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 Table of Contents  
Year : 2013  |  Volume : 5  |  Issue : 9  |  Page : 499-504

The presentation, pathology, and current management strategies of cutaneous metastasis

Department of Dermatology, Roswell Park Cancer Institute, University at Buffalo, Buffalo, New York, USA

Date of Web Publication26-Sep-2013

Correspondence Address:
Christina Yin Bin Wong
66 Summer Street, Apt. 6A, Buffalo, New York-14209
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1947-2714.118918

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Skin metastases are rare in the routine clinical practice of dermatology, but are of major clinical significance because they usually indicate advanced disease. We reviewed the literature on skin metastasis regarding recent trends in clinical presentation and diagnosis of the most common cutaneous lesions. An extensive literature review was conducted using PubMed from May 26, 2011 to July 16, 2013 relating cutaneous metastases. Articles chosen for reference were queried with the following prompts: "Cutaneous metastases", "clinical presentation", "histological features", and "immunohistochemistry". Further searches included "treatment" and "management" options for "metastatic breast", "metastatic colorectal", "metastatic melanoma", "metastatic lung", and "hematologic cancers." We also reviewed the literature on the current management of melanoma as a model for all cutaneous metastatic disease. Our own clinical findings are presented and compared to the literature. Additionally, we highlight the most useful immunohistochemical studies that aid in diagnoses. Several novel therapies and combination therapies such as electrochemotherapy, vemurafenib, and imiquimod will be discussed for palliative treatment of cancers that have been found to improve cutaneous lesions. We review these notable findings and developments regarding skin metastases for the general dermatologist.

Keywords: Cutaneous metastasis, Images, Immunohistochemistry, Skin metastasis

How to cite this article:
Wong CY, Helm MA, Kalb RE, Helm TN, Zeitouni NC. The presentation, pathology, and current management strategies of cutaneous metastasis. North Am J Med Sci 2013;5:499-504

How to cite this URL:
Wong CY, Helm MA, Kalb RE, Helm TN, Zeitouni NC. The presentation, pathology, and current management strategies of cutaneous metastasis. North Am J Med Sci [serial online] 2013 [cited 2023 Jun 3];5:499-504. Available from: https://www.najms.org/text.asp?2013/5/9/499/118918

  Introduction Top

Cutaneous metastases are encountered in 0.7-0.9% of cancer patients. [1] They may be the first manifestation of metastatic spread of an internal malignancy [2] or herald cancer recurrence long after treatment of a primary tumor. [3] Patterns of cutaneous metastases vary among women and men. Breast cancer, colorectal cancer, and melanoma frequently metastasize to the skin in women. [4],[5] In men; melanoma, lung cancer, and colorectal cancer are the most common sources of cutaneous metastases. [2],[4] However, such patterns may differ geographically as a study in Taiwan found internal malignancies metastasize to the skin with different frequencies and at rates differing from primarily Caucasian populations. [6],[7] An extensive literature review was conducted using PubMed from May 26, 2011-July 16, 2013 relating cutaneous metastases. Articles chosen for reference were queried with the following prompts: "Cutaneous metastases", "clinical presentation", "histological features", and "immunohistochemistry". Further searches included "treatment" and "management" options for "metastatic breast", "metastatic colorectal", "metastatic melanoma", "metastatic lung", and "hematologic cancers". We review the literature on clinical presentation, diagnosis, and advances in the management.

  Clinical Presentation Top

Cutaneous metastases can present as a great masquerader of underlying disease. A high index of clinical suspicion is critical for diagnosis of skin metastases. Cutaneous metastases may be asymptomatic or be associated with pain and tenderness [Figure 1]a. They frequently present as a rapidly growing painless dermal or subcutaneous nodules with intact overlying epidermis [Figure 1]b-d, [8] but can also mimic an inflammatory dermatosis. [9] Metastases may also present as macules, infiltrated or indurated plaques, discoid lesions, tumor nodules with telangiectasias, bullous or papulosquamous lesions, scarred plaques, or pigmented tumors. [3] While there is no single diagnostic characteristic which predominates; a few patterns have been recognized.
Figure 1: (a) Gingival metastases from a primary chondrosarcoma.(b) Firm nodule at the base of the ear from a primary lung cancer. (c) Two subcutaneous firm nodules in the clavicular fossa from metastatic lung cancer. (d) Isolated firm nodular lesion from metastatic colon cancer

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Metastases originating from breast cancer tend to appear in the anterior chest wall, either from direct extension of underlying tumor or by lymphatic spread [Figure 2]a and [Figure 3]a. Extensive cutaneous involvement of metastatic breast cancer can simulate cellulitis (carcinoma erysipeloides) or a breast-plate of armor ("en cuirasse" pattern). Interestingly, a subset of breast cancer patients has superior prognosis, even among breast cancer patients with stage IV disease. [10]
Figure 2: (a) Cellulitis-like appearance of metastatic breast cancer.(b) Plaque-like area with multiple nodules from a primary breast cancer. (c) Massive recurrence of breast cancer on the chest wall and abdomen of the "en cuirasse" type. (d) Breast cancer, metastatic to the thoracic spine with extension to the skin, and lceration secondary to radiation therapy

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Figure 3: (a) Cellulitic-type appearance with multiple nodules in metastatic breast cancer of the shoulder and upper back. (b) Merkel cell carcinoma reveals neoplastic cells in the dermis. A CAM 5.2 stain reveals perinuclear staining (original magnification, 400×).(c) Metastatic squamous cell carcinoma of the skin reveals neoplastic cells in the dermis (cytokeratin 5/6 stain; original magnification, 100×). (d) Neoplastic cells are noted in the dermis. A HER2/neu stain is positive and decorates the neoplastic cells in the dermis indicating possible metastasis from breast carcinoma (original magnification, 200×)

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While most cancers present as solitary nodules, melanoma and carcinomas with an unknown primary frequently present as multiple nodules. [8] Locoregional melanocytic metastases may be explained by angiotropism, an extravascular migratory phenotype, and an important marker and prognostic factor of metastasis in melanoma. [11] The face and scalp are most commonly affected by metastases, suggesting that blood vessels and patterns of innervation may influence the spread of metastases. [12] These patterns can also been associated with cancers of gastric, pulmonary, prostatic, ovarian, laryngeal, palatine-tonsillar, pancreatic, colorectal, parotid, thyroid, or uterine origin and may suggest local treatments that work for melanoma may also work for other metastatic cutaneous malignancies. [13],[14],[15],[16] Tumors may even metastasize into other tumors, causing diagnostic conundrums. [17] When metastases are suspected, punch or excisional biopsy is indicated for definitive diagnosis.

  Diagnosis and Immunohistochemistry Top

Cutaneous metastases often exhibit histological patterns characteristic of the underlying causative primary tumor. Tumors are identified microscopically as a dermal deposit of pleomorphic cells. Mitotic figures are usually evident and neoplastic cells may be identified within vascular lumina. Although metastases may be comprised of cells which are more undifferentiated than the primary tumor, careful examination usually reveals important clues. For example, melanoma is associated with pigment in at least some of the neoplastic cells in most cases. Squamous cell carcinoma is associated with keratin pearl formation, and adenocarcinomas usually exhibit gland formation. Thyroid cancer may exhibit colloid bodies, colon cancer may be associated with mucinous cells, and other tumors may exhibit telltale clues as to their origin. When confronted with a possible metastasis, comparison with the histologic appearance of any prior malignant neoplasms is usually one of the first steps that may help identify the source. Additionally, studies have indicated the majority of metastatic cancers to the skin are adenocarcinomas. [10],[18] When tumors are poorly differentiated or anaplastic, screening immunohistochemical studies can be very helpful.

[Table 1] identifies immunohistochemical properties of some primary cancers. [19],[20],[21],[22] When neoplastic cells stain with cytokeratin markers such as AE1/AE3 and CAM 5.2, a carcinoma is likely [Figure 3]b. Staining with CD45/leukocyte common antigen (LCA) indicates that neoplastic cells are of lymphoid origin, while S-100, Melan-A, Mart-1, HMB-45, and SOX-10 decorate most melanomas. More detailed immunohistochemical studies [Table 2] can be performed when screening studies and clinical correlation have not been fruitful in identifying a tumor of origin. [23],[24] Although advances in immunohistochemistry are very promising, there is still much work that needs to be done to characterize metastases. [25],[26],[27] A recent letter to the editor highlights the pitfalls that can occur when differentiating primary cutaneous apocrine carcinoma from a metastasis. [28] Although cytokeratin 5/6 is associated with cutaneous apocrine carcinoma, this staining pattern has also been noted with metastatic squamous cell carcinoma [Figure 3]c. Similarly, cytokeratin 7 usually stains metastases diffusely, but is associated with only focal staining in primary adnexal carcinoma, but this pattern is not absolute. [29] Mammaglobin is of interest as it is associated with more widespread staining of metastases than primary apocrine carcinoma, but the results are still preliminary. [30] CD10 staining has been associated with tumor progression. [24] Cyclooxygenase 2 is associated with tumors of the mid-gut (ileum and appendix), gut, colorectal adenocarcinoma as well as gastroesophageal adenocarcinoma. [31] Staining of adenocarcinoma of the lung and endometrioid adenocarcinoma can also occur, highlighting the fact that all immunochemical marker studies must be interpreted in the context of other findings. [31] When an epithelial carcinoma is identified, cytokeratin 7 and 20 stains can provide important useful characterization of tumors. Additional testing can include thyroid transcription factor-1 (TTF-1) and other markers as needed. When clinical appearance, clinical history, and the histologic findings on biopsy are all taken into account, the cause of most skin metastases becomes clear. Unfortunately, there are still many cases that elude precise diagnosis regarding whether a tumor is primary or metastatic. Recent reports have proposed a diagnostic algorithm for metastatic tumors of unknown primary. [25],[26],[27],[32] Until better methods are developed, the biologic behavior becomes the ultimate arbiter in such cases.
Table 1: Screening immunophenotypes of undifferentiated neoplasm

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Table 2: Immunohistochemistry studies for metastatic tumor of unknown origin

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  Current Advances in Prognosis and the Management Top

We recommend excising metastases when surgically feasible and when this will result in a significant decrease in total tumor burden, improve quality of life, or result in increased functionality. Novel treatments have had a profound effect on prolonging the survival and improving quality of life with metastatic cancer. Oftentimes, treatment of the primary cancer with a successful regimen will cause cutaneous lesions to lessen.

Interestingly, the abscopal response represents an unusual response to radiation therapy in which radiation of a tumor causes untreated distant skin lesions to dissipate without recurrence. [33] The pathophysiology and mechanism of the abscopal effect have not been well-defined, but one study used monoclonal antibodies to analyze infiltrating lymphocytes and suggested that the abscopal effect was caused by activated cellular immunity. [34] The abscopal response has been reported with treatment of melanoma, Merkel cell carcinoma, hematologic, and solid tumors. [33]

The study of effective local treatments for melanoma may serve as a model for other malignancies that disseminate via lymphatics and the blood stream to the skin. For melanomas, we typically excise isolated metastases with a 1 cm margin of normal skin, understanding that there are no evidence based studies looking at the utility of margins for metastatic disease. In areas of high cosmetic importance or when therapy is limited to palliation, we sometimes perform excisions with very limited margins. Therapy for patients with widespread cutaneous and subcutaneous metastases of advanced melanoma that are nonresectable is limited to other types of palliative therapy. Options include radiotherapy, systemic chemotherapy, polychemotherapy, isolated limb perfusion, interferon alpha injections, cryotherapy, laser ablation, or radiofrequency ablation. [35]

Electrochemotherapy is a novel therapeutic option based on enhanced drug delivery into cancer cells using externally applied electrical fields that increase cell membrane permeability. [36],[37],[38],[39] Using targeted electric pulses on tumor-specific areas, cytotoxicity of cisplatin increased 80 times and bleomycin 8,000 times with a large reduction in systemic side effects. [40],[41] A study comparing tumor nodules treated with electrochemotherapy with cisplatin versus cisplatin alone found at a 124-week follow-up, 77% of control rate of tumor nodules treated with electrochemotherapy was observed compared to 19% for those treated with cisplatin only. [42] Electrochemotherapy is well-tolerated by patients, highly effective with low doses of cisplatin or bleomycin, has a short duration of treatment sessions, insignificant side effects, and is more cost-effective than isolated limb perfusion, radiotherapy, interferon-alpha, and hyperthermia associated with radiotherapy and chemotherapy. [42],[43],[44]

Oncogene-targeted therapy for metastatic melanoma using vemurafenib (PLX4032) for melanoma associated with a mutation of the BRAF gene V600 mutation results in complete or partial tumor regression in the majority of patients with an estimated median progression-free survival of more than 7 months. [45] Side effects include arthralgia, rash, nausea, photosensitivity, fatigue, cutaneous squamous-cell carcinoma, pruritus, and palmoplantar dysesthesia. [45]

Imiquimod 5% cream has also been used successfully in the treatment of metastatic melanoma that is difficult to remove by surgery. In one report, a 58-year-old woman with a superficial spreading melanoma with a Breslow thickness 0.75 mm was treated with wide local excision followed by flap reconstruction. Melanoma reemerged 14 months later that was treated with wide local excision followed by split-thickness graft repair. The patient was enrolled in a melanoma peptide vaccine trial 5 months later without improvement. [46] Twenty-one months later, the patient was treated with imiquimod 5% cream and histopathologic evaluation revealed regression of the widespread cutaneous metastases after 6 months of imiquimod. [46]

  Conclusion Top

Cutaneous metastases can be the first sign of tumor metastases. Any change in the skin should raise the suspicion of metastases in the correct clinical context. Biopsy is mandatory in patients with a history of cancer or those with at high risk of cancer. Immunohistochemical screening methods continue to improve and assist in diagnosing the primary tumors of origin. Immunohistochemical findings can also help direct treatment options. With advances in novel therapies that prolong survival, prompt recognition of cutaneous metastases can help greatly in reducing morbidity and mortality.

  References Top

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  [Figure 1], [Figure 2], [Figure 3]

  [Table 1], [Table 2]

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