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Lip and Oral Cavity Cancer Treatment (Professional) (cont.)

Stage Information for Lip and Oral Cavity Cancer

The staging systems are all clinical staging and are based on the best possible estimate of the extent of disease before treatment. The assessment of the primary tumor is based on inspection and palpation when possible and by both indirect mirror examination and direct endoscopy when necessary. The tumor must be confirmed histologically, and any other pathologic data obtained on biopsy may be included. The appropriate nodal drainage areas are examined by careful palpation. Information from diagnostic imaging studies may be used in staging. Magnetic resonance imaging offers an advantage over computed tomographic scans in the detection and localization of head and neck tumors and in the distinction of lymph nodes from blood vessels.[1] If a patient relapses, complete restaging must be done to select the appropriate additional therapy.[2,3]

Definitions of TNM

The American Joint Committee on Cancer has designated staging by TNM classification to define lip and oral cavity cancer.[4]

Table 1. Primary Tumor (T)a

a Reprinted with permission from AJCC: Lip and oral cavity. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 29-40.
b Superficial erosion alone of bone/tooth socket by gingival primary is not sufficient to classify a tumor as T4.
TXPrimary tumor cannot be assessed.
T0No evidence of primary tumor.
TisCarcinomain situ.
T1Tumor =2 cm in greatest dimension.
T2Tumor >2 cm but =4 cm in greatest dimension.
T3Tumor >4 cm in greatest dimension.
T4aModerately advanced local disease.b
(Lip) Tumor invades through cortical bone, inferior alveolar nerve, floor of mouth, or skin of face, that is, chin or nose.
(Oral cavity) Tumor invades adjacent structures only (e.g., through cortical bone [mandible or maxilla] into deep [extrinsic] muscle of tongue [genioglossus, hyoglossus, palatoglossus, and styloglossus], maxillary sinus, or skin of face).
T4bVery advanced local disease.
Tumor invades masticator space, pterygoid plates, or skull base and/or encases internal carotid artery.

Table 2. Regional Lymph Nodes (N)a

a Reprinted with permission from AJCC: Lip and oral cavity. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 29-40.
NXRegional lymph nodes cannot be assessed.
N0No regional lymph node metastasis.
N1Metastasis in a single ipsilateral lymph node, =3 cm in greatest dimension.
N2Metastasis in a single ipsilateral lymph node, >3 cm but =6 cm in greatest dimension.
Metastases in multiple ipsilateral lymph nodes, none >6 cm in greatest dimension.
Metastases in bilateral or contralateral lymph nodes, none >6 cm in greatest dimension.
N2aMetastasis in single ipsilateral lymph node, >3 cm but =6 cm in greatest dimension.
N2bMetastases in multiple ipsilateral lymph nodes, none >6 cm in greatest dimension.
N2cMetastases in bilateral or contralateral lymph nodes, none >6 cm in greatest dimension.
N3Metastasis in a lymph node >6 cm in greatest dimension.

Table 3. Distant Metastasisa

a Reprinted with permission from AJCC: Lip and oral cavity. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 29-40.
M0No distant metastasis.
M1Distant metastasis.

Table 4. Anatomic Stage/Prognostic Groupsa

StageTNM
a Reprinted with permission from AJCC: Lip and oral cavity. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 29-40.
0TisN0M0
IT1N0M0
IIT2N0M0
IIIT3N0M0
T1N1M0
T2N1M0
T3N1M0
IVAT4aN0M0
T4aN1M0
T1N2M0
T2N2M0
T3N2M0
T4aN2M0
IVBAny TN3M0
T4bAny NM0
IVCAny TAny NM1

References:

  1. Consensus conference. Magnetic resonance imaging. JAMA 259 (14): 2132-8, 1988.
  2. Harrison LB, Sessions RB, Hong WK, eds.: Head and Neck Cancer: A Multidisciplinary Approach. 3rd ed. Philadelphia, PA: Lippincott, William & Wilkins, 2009.
  3. Wang CC, ed.: Radiation Therapy for Head and Neck Neoplasms. 3rd ed. New York: Wiley-Liss, 1997.
  4. Lip and oral cavity. In: Edge SB, Byrd DR, Compton CC, et al., eds.: AJCC Cancer Staging Manual. 7th ed. New York, NY: Springer, 2010, pp 29-35.
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