2217
Seven of the eight cases of acute leukemia occurred in a series of 553 patients treated with Treosulfan for ovarian cancer in the period from 1970 to 1977 and followed closely for a total of 1159 patient-years up to February 1978.
 Seven of the eight cases: Subject; eight: Subject.Population; acute leukemia: Effect; Treosulfan: Treatment; Treosulfan: Treatment.Drug; ovarian cancer: Treatment.Disorder
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 Seven of the eight cases: Subject; eight: Subject.Population; acute leukemia: Effect; Treosulfan: Treatment; Treosulfan: Treatment.Drug; ovarian cancer: Treatment.Disorder