EGFR and neoplasm: In order to solve the lack of specific tumor-targeting capability, anti-EGFR Affibody (ZEGFR:1907)-based Ag2S QD (ZEGFR:1907-Ag2S QDs) nanoprobes have been successfully synthesized and used for targeted photoacoustic imaging of EGFR-overexpressed tumor (Zhang et al., 2018b).