An 88-year-old male with locally advanced basal-cell carcinoma (BCC) of the scalp who had received multiple resections, stem cell graft, and amniotic allograft continued to progress with severe ulcerations that extended into the dura. Patient was initiated on vismodegib 150 mg daily and subsequently developed a diffuse maculopapular rash within 14 days of treatment. The rash resolved with topical triamcinolone 0.1% and discontinuation of vismodegib. Loratadine 10 mg daily was concurrently administered for rash prophylaxis upon vismodegib re-initiation. Within 7 days of therapy, the rash returned, and subsequently vismodegib was discontinued and oral prednisone taper was initiated. Given limited effective treatment options, vismodegib was continued at a modified schedule of 150 mg daily for 2 weeks then 1 week off with prednisone 5 mg daily. To date, patient has completed 2 years of treatment with no return of rash or disease progression.
BCC occurs in 2 million patients annually in the US. Fortunately, most of these cases are responsive to local therapy with rare metastatic progression. The emergence of novel Hedgehog pathway inhibitors (vismodegib, sonidegib) provide effective options for advanced BCC. Although vismodegib has been reported to cause Grade 3-4 adverse events in 25% of patients, there are no reports of vismodegib-induced rash nor recommendations regarding management.
For many novel targeted therapies, the appropriate management of toxicities has not been well described. This case study presents a patient that continues to respond to therapy with a novel modified dosing scheme in addition to low-dose prednisone. We present this case report to offer a potential treatment option in patients who experience a vismodegib-induced rash.
