Table 3.

Univariate analysis of categorical variables in 811 patients with radiation pneumonitis.

Variables		RP (n)	nRP1 (n)	χ2	P
Surgical approach2				3.613	0.057
	BCS	17	371
	MRM	32	391
Tumor stage				9.213	0.010
	I	16	196
	II	11	337
	III	22	229
Chemotherapy regimens3				4.437	0.350
	AC-T	28	355
	TCb	11	140
	TAC	4	107
	TC	4	97
	AC	2	63
Chemotherapy-radiotherapy interval time				2.196	0.533
	21 ∼ 22 days	12	126
	23 ∼ 24 days	14	223
	25 ∼ 26 days	12	208
	27 ∼ 28 days	11	205
CSI4				115.908	<0.001
	Yes	43	152
	No	6	610

¹ nRP, non-RP.

² BCS. breast-conserving surgery; MRM, modified radical mastectomy.

³ AC-T, anthracycline plus cyclophosphamide followed by taxane; TCb, taxane plus carboplatin; TAC, taxane plus anthracycline plus cyclophosphamide; TC, taxane plus cyclophosphamide; AC, anthracycline plus cyclophosphamide

⁴ CSI, chest wall + supraclavicular + internal mammary lymph node irradiation.