Clinical Benefit from Tyrosine Kinase Inhibitors in Metastatic Merkel Cell Carcinoma: A Case Series of 5 Patients

Am J Case Rep. 2018 Apr 30:19:505-511. doi: 10.12659/AJCR.908649.

Abstract

BACKGROUND Merkel cell carcinoma (MCC) is a rare but aggressive neuroendocrine skin cancer. The estimated 5-year survival of patients with metastatic disease is approximately 14%. Cytotoxic chemotherapy is associated with a modest median progression-free survival (PFS) of only 3 months. In recent studies, immunotherapy with anti-PD-1/anti-PD-L1 antibodies has demonstrated a high response rate in immunocompetent patients (>50% in chemotherapy-naïve patients) and responses are typically durable. However, approximately 50% of immunocompetent patients do not respond to immunotherapy. In addition, immunosuppressed patients have limited therapeutic options. Hence, there is a significant unmet need for effective treatments in these subpopulations. CASE REPORT We describe 5 patients (out of 24 total) with metastatic MCC who were treated with a vascular endothelial growth factor receptor (VEGFR) tyrosine kinase inhibitor (TKI), either pazopanib (n=4) or cabozantinib (n=1), with clinical benefit. One patient had a complete response to pazopanib after 3 months of therapy. Four patients had stabilization of disease that lasted from 5 months to 3.5 years. In an immunosuppressed patient with psoriatic arthritis, stabilization of MCC was also associated with improvement in his arthritis that allowed cessation of immunosuppression. Patients did not develop any unusual toxicities from VEGFR-TKIs. CONCLUSIONS Treatment with VEGFR-TKIs demonstrated clinical benefit in this selected small group of patients with metastatic MCC. Prospective investigation of VEGFR-TKIs is warranted in this population, especially in patients with disease refractory to immunotherapy.

Publication types

  • Case Reports

MeSH terms

  • Aged
  • Angiogenesis Inhibitors / therapeutic use
  • Anilides / therapeutic use
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use
  • Carcinoma, Merkel Cell / drug therapy*
  • Carcinoma, Merkel Cell / pathology
  • Humans
  • Indazoles
  • Male
  • Middle Aged
  • Neoplasm Metastasis / drug therapy*
  • Protein Kinase Inhibitors / therapeutic use*
  • Pyridines / therapeutic use
  • Pyrimidines / therapeutic use
  • Skin Neoplasms / drug therapy*
  • Skin Neoplasms / pathology
  • Sulfonamides / therapeutic use

Substances

  • Angiogenesis Inhibitors
  • Anilides
  • Indazoles
  • Protein Kinase Inhibitors
  • Pyridines
  • Pyrimidines
  • Sulfonamides
  • cabozantinib
  • pazopanib