A 60-Year-Old Woman Treated for RCC Develops a Nonpruritic, Slightly Tender Cutaneous Eruption
A 60-year-old woman developed metastatic renal cell carcinoma and was given oral sorafenib (400 mg twice daily) as management for advanced disease when first-line treatment of bevacizumab (Avastin) plus interferon alfa-2a failed to halt progression. She initially developed moderate diarrhea, but otherwise tolerated sorafenib. However, 3 weeks after commencing treatment, the patient became febrile without signs of localized infection and rapidly developed a nonpruritic, slightly tender cutaneous eruption. The latter consisted of scattered, round erythematous patches and plaques with central dark, pseudovesicular centers. The skin eruption was accompanied by swollen, fissured lips. Family history, past medical history, and social history were unremarkable or not pertinent.
D. Erythema multiforme caused by sorafenib
Sorafenib tosylate (Nexavar), an oral targeted antineoplastic agent, interrupts oncogenic pathways by interfering with a variety of cellular kinases. Such inhibition leads to a blockade of cellular proliferation, a reduction of tumor-induced angiogenesis, and an increase in cellular apoptosis. The drug is currently approved in the United States for the treatment of advanced renal cell carcinoma, and it may be especially useful when other, more traditional, regimens have failed.[2-4] While a number of serious systemic adverse events have occasionally been reported, the agent is well tolerated overall.
Cutaneous toxicity, however, is relatively common, perhaps even approaching 90%, in patients receiving this medication. The most frequent skin side effects include: a nonspecific maculopapular rash (34%), hand-foot syndrome (27% to 60%), initial appearance or worsening of psoriasis, facial erythema with or without edema, erythema multiforme, subungual splinter hemorrhages, stomatitis, alopecia, xerosis, eruptive nevi, inflammation of existent seborrheic keratoses, and induction of premalignant and malignant skin tumors.[5,6]
Of these many cutaneous side effects, erythema multiforme is among the rarest, affecting an estimated < 0.1% of treated European and American patients.[7-9] Following resolution, deliberate rechallenge has verified the direct causative relationship between sorafenib and erythema multiforme.[8,10] Interestingly, pharmacogenomics might well play a role in determining susceptibility to this uncommon side effect, as 20-month postmarketing surveillance data demonstrated a 3.7% incidence of sorafenib-induced erythema multiforme in Japan. All cases reported to date have been rather typical in clinical morphology, and all have demonstrated perivascular lymphocytic infiltrates and necrotic keratinocytes on biopsy of involved skin. Treatment consists of discontinuation of sorafenib, along with short-term administration of systemic corticosteroids. No case to date has progressed to toxic epidermal necrolysis.
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