Somatic BRAF c.1799T>A p.V600E Mosaicism syndrome characterized by a linear syringocystadenoma papilliferum, anaplastic astrocytoma, and ocular abnormalities

Am J Med Genet A. 2016 Jan;170A(1):189-94. doi: 10.1002/ajmg.a.37376. Epub 2015 Sep 11.


Genetic mosaicism for somatic mutations of oncogenes is common in genodermatoses, which can be complicated with extra-cutaneous abnormalities. Here we describe an infant with a congenital anaplastic astrocytoma, a linear syringocystadenoma papilliferum, and ocular abnormalities. The BRAF c.1799T>A p.V600E mutation was detected in both the brain and skin tumor cells but not in the blood or normal skin cells, suggesting somatic mosaicsism for the mutation. Clinically, the brain tumor gradually became life threatening without any response to conventional chemotherapies including carboplatin, etoposide, and temozolomide. Vemurafenib, a BRAF p.V600E inhibitor, was administered daily after the detection of the BRAF mutation. This single-agent therapy was dramatically effective against the anaplastic astrocytoma; the tumor regressed, the cerebrospinal fluid cell count and protein levels decreased to normal levels, and hydrocephalus resolved. Moreover, other lesions including a corneal cyst also responded to vemurafenib. The brain tumor continued shrinking after 6 months of treatment. We present a genodermatosis syndrome associated with BRAF c.1799T>A p.V600E mosaicism. This syndrome may represent a new entity in the mosaic RASopathies, partly overlapping with Schimmelpenning-Feuerstein-Mims syndrome, which is driven by mosaicism of HRAS and/or KRAS activating mutations. Screening for BRAF c.1799T>A p.V600E is especially useful for those with malignant tumors, because it is one of the most-druggable targets.

Keywords: BRAF c.1799T>A p.V600E; Schimmelpenning-Feuerstein-Mims syndrome; anaplastic astrocytoma; vemurafenib.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenoma, Sweat Gland / drug therapy
  • Adenoma, Sweat Gland / genetics*
  • Astrocytoma / drug therapy
  • Astrocytoma / genetics*
  • Brain Neoplasms / drug therapy
  • Brain Neoplasms / genetics*
  • Eye / pathology
  • Eye Abnormalities / genetics
  • Humans
  • Indoles / therapeutic use
  • Infant
  • Mosaicism
  • Nevus, Sebaceous of Jadassohn / genetics
  • Premature Birth
  • Proto-Oncogene Proteins B-raf / antagonists & inhibitors
  • Proto-Oncogene Proteins B-raf / genetics*
  • Sulfonamides / therapeutic use
  • Sweat Gland Neoplasms / drug therapy
  • Sweat Gland Neoplasms / genetics*
  • Vemurafenib


  • Indoles
  • Sulfonamides
  • Vemurafenib
  • BRAF protein, human
  • Proto-Oncogene Proteins B-raf