Table 1.

In vitro binding analysis of ²¹²Pb-225.28 to human triple-negative breast cancer (TNBC) cells and cancer-initiating cells (CICs).

	aKd ± S.E.M. (nmol/L)	a Binding Sites/Cell ± SEM (×103)	Internalization (%)
Adherent SUM159	0.6 ± 0.1	29 ± 4.2	56
CIC SUM159	0.3 ± 0.1	49 ± 12	57
Adherent 2LMP	0.5 ± 0.1	b 3.4	49
CIC 2LMP	0.5 ± 0.2	b 7.7	47

^a Data are presented as the mean ± SEM of 1–3 individual experiments, with each experiment performed with duplicate wells. ^b Mean of a single experiment performed with duplicate wells.