Table 3.

Radiotherapy technique.

		C group		M group
		n	%	n	%
		768	79.2	201	20.7
Volume	Breast	768	100	–	–
	Chest wall	–	–	201	100
	Supraclavicular	130	16.9	167	83.1
	Axila	56	7.3	68	33.8
	IMC	21	2.7	6	3
Dosimetry breast or chest wall	2D	2	0.3	–	1.5
	3D	758	98.7	–	97.5
	IMRT	8	1		0
Energy	Cobalt	90	11.7	10	5
	4–6 MV	643	83.7	160	79.6
	>6 MV	24	3.1	3	1.5
	Electrons	–	–	22	10.9
	Combinations	11	1.4	6	3
Boost	Yes	522	68	25	12.4
	No	246	32	176	87.6
Dosimetry boost	2D	94	18	7	28
	3D	425	81.6	18	72
	IMRT	2	0.4	–	–
Energy boost	Cobalt	40	7.7	–	–
	Photons	123	23.7	3	12
	Electrons	311	59.8	22	88
	HDR	46	8.8	–	–
Total dose	<46 Gy	59	7.5	9	4.5
Breast or chest wall	46–50.4 Gy	704	91.8	188	93.5
	>50.4 Gy	3	0.4	4	2
Fraction dose	<2 Gy	35	4.6	13	6.5
Breast or chest wall	2 Gy	675	87.9	180	89.6
	2.5–2.67 Gy	42	5.5	7	3.5
	>5 Gy	14	18.2	1	0.5
Total dose boost	<10 Gy	51	9.7	3	12
	10–15 Gy	244	46.3	15	60
	16–20 Gy	174	33	7	28
Fraction dose boost	<2 Gy	1	0.2	–	–
	2 Gy	422	80.1	22	88
	2.3–2.67 Gy	7	1.3	2–1	8
	3–4.5 Gy	46	8.7	1	4
	5–10 Gy	46	8.7	–	–

C group, conservative group; M group, mastectomy group; IMC, internal mammary chain.