TMN
(tumor, node, metastases)
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Primary Tumor
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TX
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Primary tumor cannot be assessed.
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T0
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No evidence of primary tumor.
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T1
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Tumor not palpable nor visible by imaging.
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T1a
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Tumor incidental histologic finding in 5% or less of tissue resected.
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T1b
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Tumor incidental histologic finding in more than 5% of tissue resected.
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T1c
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Tumor identified by needle biopsy. (e.g. because of elevated PSA).
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T2
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Tumor confined within prostate.*
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T2a
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Tumor involves one lobe.
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T2b
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Tumor involves both lobes.
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*Note: Tumor found in one or both lobes by needle biopsy, but not palpable or reliably visible by imaging in classified as T1c.
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T3
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Tumor extends through capsule.**
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T3a
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Tumor extends on one or both sides.
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T3b
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Tumor invades seminal vesicle.
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**Note: Invasion into the prostatic apex or into (but not beyond) the prostate capsule is not classified as T3, but as T2.
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T4
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Tumor is fixed or invades adjacent structures other than seminal vesicles: bladder neck, external sphincter, rectum, levator muscles, and/or pelvic wall.
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Regional Lymph Nodes (N)
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NX
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Regional lymph nodes cannot be assessed.
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N0
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No regional lymph node metastasis.
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N1
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Metastasis in regional lymph node(s).
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Metastases (M)
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MX
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Distant metastasis cannot by assessed.
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M0
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No distant metastasis.
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M1
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Distant metastasis.
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M1a
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Nonregional lymph node(s).
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M1b
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Bone(s).
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M1c
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Other site(s).
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