A 60-year-old woman presents with a 2 cm tumor located on the right buccal mucosa. There is no evidence of regional lymph node involvement or distant metastasis. What is the appropriate TNM classification for this tumor?

Explanation

The tumor measures 2 cm, which corresponds to T1 (tumor ≤2 cm). Since there is no regional lymph node involvement, the N stage is N0. Additionally, no distant metastasis is present, so M0 applies. Therefore, the TNM stage is T1 N0 M0.