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Background:Fewstudiesofbreastcancersurgeryoutcomeshaveusedlongitudinaldataformorethan2years.Thisstudyaimedtovalidatetheuseoftheartificialneuralnetwork(ANN)modeltopredictthe5-yearmortalityofbreastcancerpatientsaftersurgeryandcomparepredictiveaccuracybetwee