Table 1.

Patient, tumor, and treatment variables for patients who received 26 Gy in 5 fractions ± boost between March and August 2020

		Variable		No. patients	(%)
(a)	Patient
	Age, y at diagnosis
	<40			1	1
	40-49			7	5
	50-59			33	24
	60-69			50	37
	70-79			39	29
	80+			5	4
(b)	Tumor
	Breast cancer laterality
	Left			64	47
	Right			71	53
	Histology type
	Ductal			105	78
	Lobular			11	8
	Mixed			8	6
	Other			11	8
	Tumor stage
	Tis			2	2
	T1			91	67
	T2			41	30
	T3			0	0
	T4			1	1
	No. of positive nodes
	pN0			117	87
	pN1 (mi)			12	9
	pN1a			5	3
	pN2			1	1
	Estrogen receptor status
	Positive			126	93
	Negative			9	7
	Her2 receptor status
	Positive			12	9
	Negative			123	91
	Tumor grade
	Grade 1			27	20
	Grade 2			73	54
	Grade 3			35	26
	Lymphovascular invasion
	Absent			97	72
	Present			38	28
(c)	Treatment
	Type of surgery
	Mastectomy			5	4
	Breast-conserving			130	96
	Axillary staging
	Sentinel node biopsy			133	98
	Axillary clearance			1	1
	No axillary surgery			1	1
	RT
	Whole breast only			97	72
	Whole breast + sequential boost
			10.68 Gy/4 f	25	19
			12 Gy/4 f	1	1
			13.35 Gy/5 f	2	2
			16 Gy/8 f	5	3
	Chest wall			5	3
	Deep inspiration breath hold
	Yes			21	16
	No			114	84
	All women			135	100

Abbreviations: f = fraction; RT = radiation therapy.