Skin Cancer Treatment (PDQ®): Treatment - Health Professional Information [NCI] - Squamous Cell Carcinoma of the Skin Treatment
Localized squamous cell carcinoma (SCC) of the skin is a highly curable disease. There are a variety of treatment approaches to localized SCC, including excision, radiation therapy, cryosurgery, and electrodesiccation and curettage. Mohs micrographic surgery is a form of tumor excision that involves progressive radial sectioning and real-time examination of the resection margins until adequate uninvolved margins have been achieved, avoiding wider margins than needed.
There is little or no good-quality evidence that allows direct comparison of outcomes for patients with sporadic, clinically localized SCCs treated with local therapies. A systematic literature review found only one randomized controlled trial in the management of such patients, and that trial compared adjuvant therapy to observation after initial local therapy rather than different local therapies. In that small single-center trial, 66 patients with high-risk, clinically localized SCC were assigned randomly, after surgical excision of the primary tumor (with or without radiation, depending on clinical judgment), to receive either combined 13-cis-retinoic acid (1 mg/kg orally per day) plus interferon-alpha (3 × 106 U subcutaneously 3 times/week) for 6 months or to observation. In the 65 evaluable patients after a median follow-up of 21.5 months, there was no difference in the combined (primary) endpoint of SCC recurrence or second primary tumor (45% vs. 38%; hazard ratio = 1.13; 95% confidence interval [CI], 0.53–2.41), nor in either of the individual components of the primary endpoint.[Level of evidence 1iiDii]
Metastases at diagnosis are detected in approximately 25% of patients. The prognosis of patients with metastatic disease is poor. Current therapies for patients who present with metastatic disease achieve 6-year event-free survival (EFS) of approximately 28% and overall survival (OS) of approximately 30%.[2,3] For patients with lung/pleural metastases only, 6-year EFS is approximately 40% when utilizing bilateral lung irradiation.[2,4] In contrast, patients with bone/bone marrow metastases have...
Absent high-quality evidence from controlled clinical trials, the management of clinically localized cutaneous SCC is based upon case series and consensus statements from experts. The commonly used treatments are listed below.
Excision is probably the most common therapy for SCC. This traditional surgical treatment usually relies on surgical margins ranging from 4 mm to 10 mm, depending on the diameter of the tumor and degree of differentiation. In a prospective case series of 141 SCCs, a 4-mm margin was adequate to encompass all subclinical microscopic tumor extension in more than 95% of well-differentiated tumors up to 19 mm in diameter. Wider margins of 6 mm to 10 mm were needed for larger or less-differentiated tumors or tumors in high-risk locations (e.g., scalp, ears, eyelids, nose, and lips). Re-excision may be required if the surgical margin is found to be inadequate on permanent sectioning.
Mohs micrographic surgery
Mohs micrographic surgery is a specialized technique used to achieve the narrowest margins necessary to avoid tumor recurrence, while maximally preserving cosmesis. In case series, it has been associated with a lower local recurrence rate than the other local modalities, but there are no randomized trials allowing direct comparison. This surgery is best suited to the management of tumors in cosmetically sensitive areas or for tumors that have recurred after initial excision (e.g., eyelid periorbital area, nasolabial fold, nose-cheek angle, posterior cheek sulcus, pinna, ear canal, forehead, scalp, fingers, and genitalia).[7,8]