1.2 billion in cash and marketable securities. To summarize, we're extremely pleased with the performance in 2017. Jakafi delivered strong revenue growth. We ended the year on a strong cash position. We retired over $700 million of debt from our balance sheet. We entered into development agreements with Calithera and MacroGenics, which added to our already extensive product pipeline, and we continue to make significant advancements in our clinical development programs. Before moving on to 2018 guidance, I'd like to briefly discuss the impact of the recent passage of the Tax Cuts and Jobs Act on our business. We expect significant reductions to our future tax liabilities after we have fully utilized our net operating loss carryforwards and tax credit carryforwards. Given our geographic mix of income, such as Jakafi U.S. revenue, Jakavi ex-U.S. royalties and our [Swiss tax filing], we estimate our long-term effective tax rate for GAAP and non-GAAP will be in the range of 17% to 18%. Beginning in 2018, we'll include non-GAAP financial metrics in our financial disclosure. We believe this will provide useful information for understanding our ongoing business performance and align us with our industry peers. On the next slide, I'll detail the specific non-GAAP adjustments that Incyte intends to make on a go-forward basis. Our non-GAAP financial results will exclude the impact of the following: certain items related to our collaboration agreements, such as milestone revenue, upfront consideration and milestone expense; and changes in the fair market value of equity investments. For example, the milestones recognized from Novartis and Lilly will be excluded; non-cash stock compensation; certain impacts of purchase accounting, such as the amortization of product rights and changes in the fair market value of contingent consideration. For example, the change in the fair value of the contingent consideration and the amortization of acquired product rights related to Iclusig product acquisition will be excluded; and other items, such as non-cash interest expense, non-routine items and the tax effect of non-GAAP adjustments. Going forward, you will always be able to refer to our 8-K and earnings release for a full reconciliation of GAAP to non-GAAP items. The numbers I previously discussed relating to our 2017 performance were GAAP numbers. If we were to apply these non-GAAP adjustments to the quarter and the full year 2017 income statements, non-GAAP net income would be $4 million for the quarter and non-GAAP net income will be $131 million for the full-year. Moving on to 2018, I'll now discuss the key components of our 2018 guidance on both a GAAP and non-GAAP basis to assist in our transition. Please note that the guidance we provided today does not include any potential future strategic transactions beyond the agreements previously announced. For the full year 2018, we expect GAAP and non-GAAP net product revenue from Jakafi to be in the range of $1.35 billion to $1.4 billion. For Iclusig, we expect GAAP and non-GAAP net product revenue to be in the range of $80 million to $85 million. We will not be providing guidance from milestone or royalty revenue from Lilly or Novartis. We expect our gross net adjustment for 2018 to be approximately 14% for Jakafi. We expect GAAP cost of product revenues to be in the range of $85 million and $95 million, and non-GAAP cost of product revenues to be in the range of $64 million to $74 million. The GAAP cost of product revenues includes the cost of goods sold for Jakafi and Iclusig, the payments of royalties to Novartis on U.S. Jakafi net sales and the amortization of acquired product rights relating to Iclusig product acquisition. On a non-GAAP basis, we'll exclude the amortization of acquired product rights related to the Iclusig product acquisition. We expect GAAP R&D expense to be in the range of $1.2 billion to $1.3 billion. This includes stock-based compensation of $110 million to $115 million and a $13 million upfront consideration related to the Syros collaboration agreement. On a non-GAAP basis, we'll exclude stock compensation and the upfront consideration related to the Syros collaboration. Therefore on a non-GAAP basis, we expect R&D expense to be in the range of $1,077,000,000 to $1,172,000,000. On an adjusted basis, our increase in R&D year-over-year is largely driven by the advancement of epacadostat Phase III studies, our portion of the expense for new studies and additional indications for baricitinib, advancement of the Phase III study of itacitinib in GVHD, and the advancement of our other compounds in development. We expect SG&A expense to be in range of $515 million to $534 million. This includes approximately $125 million of epacadostat prelaunch expenses, which we expect to incur in the second half of the year. This will also include stock-based compensation of approximately $50 million to $55 million. On a non-GAAP basis, we'll exclude the stock compensation and, therefore, on a non-GAAP basis, we expect SG&A expense to be in a range of $465 million to $480 million. Adjusting for the epacadostat prelaunch expenses of $125 million, our 2018 SG&A guidance is a modest increase over 2017 actual SG&A expense. We expect the change in the fair market value of contingent consideration for the Iclusig royalty liability to be approximately $30 million on a GAAP basis, and we'll remove this entire amount on a non-GAAP basis. Lastly, we expect to end the year with approximately the same level of cash and marketable securities compared to our current balance. Operator, this concludes our prepared remarks. Please give your instructions and open up the call for Q&A. Thank you.