from january 1968 to march 1975 , 115 patients with malignant lymphomas , all aged under 15 years were admitted to the istituto nazionale tumori of milan : 57 had hodgkin 's disease ( mean age 9.7 years ) and 58 non-hodgkin 's lymphomas ( mean age 7.7 yrs ) .
C0024299
malignant lymphomas
C0019829
hodgkin 's disease