Review
Intralesional agents in the management of cutaneous malignancy: A review

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Intralesional agents have a role in the management of cutaneous malignancies. In this article, the efficacy, side effects, strengths, limitations, costs, and practical considerations regarding the use of intralesional agents to treat basal cell carcinoma, squamous cell carcinoma, selected cutaneous lymphomas, and even metastatic melanoma are reviewed. Intralesional administration of 5-fluorouracil, interferon, interleukin-2, bleomycin with electrochemotherapy, and aminolevulinic acid with photodynamic therapy are discussed as treatment modalities in basal cell carcinoma. Interferon (∼1.5 M IU, 3 times weekly × 3 weeks) is perhaps the most widely used regimen for basal cell carcinoma. With regard to squamous cell carcinoma, treatment with 5-fluorouracil, methotrexate, interferon, and bleomycin are reviewed. Methotrexate (∼0.3-2.0 mL of 12.5 or 25 mg/mL, two injections ∼2 weeks apart) was perhaps the most widely used agent. Interferon (3 M IU × 3 times weekly for ∼8.5 weeks) and rituximab (10-30 mg per lesion, 3 times weekly for 1 week, possibly repeated 4 weeks later) are sometimes used in the management of primary cutaneous B-cell lymphomas, whereas in primary cutaneous CD30+ lymphoma intralesional methotrexate (0.4-0.5 mL of 50 mg/mL weekly for 2 weeks) has been used. Finally, the roles of BCG vaccine, cidofovir, rose bengal, and bleomycin with electrochemotherapy for the palliation of metastatic melanoma are reviewed. Intralesional management appears most useful when surgical intervention is not a viable option, for cases in which the cosmetic outcome may be superior, or for situations in which the side effects from systemic chemotherapeutic agents are to be minimized.

Section snippets

Basal cell carcinoma

BCC is the most common cancer of mankind, comprising over 80% of nonmelanoma skin cancer diagnoses.1, 2 Excision or curettage and electrodessication are often used for treatment of BCC, and are cost-effective with low rates of recurrence. Micrographic surgery claims the lowest recurrence rate, but it is labor-intensive, expensive, and sometimes, geographically restricted. Because surgical or destructive techniques estimate 5-year cure rates to be around 90% for primary BCC, this should be the

Squamous cell carcinoma

SCC is the second most common form of skin cancer in mankind. An estimated 250,000 cases occur annually in the United States, mostly on sun-exposed skin.28 Intralesional therapy focuses on invasive SCC, whereas intraepithelial processes, such as actinic keratosis or SCC in situ (Bowen disease), are more aptly treated with topical modalities.

Keratoacanthoma (KA) is an entity difficult to classify. Initially considered benign, but with a malignant appearance, the concept of KA has blurred, and

Primary cutaneous B-cell lymphomas

Intralesional therapy has been considered for 4 subgroups of primary cutaneous B-cell lymphoma (PCBCL): (1) primary cutaneous follicle-center lymphoma (PCFCL); (2) primary cutaneous marginal zone lymphoma (PCMZL); (3) primary cutaneous diffuse large B-cell lymphoma (PCLBCL), leg type; and (4) PCLBCL, other types.

Speaking generally, PCFCL and PCMZL are associated with an excellent prognosis and have been successfully managed using intralesional agents. PCLBCL leg type maintains a less favorable

CD30+ lymphoproliferative disorders

CD30+ cutaneous lymphoma is the second most common form of cutaneous T-cell lymphoma, superseded only by classic mycosis fungoides. Indeed, over the last several decades, dermatology has recognized a spectrum of disease ranging from lymphomatoid papulosis (classically a “benign” CD30+ disorder) to frank primary cutaneous anaplastic large cell lymphoma (PCALCL). Even for PCALCL, the overall prognosis is generally excellent, with 5-year survival exceeding 90%. Although data are limited to case

Metastatic melanoma

Because depth of invasion is the single most important prognostic factor in melanoma, it would be imprudent to advocate intralesional therapy of a primary melanoma under anything other than the most extraordinary of circumstances. Nevertheless, some investigators have explored the idea of using intralesional agents for control and palliation of metastatic melanoma.

Historically, antiblastics and dinitrochlorobenzene have been used for intralesional management based on strong cytolytic properties.

Conclusion

In sum, a variety of intralesional agents exist to treat common skin malignancies, including: BCC, SCC, some forms of PCBCL and CD30+ T-cell lymphoproliferative disorders, and cutaneous and subcutaneous melanoma metastasis. The intralesional therapies most often used can be seen in Table II. Their costs can be compared in Table III.

Admittedly, management of cutaneous malignancy through the administration of intralesional agents has not been as widely integrated into clinical practice as have

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