Thursday, October 22, 2020

Stages of oropharyngeal cancer…

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The TNM staging system

A staging system is a standard way for doctors to describe and summarize how far a patient’s cancer has spread. The most common system used to describe the extent of oral cavity and oropharyngeal cancers is the TNM system of the American Joint Committee on Cancer (AJCC). The TNM system for staging describes 3 key pieces of information:

  • T indicates the size of the main (primary) tumor and which, if any, tissues of the oral cavity or oropharynx it has spread to.
  • N describes the extent of spread to nearby (regional) lymph nodes. Lymph nodes are small bean-shaped collections of immune system cells to which cancers often spread first.
  • M indicates whether the cancer has spread (metastasized) to other organs of the body. (The most common site of spread is to the lungs. The next most common sites are the liver and bones.)

Numbers or letters appear after T, N, and M to provide details about each of these factors:

  • The numbers 0 through 4 indicate increasing severity.
  • The letter X means “cannot be assessed” because the information is not available.

T categories for cancers of the lip, oral cavity, and oropharynx

TX: Primary tumor cannot be assessed; information not known

T0: No evidence of primary tumor

Tis: Carcinoma in situ. This means the cancer is still within the epithelium (the top layer of cells lining the oral cavity and oropharynx) and has not yet grown into deeper layers.

T1: Tumor is 2 cm (about ¾ inch) across or smaller

T2: Tumor is larger than 2 cm across, but smaller than 4 cm (about 1 ½ inch)

T3: Tumor is larger than 4 cm across. For cancers of the oropharynx, T3 also includes tumors that are growing into the epiglottis.

T4a: Tumor is growing into nearby structures. This is known as moderately advanced local disease.

  • For oral cavity cancers: the tumor is growing into nearby structures, such as the bones of the jaw or face, deep muscle of the tongue, skin of the face, or the maxillary sinus.
  • For lip cancers: the tumor is growing into nearby bone, the inferior alveolar nerve (the nerve to the jawbone), the floor of the mouth, or the skin of the chin or nose.
  • For oropharyngeal cancers: the tumor is growing into the larynx (voice box), the tongue muscle, or bones such as the medial pterygoid, the hard palate, or the jaw.

T4b: The tumor has grown through nearby structures and into deeper areas or tissues. This is known as very advanced local disease. Any of the following may be true:

  • The tumor is growing into other bones, such as the pterygoid plates and/or the skull base (for any oral cavity or oropharyngeal cancer).
  • The tumor surrounds the internal carotid artery (for any oral cavity or oropharyngeal cancer).
  • For lip and oral cavity cancers: the tumor is growing into an area called the masticator space.
  • For oropharyngeal cancers: the tumor is growing into a muscle called the lateral pterygoid muscle.
  • For oropharyngeal cancers: the tumor is growing into the nasopharynx (the area of the throat that is behind the nose).

N categories

NX: Nearby lymph nodes cannot be assessed; information not known

N0: The cancer has not spread to nearby lymph nodes

N1: The cancer has spread to one lymph node on the same side of the head or neck as the primary tumor; this lymph node is no more than 3 cm (about 1¼ inch) across

N2 includes 3 subgroups:

  • N2a: The cancer has spread to one lymph node on the same side as the primary tumor; the lymph node is larger than 3 cm across but no larger than 6 cm (about 2 ½ inches)
  • N2b: The cancer has spread to 2 or more lymph nodes on the same side as the primary tumor, but none are larger than 6 cm across
  • N2c: The cancer has spread to one or more lymph nodes on both sides of the neck or on the side opposite the primary tumor, but none are larger than 6 cm across

N3: The cancer has spread to a lymph node that is larger than 6 cm across

M categories

M0: No distant spread

M1: The cancer has spread to distant sites outside the head and neck region (for example, the lungs)

Stage grouping

Once the T, N, and M categories have been assigned, this information is combined by a process called stage grouping to assign an overall stage of 0, I, II, III, or IV. Stage IV is further divided into A, B, and C.

Stage 0

Tis, N0, M0: Carcinoma in situ. The cancer is only growing in the epithelium, the outer layer of oral or oropharyngeal tissue (Tis). It has not yet grown into a deeper layer or spread to nearby structures, lymph nodes (N0), or distant sites (M0).

Stage I

T1, N0, M0: The tumor is 2 cm (about ¾ inch) across or smaller (T1) and has not spread to nearby structures, lymph nodes (N0), or distant sites (M0).

Stage II

T2, N0, M0: The tumor is larger than 2 cm across but smaller than 4 cm (T2) and has not spread to nearby structures, lymph nodes (N0), or distant sites (M0).

Stage III

One of the following applies:

T3, N0, M0: The tumor is larger than 4 cm across (T3), but it hasn’t grown into nearby structures or spread to the lymph nodes (N0) or distant sites (M0).

OR

T1 to T3, N1, M0: The tumor is any size and hasn’t grown into nearby structures (T1 to T3). It has spread to one lymph node on the same side of the head or neck, which is no larger than 3 cm across (N1). The cancer hasn’t spread to distant sites (M0).

Stage IVA

One of the following applies:

T4a, N0 or N1, M0: The tumor is growing into nearby structures (T4a). It can be any size. It has either not spread to the lymph nodes (N0) or has spread to one lymph node on the same side of the head or neck, which is no larger than 3 cm across (N1). The cancer hasn’t spread to distant sites (M0).

Stage IVB

One of the following applies:

T4b, any N, M0: The tumor is growing into deeper areas and/or tissues (very advanced local disease – T4b). It may (or may not) have spread to lymph nodes (any N). It has not spread to distant sites (M0).

Stage IVC

Any T, Any N, M1: The tumor is any size (any T), and it may or may not have spread to lymph nodes (any N). It has spread to distant sites (M1), most commonly the lungs.

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