RESUMEN
To compare patient-rated cosmetic and satisfactory outcomes between conventional fractionation with simultaneously integrated boost (C-SIB) vs hypofractionation with SIB (H-SIB) in early breast cancer. Patients with stage I and II breast cancer who received breast-conserving surgery followed by radiation with SIB to tumor bed and completed questionnaire were included in this study. Radiotherapy was as follows: C-SIB arm = 50 Gy and 65 Gy in 25 fractions and H-SIB arm = 43.2 Gy and 52.8 Gy in 16 fractions to the whole breast and tumor bed, respectively. Single cross-sectional assessment of the breast cosmesis was done by patients and radiation oncologist at a follow-up visit. Breast cosmetic and satisfaction scores were collected using a four-point Harvard/NSABP/RTOG cosmesis criteria scale and a four-point Likert-type scale, respectively. Of a total of 114 patients (C-SIB = 57) and (H-SIB = 57) arms, a median time from radiotherapy completion to questionnaire response was 7.2 years. Patient-rated cosmetic outcome in C-SIB vs H-SIB was "excellent" in 40.3% vs 45.6%, "good" in 33.3% vs 42.1%, "fair" in 21.1% vs 10.5%, and "poor" in 5.3% vs 1.8% (P = .288). Corresponding satisfaction was "very satisfied" in 52.6% vs 57.9%, "satisfied" in 40.4% vs 35.1%, "neutral" in 7.0% vs 5.2%, and "unsatisfied" in 0% vs 1.8% (P = .683). Stage I and older age at radiotherapy were predictors for favorable (good or excellent) cosmesis and satisfaction, respectively. In early-stage breast cancer, H-SIB provided a trend for better cosmesis than C-SIB while maintaining satisfaction. The reduction in treatment duration and cost as well as favorable cosmesis outcomes encourages the use of H-SIB.