If , as the literature suggests , NK activity is relevant to breast cancer control , and since ER -tumors have a worse prognosis , we suggest here that perhaps such tumors are resistant to control by NK cells because they lack the ability to attract an accumulation of effector cells to the tumor site , or because blocking factors at the site of the tumor prevent local tumor control at the site of action .
if , as the literature suggests , nk activity is relevant to breast cancer control , and since er -tumors have a worse prognosis , we suggest here that perhaps such tumors are resistant to control by nk cells because they lack the ability to attract an accumulation of effector cells to the tumor site , or because blocking factors at the site of the tumor prevent local tumor control at the site of action .
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