LAP3 and cancer: Kolemen’s group devised the photosensitizer HCL by decorating hemicyanine with heavy atom bromine (Figure 17A), and Hua et al. proposed a ratiometric fluorescent probe DPP-Leu based on diketopyrrolopyrrole (DPP) (Figure 17B) to perform photodynamic therapy efficaciously for cancer cells overexpressing LAP [71,72].