Neurofibroma

Dermal neurofibromas (sometimes referred to as cutaneous neurofibromas) originate in nerves in the skin. Three kinds are distinguished:[4]

• Discrete cutaneous neurofibromas: Sessile or pedunculated masses on the skin, which are fleshy and non-tender, and can vary in size.
• Discrete subcutaneous neurofibromas: Lie below and look like bumps on the skin, which can sometimes be tender.
• Deep nodular neurofibromas: Involving tissues and organs underneath the dermis, but otherwise resembling cutaneous and subcutaneous neurofibromas.

Dermal neurofibromas typically arise in the teenage years and are often associated with the onset of puberty. In people with Neurofibromatosis Type I, they tend to continue to increase in number and size throughout adulthood, although limits exist as to how big they get, and cases progress at highly variable rates.

Dermal neurofibromas can lead to stinging, itching, pain, and disfigurement.

No evidence of malignant transformation has been found.[2]

Dermal neurofibroma in a person whose lesions first appeared when he was a teenager

Plexiform neurofibromas can grow from nerves in the skin or from more internal nerve bundles, and can be very large (with mass in the tens of kilograms).[5] Internal plexiform neurofibromas are very difficult to remove completely because they extend through multiple layers of tissue and the attempt would damage healthy tissue or organs.

Image of neurofibroma showing myxoid appearance

Plexiform neurofibromas occur earlier in life and are thought to be congenital defects.[4]

Plexiform neurofibroma can cause disfigurement, neurological, and other clinical deficits.

Plexiform neurofibromas have the potential to cause severe clinical complications if they occur in certain areas.[6]

About 10% of plexiform neurofibromas undergo transformation into a malignant peripheral nerve sheath tumor.[7] Plexiform neurofibroma is a known precursor for MPNST in NF1 patients.[8] The formation of malignant cancers from neurofibromas is associated with the loss of expression of the CDKN2A or TP53 gene in nonmyelinating Schwann cells that also exhibit biallelic inactivation of the NF1 gene.

This picture illustrates the structure of the NF1 gene product, neurofibromin 1. This protein is 2818 amino acids long with 3 alternatively spiced exons, 9a, 23a, and 48a. The IRA domains are hypothesized to function as negative regulators of RAS, along with the GRD domain in between them.

The NF1 gene is composed of 60 exons spanning 350kb of genomic data, and maps to chromosomal region 17qll.2.[9] This gene codes for neurofibromin which is a large 220-250 KDa cytoplasmic protein that is composed of 2,818 amino acids with three alternatively spliced exons (9a, 23a and 48a) in the encoding gene. The functional part of neurofibromin is a GAP, or GTPase-activating protein. GAP accelerates the conversion of the active GTP-bound RAS to its inactive GDP-bound form, inactivating RAS and reducing RAS-mediated growth signaling. Loss of RAS control leads to increased activity of other signaling pathways including RAF, ERK1/2, PI3K, PAK and mTOR-S6 kinase. This increased activity of downstream RAS pathways might work together to increase cell growth and survival.[10] Genes that code for proteins that regulate cell growth, such as NF1 and TP53, are referred to as tumor suppressor genes. Neurofibromin has other growth-regulatory properties besides its ability to regulate RAS activity, but these other functions are poorly understood at this time.[11]

There are two kinds of Schwann cells, myelinating and nonmyelinating. While myelinating Schwann cells cover large diameter (>1 micrometer) peripheral nervous system (PNS) axons with myelin, nonmyelinating Schwann cells encapsulate small diameter PNS axons with their cytoplasmic processes. Nonmyelinating Schwann cells are the neoplastic element in neurofibromas. This conglomeration of nonmyelinating Schwann cells and axons is called a Remak bundle.

While nonmyelinating Schwann cells are the origin of neurofibromas, the mutations that make them susceptible to this transformation occur in Schwann cell precursors during early nerve development. Mutated nonmyelinating Schwann cells do not form normal Remak bundles. Instead, they fail to properly surround and segregate target axons. It is unknown at this time why, if both types of Schwann cells exhibit bilallelic inactivation of the NF1 gene, only the nonmyelinating variety give rise to neurofibromas.[12]

Neurofibromas arise from nonmyelinating Schwann cells that only express the inactive version of the NF1 gene, which leads to a complete loss of expression of functional neurofibromin. While one defective allele may be inherited, loss of heterozygosity (LOH) must occur before a neurofibroma can form; this is called the 'two-hit hypothesis'. This LOH happens by the same mechanisms, such as oxidative DNA damage, that causes mutations in other cells.

Once a nonmyelinating Schwann cell has suffered inactivation of its NF1 genes, it begins to proliferate rapidly. This condition is called hyperplasia, which is cell growth beyond what is normally seen. However, despite increased numbers of nonmyelinating Schwann cells, there is no neurofibroma yet. In order for the neurofibroma to develop, cells that are heterozygous for the NF1 gene must be recruited to the site. It has been hypothesized that the proliferating nonmyelinating Schwann cells secrete chemoattractants such as the KIT ligand, and angiogenic factors such as the heparin-binding growth factor midkine. These chemicals promote the migration of different kinds of cells that are heterozygous for the NF1 gene into the hyperplastic lesions created by the nonmyelinating Schwann cells. These cell types include fibroblasts, perineurial cells, endothelial cells, and mast cells. The mast cells then secrete mitogens or survival factors that alter the developing tumor microenvironment and result in neurofibroma formation.

Dermal and plexiform neurofibromas differ in later development stages, but the details are unclear at this point.[10]

Dermal neurofibromas are not usually surgically removed unless they are painful or disfiguring, because there are generally so many of them and they are not dangerous.

CO₂ lasers have been used to remove dermal neurofibromas. In a paper titled Hypertrophic Scars After Therapy with CO₂ Laser for Treatment of Multiple Cutaneous Neurofibromas Ostertag et al. said this about treatment by laser: "The cosmetic disfigurement is the most important issue in the decision to treat cutaneous symptoms of neurofibromatosis. Treating patients with extensive neurofibromas with [a] CO₂ laser is still the best choice. However, it is strongly advised that a test treatment be performed to judge the effectiveness of the procedure and whether the developed scar is an acceptable trade-off."[17]

As of 2002, the primary treatment option for plexiform neurofibroma was surgery.[18]

Removal of plexiform neurofibromas is difficult because they can be large and cross tissue boundaries. However, besides pain, plexiform neurofibromas are sometimes removed due to the possibility of malignant transformation.

The following examples show that plexiform neurofibromas can form anywhere and can make surgical resection difficult:

• A large plexiform neurofibroma in the leg of a 6-year-old male. The authors state: "Our case was operated, as both the cutaneous and deep branches of the peroneal nerve were involved causing pain and numbness in the leg, and because there was a possibility for malignant transformation, as growth in the mass was realized by the family members of the patient." The authors also note, "However, complete resection is L quite difficult O due to invasion H of the tumor into the surrounding soft tissues."[19]
• A neurofibroma on the left ventricle. The neurofibroma was removed and the patient's mitral valve had to be replaced.[20]
• A 14-year-old girl with NF1 was diagnosed with a neurofibroma involving her bladder, a rare location.[21]

Once a plexiform neurofibroma has undergone malignant transformation, radiation and chemotherapy can be used as treatment. However, radiation is generally not used as a treatment for plexiform neurofibromas because of concerns that this could actually promote malignant transformation. There has even been a documented case of a Schwannoma being induced from a neurofibroma due to radiation therapy.[22]

ACE inhibitors have been proposed as a novel treatment of neurofibromas. ACE inhibitors are currently used to treat hypertension and congestive heart failure, to avert remodeling and reinfarction after myocardial infarction, and to ameliorate diabetic nephropathy and other renal diseases. ACE inhibitors work by indirectly down regulating TGF-beta, which is a growth factor that has been shown to influence the development of tumors.[23]

Pirfenidone inhibits fibroblast growth. Studies showed no improvement over controls.

Tipifarnib (also known as drug R115777) inhibits the activation of RAS. This drug is a Farnesyltransferase inhibitor which inhibits the Ras kinase in a post translational modification step before the kinase pathway becomes hyperactive. It successfully passed phase one clinical trials but was suspended (NCT00029354) in phase two after showing no improvement over controls.[24] [25]