Abstract: Apparatuses, systems, and methods are disclosed for noninvasive medical diagnostics using electrical impedance metrics and clinical predictors. A method includes applying an electrical current to at least one interrogation electrode placed on a surface of a person's body within a Sappey Plexus region of the person's breast. A method includes measuring an electrical impedance of the person's tissue between the at least one interrogation electrode placed within the Sappey Plexus region of the person's breast and a reference electrode. A method includes comparing the measured electrical impedance to previously-captured electrical impedance measurements of corresponding tissue to determine an indication of a presence of a malignant tumor in the person's tissue.