Table 7. Regional variations in histopathological features and treatment modalities (% patients).

	Paris	Northwest	Northeast	Southwest	Southeast
% of high-grade lesions	33	43	44	49	40
% of comedocarcinoma subtype	10	20	26	43	27
% ER assessment	14	12	60	53	31
CS	3	3	8	13	4
Median size (mm)a	8	2.5	5	4	7
CS+RT	77	60	57	61	63
Mastectomy	20	37	35	26	33
Median size (mm)b	40	30	42	27	40
IR	39	64	37	66	64
Hormone therapy	13	6	34	9	12

Abbreviations: CS=conservative surgery; ES=oestrogen receptor; IR=immediate reconstruction; RT=radiotherapy.

^aIn patients treated by CS alone.

^bIn patients treated by mastectomy.