AFP and liver cancer: Alpha‐fetoprotein (AFP) is one of the most widely used biomarkers for early diagnosis of individuals with liver cancer.[281, 282] To date, various aptamer‐based AFP sensors have been demonstrated,[283] with several assays showing potential for their use with complex matrices.[284, 285, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295] Toward sensitive and highly selective detection of AFP in clinical serum samples, Li et al.