TABLE 1

Quantitative ¹⁸F-FFNP Binding Parameters

Cell line	Total receptor density (fmol/mg)	95% CI	K_d (nM)	95% CI	R²
MDA-MB-231	NA	NA	NA	NA	NA
231 PR-A	970 ± 62	847–1092	0.82 ± 0.19	0.44–1.20	0.87
231 PR-B	2,621 ± 189	2,248–2,995	0.35 ± 0.11	0.14–0.55	0.86
T47D	2,934 ± 97	2,743–3,126	0.52 ± 0.07	0.39–0.66	0.94

NA = not applicable.