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C03 covers primary malignant neoplasms arising in the gingiva or alveolar ridge mucosa, including the upper gum, lower gum, and gum not otherwise specified. These tumors are classified as oral cavity cancers.
Common Histologies
- Squamous cell carcinoma is by far the most common histology.
- Less common tumors include minor salivary gland carcinomas, mucosal melanoma, and other rare malignancies.
- Malignant odontogenic tumors and primary malignancies of the maxilla or mandible are classified separately.
Common Symptoms
- Persistent gingival ulcer (K12.1), mass (K06.1), thickening (K06.1), or nonhealing extraction site (T81.89XD)
- Bleeding (R58), pain (R52), or loosening of teeth (K08.0)
- Poorly fitting dentures (Z46.3)
- Numbness of the lip or chin (R20.0)
- Trismus or difficulty chewing (M26.52)
- Cervical lymphadenopathy (R59.0)
Early gingival cancers may resemble periodontal or inflammatory dental disease.
Diagnosis
Diagnosis requires clinical oral and neck examination with tissue biopsy. Imaging with contrast-enhanced CT or MRI helps assess invasion of the mandible, maxilla, adjacent oral structures, and regional lymph nodes. Panoramic dental imaging may supplement evaluation of underlying bone. Chest imaging or PET/CT may be used in more advanced disease to assess distant spread or synchronous malignancy.
Staging
Gum cancers are staged using oral cavity TNM criteria. Important features include:
- Primary tumor size and depth of invasion
- Involvement of cortical or medullary bone
- Extension into adjacent oral or facial structures
- Cervical lymph-node involvement, including extranodal extension
- Distant metastasis
Minor superficial erosion of a tooth socket alone does not necessarily establish advanced bone-invasive disease; staging depends on the applicable TNM definitions and full pathologic or radiologic findings.
Molecular Markers
Unlike oropharyngeal squamous cell carcinoma, gingival squamous cell carcinoma is not routinely staged according to HPV or p16 status. In recurrent or metastatic disease, PD-L1 expression may help guide immunotherapy selection. Broader molecular testing may be appropriate for uncommon histologies or when targeted treatment options are being considered.
Common Treatments
Treatment depends on site, extent, nodal risk, histology, and patient factors.
- Surgical resection is commonly used for localized disease.
- Bone involvement may require marginal or segmental mandibulectomy, maxillectomy, or other composite resection.
- Elective or therapeutic neck dissection may be performed according to tumor depth, location, and nodal findings.
- Adjuvant radiation therapy or chemoradiation may be indicated for adverse pathologic features such as positive margins, extranodal extension, advanced primary disease, or nodal involvement.
- Unresectable, recurrent, or metastatic disease may be treated with radiation, systemic therapy, immunotherapy, or symptom-directed palliative care.
Rehabilitation may involve dental care, reconstruction, speech and swallowing therapy, and nutritional support.
Scope Note
C03 identifies the primary anatomic site as the gum, including gingiva and alveolar ridge mucosa; its child codes distinguish upper gum, lower gum, or unspecified gum. It does not encode histologic subtype, TNM stage, grade, depth of invasion, laterality, HPV status, nodal disease, or distant metastasis. Secondary malignant involvement of the gum should not be coded as a primary C03 neoplasm. Malignant odontogenic neoplasms and primary malignancies of the jaw bones are outside this family. Relevant tobacco or alcohol history or disorders may be captured separately when documented.