PARIS, FRANCE - OCTOBER 31: (L-R) Queen Letizia of Spain and French President Francois Hollande attend the World Cancer Congress at Palais des Congres on October 31, 2016 in Paris, France. (Photo by Marc Piasecki/Getty Images)
PARIS, FRANCE - OCTOBER 31: (L-R) Queen Letizia of Spain and French President Francois Hollande attend the World Cancer Congress at Palais des Congres on October 31, 2016 in Paris, France. (Photo by Marc Piasecki/Getty Images)