primary cns lymphoma life expectancybrain lymphoma life expectancylymphoma brain tumor life expectancywaldenstrom lymphoma life expectancyfollicular lymphoma life expectancynon hodgkin's lymphoma life expectancymantle cell lymphoma life expectancysll lymphoma life expectancymarginal zone lymphoma life expectancymyelofibrosis life expectancymyositis life expectancyliver metastases life expectancy