Table 1.

SP-IR by BC cells

	Cell lines	SP-IR, ng/ml
Transformed	MDA-MB-330	146 ±5
	T-47D	209 ± 38
	ZR-75-30	159 ± 12
	BT-474	160 ± 16
	DU4475	90 ± 3
	BT 483	102 ± 8
	184B5	64 ± 8
Normal	MCF-12A	9 ± 2
	Hs578Bst	8 ± 1

ELISA quantitated the production of SP-IR by BC cells. Each point is the mean (±SD) of eight cell passages. Unrelated cell lines CCL-64, L929, and MDBK produced <0.08 ng/mg SP-IR.