A 50-year-old woman is diagnosed with a 0.8 cm, grade 1, ER-positive, HER2-negative invasive ductal carcinoma. Sentinel lymph node biopsy is negative. According to the AJCC 8th edition staging system, what is the anatomic stage group?
- A Stage 0
- B Stage IIA
- C Stage IA ✓
- D Stage IIB
Correct answer: C. Stage IA
Explanation
A tumor ≤2 cm (T1) with no nodal involvement (N0) and no distant metastasis (M0) is classified as Stage IA. Stage 0 is DCIS. Stage IIA includes T0-1N1M0 or T2N0M0. Stage IIB is T2N1M0 or T3N0M0. The size of 0.8 cm falls under T1, and with N0M0, the stage is IA.
Reference: AJCC Cancer Staging Manual, 8th ed.
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