Table 2.

Summary of Telomere Length Results for Breast Luminal Cells

Telomere length	Normal lobules (n = 24)	Normal lactiferous ducts (n = 15)	Male breast (n = 5)	Normal pediatric lobules (n = 7)	Fibrocystic changes (n = 10)	DCIS (n = 23)	LCIS (n = 6)	Invasive mammary carcinoma (n = 114)
Very short	0	0	0	0	1	11	1	60 (52.5%)
Short	10	0	0	2*	1	7	4	20 (17.5%)
Normal	8	15	5†	5	8	4	1	24 (21%)
Long	0	0	0	0	0	0	0	6 (5%)
Heterogeneous	6	0	0	0	0	1	0	4 (4%)

^*Luminal shortening was focal in these cases. 

^†Focal luminal telomere shortening was seen in a lobule of a male breast with gynecomastia.