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This report presents a case of colon perforation which occurred 4 months after treatment with intraperitoneal chromic phosphate for stage IB ovarian papillary serous cystadenocarcinoma.
 ( adverse event: occurred ,  colon perforation: Effect, intraperitoneal chromic phosphate: Treatment, chromic phosphate: Treatment.Drug, 4 months: Treatment.Time_elapsed, intraperitoneal: Treatment.Route, stage IB ovarian papillary serous cystadenocarcinoma: Treatment.Disorder) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: occurred ,  colon perforation: Effect, intraperitoneal chromic phosphate: Treatment, chromic phosphate: Treatment.Drug, 4 months: Treatment.Time_elapsed, intraperitoneal: Treatment.Route, stage IB ovarian papillary serous cystadenocarcinoma: Treatment.Disorder) 