Gilead Sciences ( GILD 0.30% ) inked a collaboration deal with Galapagos NV ( GLPG 1.31% ) in 2015 to gain rights to the latter's JAK1 inhibitor filgotinib. Today, Galapagos decided to execute its co-commercialization rights to filgotinib in several European countries. The move comes only weeks ahead of a standstill agreement between the two companies expires and positions Galapagos to split profit in regions covered by the co-marketing agreement. Since Galapagos' decision could have a big impact on its financials, let's learn more about filgotinib and the company's relationship with Gilead Sciences.