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A prospective randomized clinical trial was implemented to assess whether the concomitant or the sequential addition of tamoxifen to chemotherapy provides improved clinical benefit in the adjuvant treatment of breast cancer in postmenopausal patients.
 ( potential therapeutic event: provides ,  postmenopausal patients: Subject, postmenopausal: Subject.Disorder, improved clinical benefit in the adjuvant treatment: Effect, the concomitant or the sequential addition of tamoxifen to chemotherapy: Treatment, tamoxifen: Treatment.Drug, chemotherapy: Treatment.Route, breast cancer: 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:
 ( potential therapeutic event: provides ,  postmenopausal patients: Subject, postmenopausal: Subject.Disorder, improved clinical benefit in the adjuvant treatment: Effect, the concomitant or the sequential addition of tamoxifen to chemotherapy: Treatment, tamoxifen: Treatment.Drug, chemotherapy: Treatment.Route, breast cancer: Treatment.Disorder) 