IL6 and breast carcinoma: In particular, we propose a setup for the incorporation of a reduced graphene oxide (rGO) immunosensor array on commercially realized printed circuit boards (PCB), intended for IL-6 detection in an OoC during the culturing of breast cancer cell line MCF7, for which increased levels of IL-6 secretion have been associated with poor prognosis and resistance in therapy in breast cancer patients [23].