Import and export of pharmaceutical drugs is done by the Quimefa Pharmaceutical Business Group (FARMACUBA) under the Ministry of Basic Industry (MINBAS). This group also provides technical information for the production of these drugs. Isolated from the West by the US embargo, Cuba developed the successful lung cancer vaccine, Cimavax, which is now available to US researchers for the first time, along with other novel Cuban cancer treatments. The vaccine has been available for free to the Cuban population since 2011. According to Roswell Park Comprehensive Cancer Center CEO Candace Johnson: "They've had to do more with less, so they've had to be even more innovative with how they approach things. For over 40 years, they have had a preeminent immunology community." During the thaw in Cuba–U.S. relations starting in December 2014 under the Obama administration, a growing number of U.S. lung cancer patients traveled to Cuba to receive vaccine treatment. The end of the thaw under the Trump Administration has resulted in a tightening of travel restrictions, making it harder for U.S. citizens to travel to Cuba for treatment.