Yes, quite easily without treatment and even then there is still a risk.
Nat Miller died in 1983 of leukaemia.
Heli Takala died in 3 August 1998 of leukaemia.
Jean Chabot died in 11 October 2003 of leukaemia.
Children with Leukaemia was created in 1988.
I think that question is impossible to answer as there are different types of leukaemia. Treatments are improving all the time. Many people die from other causes whilst having leukaemia.
Klaus Schlesinger died on May 11, 2001, in Berlin, Germany of leukaemia.
Terry Nutkins died on September 6, 2012, in Scotland, UK of leukaemia.
Marie Otal died on November 17, 2009, in Brussels, Belgium of leukaemia.
Oliver Hasenfratz died on November 14, 2001, in Berlin, Germany of Leukaemia.
Armand Abplanalp died on November 30, 2000, in Cully, Switzerland of leukaemia.
Mustapha Kateb died on October 28, 1989, in Marseille, France of leukaemia.
Antonio Neiwiller died on November 9, 1993, in Rome, Lazio, Italy of leukaemia.