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Facts about the skin from DermNet New Zealand Trust. Topic index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Basal cell naevus syndrome

Are you a person who has Basal Cell Carcinoma Nevus Syndrome (BCCNS)? If so, please participate in Ameriderm's Basal Cell Nevus Syndrome Survey.

Basal cell naevus syndrome (BCNS) or basal cell carcinoma nevus syndrome (BCCNS) is also known as Gorlin-Goltz syndrome, Gorlin syndrome, and nevoid basal cell carcinoma syndrome. The so-called basal cell naevi are actually tiny basal cell carcinomas.

What is basal cell naevus syndrome?

Basal cell naevus syndrome is a rare inherited condition characterised by:

Developmental abnormalities in affected individuals may include:

Basal cell naevus syndrome
Numerous basal cell carcinomas
Basal cell naevus syndrome
Multiple scars from cryotherapy
Basal cell naevus syndrome
Palmar pits
Basal cell naevus syndrome

What is the cause of basal cell naevus syndrome?

Basal cell naevus syndrome is due to an abnormal PTCH (patched) gene on chromosome 9q22.3-q31. This gene normally functions as a tumour suppressor so when it is not working properly it may allow cancers to grow.

Basal cell naevus syndrome is an autosomal dominant condition meaning half of an affected person's children also have the syndrome. It affects one in every 50 to 100,000 people.

Recent research is studying how the genetics of basal cell carcinoma may lead to effective treatments in the future.

How is the diagnosis made?

A diagnosis of basal cell naevus syndrome can be made if there are 2 major or 1 major and 2 minor criteria.

Major criteria

Minor criteria

Basaloid follicular hamartoma has also been linked to a mutation in the patched gene but is a benign tumour. There are solitary and multiple hereditary variants.

What is the treatment for basal cell naevus syndrome?

The first sign of basal cell naevus syndrome may be the development of a medulloblastoma in a child aged 2 to 5 years, but luckily this is uncommon. Only a few children with medulloblastoma also have basal cell naevus syndrome. If detected early enough, the tumour may be treated by surgery and chemotherapy.

Patients with basal cell naevus syndrome often require surgery to remove jaw cysts in their 20s. Often, it is not until they are in their 30s or 40s that the basal cell carcinomas begin to appear so the diagnosis of the syndrome is often delayed.

All patients with basal cell naevus syndrome should see a dermatologist for regular skin examinations so that basal cell carcinomas can be treated when they are small. This may require surgery or one of the many other treatments available for these tumours including cryotherapy, photodynamic therapy, fluorouracil cream and imiquimod cream. They should not receive treatment with irradiation as this is liable to provoke the development of more tumours.

Some patients may require long term treatment with oral retinoids such as isotretinoin or acitretin. Advanced basal cell carcinomas may sometimes be treated with vismodegib.

Sun protection is vital to reduce the number of skin cancers developing but even complete protection will not prevent all basal cell carcinomas in patients with basal cell naevus syndrome.

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Author: A/Prof Amanda Oakley, Dermatologist, Dept of Dermatology, Waikato Hospital, New Zealand.

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