Development of a Microfluidic-Based Optical Sensing Device for Label-Free Detection of Circulating Tumor Cells (CTCs) Through Their Lactic Acid Metabolism. - Tzu-Keng Chiu; Kin Fong Lei; Chia-Hsun Hsieh; Hung-Bo Hsiao; Hung-Ming Wang; Min-Hsien Wu (Sensors, 2015)