Gastric side effects and the stomach dosimetric analysis in left-sided breast cancer radiotherapy in free-breathing and deep inspiration breath-hold technique

Table 2 The fractionated dose schemes of patients

Category	Dose		FB	DIBH
	Course I	Course II
	Whole breast (lumpectomy bed)	Lumpectomy bed
Number of patients			74	54
Hypofractionated RT			31	40
15F ± 5F	2.7 Gy/F	2.0 Gy/F	22	26
16F ± 5F	2.7 Gy/F	2.0 Gy/F	4	7
15F	2.7 Gy/F (3.33 Gy/F)	–	5	7
Conventional RT			43	10
25F ± 5F	2.0 Gy/F	2.0 Gy/F	27	7
27F	2.0 Gy/F (2.22 Gy/F)	–	16	3

In the hypofractionated RT cohort, most patients received the treatment regimen in which whole breast irradiation was followed by photon or electron boost of 10 Gy in five fractions to the tumor bed.For the patients whose treatment course was interrupted by holiday, one fraction was added in order to ensure treatment effect (16F ± 5F). Or the whole breast and boost planning target volumes were treated simultaneously.In the conventional team, the left breast and tumor bed were treated simultaneously for the patients who underwent breast-conserving radiotherapy. While for patients without metal clips in their tumor bed, electron boost of 10 Gy in five fractions was conducted after 25 fractions of left breast treatment. The radiotherapy dose of the second course was not collected in this study
RT radiotherapy

ISSN: 1748-717X