Feb 18, 2022 · In T1a breast cancer, the tumor size is less than or equal to 5 millimeters (mm) in T1b, the tumor size is greater than 5 mm, but less than or equal to 10 mm. T1a and T1b breast cancers without lymph node spread have excellent long-term outcomes, with more than 95% of women alive at 10 years.
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