Radiation-induced bronchiolitis obliterans organizing pneumonia (BOOP) syndrome in breast cancer patients is associated with age

Table 2 Radiation therapy details

	BCT (n = 948)	PMRT (n = 228)
Total dose and fractions^*
50 Gy in 25 fractions	42	169
50 Gy in 20 fractions	100	0
53.2 Gy in 20 fractions	114	0
60 Gy in 30 fractions	468	51
66 Gy in 33 fractions	200	4
70 Gy in 35 fractions	0	2
Others	43	2
Boost to the tumor bed (yes/no)^*	917 (95%)/50 (5%)	58 (25%)/170 (75%)
Lung V20 (%), median (range)	6.2% (0.2-31.8)	13.7% (2.3-24.7)
Overall radiation therapy time (days), median (range)	42 days (21-65)	36 days (28-66)

^*The 19 patients of 948 had bilateral breast cancers simultaneously and were treated with BCT, as a result, the treatment planning of 967 patients were evaluated.

ISSN: 1748-717X