Racial and Ethnic Differences in Long-Term Adverse Radiation Therapy Effects Among Breast Cancer Survivors.

Purpose: Breast and skin changes are underrecognized side effects of radiation therapy for breast cancer, which may have long-term implications for quality of life (QOL). Racial and ethnic disparities in breast cancer outcomes, including long-term QOL differences after breast radiation therapy, are poorly understood.
Methods and Materials: We conducted a cross-sectional survey study of patients from the Texas Cancer Registry who received diagnoses of stage 0-II breast cancer from 2009 to 2014 and treated with lumpectomy and radiation therapy; 2770 patients were sampled and 631 responded (23%). The BREAST-Q Adverse Effects of Radiation overall score and subindices measured the effect of radiation therapy on breast tissue. Multivariable logistic regression evaluated associations of demographic and treatment characteristics with outcomes.
Results: The median age was 57 years (IQR, 48-65), median time from diagnosis to survey response 9 years (IQR, 7-10), and the cohort included 62 Asian American or Pacific Islander (9.8%), 11 American Indian or Alaskan Native (AIAN) (1.7%), 161 Black (25.5%), 144 Hispanic (22.8%), and 253 White (40.1%) patients. Mean BREAST-Q Adverse Effects of Radiation score was worse for AIAN patients (-22.2; 95% CI, -39.9 to -4.6; P = .01), Black patients (-10.8; 95% CI, -16.1 to -5.5; P < .001), and Hispanic patients (-7.8; 95% CI, -13.0 to -2.5; P = .004) compared with White patients, age <50 compared with ≥65 (effect size -8.6; 95% CI, -14.0 to -3.2; P = .002), less than a college education (-5.8; 95% CI, -10.0 to -1.6; P = .01), bra cup size of D/E versus A/B (-5.3; 95% CI, -9.9 to -0.65; P = .03), and current smokers (-11.3; 95% CI, -18.3 to -4.2; P = .002). AIAN, Black, and Hispanic patients reported worse changes in skin pigmentation, telangiectasias, dryness, soreness, and/or irritation compared with White patients.
Conclusions: AIAN, Black, and Hispanic patients reported substantially worse long-term breast and skin QOL outcomes after radiation therapy. Additional work is needed to understand these differences and how to alleviate them.
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