Table 1.

Radiolabeled molecules or peptides for imaging

Agent	Target	Class	Stage	Active clinical trials	References
18F- AraG	Deoxyguanosine kinase (dGK)	Small Molecule	Clinical	NCT04052412, NCT03142204, NCT04186988, NCT03129061, NCT03684655, NCT03367962	10, 11, 135
18F-CFA	dCK	Small Molecule	Clinical	NCT03409419	136
1-L-18F-FETrp	IDO	Small Molecule	Preclinical		137
18F-FAC	Deoxycytidine kinase (dCK)	Small Molecule	Clinical		8
68Ga-WL12	PD-L1 PD-L1 PD-L1 PD-L1 PD-L1 PD-L1	Peptide	Preclinical		138
18F-FPy-WL12		Peptide	Preclinical		24
18F-NOTA-ZPD-L1_1		Affibody	Preclinical		139
64Cu-DOTA-FN3hPD-L1		Adnectin	Preclinical		140
68Ga-NOTA-Nb109		Nanobody	Preclinical		141
64Cu-DOTA-HAC-PD1		High-affinity PD-1 ectodomain	Preclinical		142, 143