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It's practically impossible with DCIS that lymph nodes would have tumor in them: the "IS" part of DCIS stands for in-situ, which means non invasive, not having crossed the membranes that separate the lining of the ducts from blood vessels and lymph nodes. So when there's DCIS only, most people would not recommend lymph node sampling. It's not considered necessary. Pretty much by definition, they're ok.