A biomarker PNCK for predicting an efficacy of a dual-targeting agent that targets both c-Met and EGFR and a method of predicting an effect of a dual-targeting agent that targets both c-Met and EGFR, selecting the subject for application of a dual-targeting agent that targets both c-Met and EGFR, or monitoring an effect of a dual-targeting agent that targets both c-Met and EGFR, including measuring a level of a PNCK and/or a PNCK coding gene.