This study project aims to evaluate the feasibility and safety of using 1 grain of iodine for localization purposes by means of a randomized comparative study comparing wire localization with iodine seed localization in patients presenting an in situ, biopsy-proven, non-palpable invasive or ductal breast carcinoma requiring conservative surgical management associated, or not, with an axillary procedure (SN removal or axillary curettage).