Comparison of IORT (Radical and Boost Dose) and EBRT in Terms of Disease-Free Survival and Overall Survival according to Demographic, Pathologic, and Biological Factors in Patients with Breast Cancer

Table 4

Clinical, pathologic, and treatment-related characteristics of the EBRT and radical-IORT groups.

	EBRT		Electron radical		X-ray radical		Total
	N	%	N	%	N	%	N	%
	517	100	315	100	61	100	893	100
Stage
1	89	17.20	222	70.90	24	40.00	335	37.60
2	428	82.80	91	29.10	36	60.00	555	62.40
Total	517	100	313	100	60	100	890	100
Size
	237	52.70	276	88.20	46	78.00	559	68.00
2.5 = 3 cm	83	18.40	25	8.00	11	18.60	119	14.50
	130	28.90	12	3.80	2	3.40	144	17.50
Total	450	100	313	100	59	100	822	100
Grade
1	46	9.30	50	16.80	15	26.30	111	13.10
2	261	52.70	181	60.70	25	43.90	467	54.90
3	188	38.00	67	22.50	17	29.80	272	32.00
Total	495	100	298	100	57	100	850	100
LVI
Positive	188	39.70	35	11.90	10	76.90	233	29.80
Negative	286	60.30	260	88.10	3	23.10	549	70.20
Total	474	100	295	100	13	100	782	100
Ki67
	27	12.20	101	36.50	0	0.00	128	25.40
	195	87.80	176	63.50	4	100.00	375	74.60
Total	222	100	277	100	4	100	503	100
ER
Positive	372	76.40	256	83.90	39	81.30	667	79.40
Negative	115	23.60	49	16.10	9	18.80	173	20.60
Total	487	100	305	100	48	100	840	100
HER2
Positive	91	23.80	52	18.30	11	19.30	154	21.30
Negative	292	76.20	232	81.70	46	80.70	570	78.70
Total	383	100	284	100	57	100	724	100
Age
	110	21.90	3	1.00	0	0.00	113	12.90
=40–50	166	33.00	72	22.90	19	31.70	257	29.30
	227	45.10	239	76.10	41	68.30	507	57.80
Total	503	100	314	100	60	100	877	100
Histology
IDC	483	94.50	218	70.10	39	79.60	740	85.00
ILC	20	3.90	53	17.00	5	10.20	78	9.00
IDC + DCIS	0	0.00	19	6.10	0	0.00	19	2.20
IDC + ILC	0	0.00	17	5.50	5	10.20	22	2.50
Others	8	1.60	4	1.30	0	0.00	12	1.40
Adjuvant therapy
CT + HT	245	68.40	117	51.10	26	65.00	388	61.90
HT alone	33	9.20	78	34.10	7	17.50	118	18.80
CT alone	80	22.30	34	14.80	7	17.50	121	19.30
Total	358	100.00	229	100.00	40	100.00	627	100.00