Table 3. Cyclin D1 expression and CCND1 amplification in breast cancer subtypes.

Subtype	Cyclin D1 Negative	Cyclin D1 <10%	Cyclin D1 10–50%	Cyclin D1 >50%	CCND1 Not A	CCND1 low A	CCND1 high A
Luminal A	0	5 (7.3%)	22 (32.4%)	41 (60.3%)	56 (82.3%)	11 (16.2%)	1(1.5%)
Luminal B	2 (3.2%)	1 (1.6%)	15 (23.8%)	45 (71.4%)	45 (71.4%)	5 (7.9%)	13 (20.7%)
HER2	0	4 (30.8%)	5 (38.5%)	4 (30.8%)	12 (92.3%)	0	1(7.7%)
Triple Negative	10 (28.6%)	11 (31.4%)	10 (28.6%)	4 (11.4%)	32 (91.4%)	1 (2.9%)	2 (5.7%)

Not A: not amplified, low A: amplification ≤10 signals per nuclei, high A: amplification >10 signals