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A pathologic primary tumor TNM stage finding. The definition of pT1 stage finding depends on the particular type of cancer that it refers to; for example, for breast cancer, pT1 stage finding is defined as follows: cancer with tumor size 2.0 cm or less in greatest dimension; for colorectal cancer, pT1 stage finding is defined as follows: cancer with invasion into the submucosa. (from AJCC 6th and 7th Eds.)
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