Stage I Lung Squamous Cell Carcinoma AJCC v7

**Semantic type:** Neoplastic Process

**Definition:** Stage I includes: IA: (T1a, N0, M0); (T1b, N0, M0) and IB: (T2a, N0, M0). T1a: Lung cancer with a tumor size of 2 cm or less n greatest dimension, surrounded by lung or visceral pleura and without bronchoscopic evidence of invasion more proximal than the lobar bronchus (i.e., not in the main bronchus). The uncommon superficial tumor of any size with its invasive component limited to the bronchial wall, which may extend proximal to the main bronchus, is also classified as T1a. T1b: Lung cancer with a tumor size more than 2 cm but 3 cm or less in greatest dimension, surrounded by lung or visceral pleura and without bronchoscopic evidence of invasion more proximal than the lobar bronchus (i.e., not in the main bronchus). T2a: Lung cancer with a tumor size more than 3 cm but 5 cm or less in greatest dimension. N0: No regional lymph metastasis. M0: No distant metastasis. (AJCC 7th ed.)

**Synonyms:** - Stage I Epidermoid Cell Carcinoma of Lung - Stage I Epidermoid Cell Carcinoma of the Lung - Stage I Epidermoid Cell Lung Carcinoma - Stage I Squamous Cell Carcinoma of Lung - Stage I Squamous Cell Carcinoma of the Lung - Stage I Squamous Cell Lung Cancer - Stage I Squamous Cell Lung Carcinoma - Stage I Squamous Cell Lung Carcinoma AJCC v7