PTK2 and neoplasm: The peak uptakes of the two radiotracers were observed at 60 min and 30 min post injection, respectively (1.39 ± 0.30%ID/g and 6.58 ± 0.46%ID/g, respectively); the tumor/blood and tumor/muscle ratios for [18F]7c were 2.40 and 1.88, consistent with the FAK inhibitory experiment results, indicating that the [18F]7a and [18F]7c were mainly specific to FAK in vivo.