borderline significantP = 0.07
This trial showed that the addition of regional nodal irradiation to the supraclavicular lymph nodes, apex of axilla, and internal mammary lymph nodes significantly improved 5-year disease-free survival from 84% to 89.7% ( P = 0.003), and there was also borderline significant improvement of 5-year overall survival from 90.7% to 92.3% ( P = 0.07).