The objective of this work is to clarify by a retrospective study the prognostic parameters of breast cancer in young Moroccan women and to clarify the epidemiological histological and prognostic characteristics in a subgroup that have a metastatic relapse in order to determine the impact of the diferent prognostic factor on overall survival. During a period of 5 years, from January 2010 to December 2015, 325 women suffering from breast cancer were counted at the Radiotherapy Department of the Mohammed V Military Hospital of Instruction. Among them, 60 were aged 40 years and under. In our series, patients were followed up until April 2018, 13 cases of metastatic relapses were recorded, i.e. 21.7% of cases. In a single-factor study, the prognostic parameters were mean consultation time, age, family history of breast cancer, tumor size, histological type, number of lymph nodes invaded, lymphatic embolism, SBR grade, hormone receptor, and herecept-test status. The overall survival rate of all patients was 92,1% at 3 years and 88,9% at 5 years. Multifactorial analysis isolated 3 prognostic parameters: initial tumor size, the number of lymphaitic gonglion invaded and the molecular type.