Basal cell carcinoma medical therapy
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Saarah T. Alkhairy, M.D.
Overview
After the suspicious lesion is evaluated, the medical therapy is divided into low-risk and high-risk basal cell carcinoma patients. Medical therapy consists of surgery, radiation therapy, and follow-up for recurrence.
Basal Cell Carcinoma Medical Therapy
After the suspicious lesion is evaluated, the medical therapy is divided into low-risk and high-risk basal cell carcinoma patients.
The table below summarizes the characteristics in low-risk and high-risk lesions[1].
| H&P | Low Risk | High Risk |
| Location/size | Area L < 20 mm; Area M < 10 mm; Area H < 6 mm | Area L ≥ 20 mm; Area M ≥ 10 mm; Area H ≥ 6 mm |
| Borders | Well defined | Poorly defined |
| Primary vs. recurrent | Primary | Recurrent |
| Immunosuppression | (-) | (+) |
| Site of prior radiation therapy | (-) | (+) |
| Subtype | Nodular, superficial | Aggressive growth pattern |
| Perineural involvement | (-) | (+) |
Area H = “mask areas” of face (central face, eyelids, eyebrows, periorbital, nose, lips [cutaneous and vermilion], chin, mandible, preauricular and postauricular skin/sulci, temple, ear), genitalia, hands, and feet
Area M = cheeks, forehead, scalp, neck, and pre-tibial area
Area L = trunk and extremities (excluding pre-tibial area, hands, feet, nail units, and ankles)
The algorithm below demonstrates a treatment protocol for low-risk lesions[2].
The algorithm below demonstrates a treatment protocol for high-risk lesions[3].
After the primary treatment, a follow-up is performed to evaluate for recurrence of the tumor.
The algorithm below demonstrates a follow-up protocol[4].
The medical therapy for basal cell carcinoma is divided into:
- Toipcal
- Systemic
Topical therapy
- Imiquimoid
- It is an immunomodulatory agent that binds to toll-like receptor 7 and induces the release of pro-inflammatory cytokines including IFN-alpha, TNF-alpha and IL-12.
- It is approved as a 5% cream for treatment of small (<7.25 cm²) superficial BCC and is applied nightly five times a week for six weeks.
- The complete cure rate was around 80%.
- Photodynamic therapy
- The other available option for BCC is photodynamic therapy (PDT) with 5-amino levulinic acid or with its methyl ester plus red light.
- The MAL cream is applied to the tumor and covered with an occlusive dressing for three hours.
- The tumor cells then form increasing amounts of protoporphyrin IX, which is stimulated by irradiation with red light to form reactive oxygen species which are in turn cytotoxic.
- It should be repeated after 1–4 weeks.
- The achieved complete remission is expected to be 92%.
- The main disadvantages of PDT are the pain during the irradiation and the local inflammatory reaction (erythema, erosions, pustules, and crusts).
- 5-flurouracil
- It is a cytostatic agent which is available as a 5% prescription cream that is designed to be applied twice daily for 3–12 weeks until erosions develop.
Systemic therapy
- Hedgehog pathway inhibitors(vismodegib,sonidegib)
- They are markedly teratogenic and embryotoxic.
- The commonest adverse effects of vismodegib include muscle cramps, hair loss, taste disturbances and weight loss.