keywords: arafat palestinian leukemia yasser france
text: Gravely Ill Arafat Arrives in France for Treatment  VILLACOUBLAY MILITARY AIRFIELD, France (Reuters) -  Palestinian leader Yasser Arafat, weakened by what doctors  think may be leukemia, left the West Bank for the first time in  2-1/2 years on Friday and flew to France for medical treatment.