[Table/Fig-3]:

Rate of pathological similarity between two tumours in bilateral breast cancer

Variable (n patients) (%)	Synchronous(n=28)	Metachronous(n=2)
Histology Type concordance (22) (73%)	21	1
Grade concordance (15/22) (69%)*	15	0
ER Concordance (25) (83%)	0	2
Both (+)	23	1
Both (-)	2	0
ER discordance (5)(17%)
One (+)/ other (-)	4	1
PR Concordance (24) (80%)	11	1
Both (+)	20	1
PR discordance (24) (20%)
One (+)/ other (-)	3	0
Her2 Concordance (27) (90%)
Both (+)	5	0
Both (-)	21	1
Her-2 discordance (3)(10%)
One (+)/ other (-)	2	1

*Tumours graded by Elston-Ellis modification of Scarff-Bloom-Richardson grading system