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Melanoma



Melanoma is the fourth most common cancer diagnosed in Australia1, which along with New Zealand has the world's highest incidence rate for melanoma.


Incidence and mortality

In 2010, 11,405 new cases of melanoma were diagnosed in Australia, accounting for nearly one in ten cancer diagnoses.

Melanoma is more commonly diagnosed in men than women. The risk of being diagnosed with melanoma by age 85 is 1 in 14 for men compared to 1 in 24 for women.

In Australia in 2011, there were 1544 deaths due to melanoma.

Melanoma is the sixth most common cause of cancer death in Australian men and tenth most common in Australian women.


Screening

Individuals at high risk of melanoma (see risk factors below) should be taught to check their skin for irregular or changing lesions, and have annual checks by a dermatologist.


Symptoms and diagnosis

Often melanoma has no symptoms, however it can be associated with changes that relate to ‘ABCDE’ - Asymmetry, irregular Border, uneven Colour, Diameter (usually over 6mm), Evolving (changing and growing). Other symptoms include dark areas under nails or on membranes lining the mouth, vagina or anus.

Diagnosis is by biopsy to remove the whole lesion.

Download Cancer Council's skin cancer identification poster to help identify potential skin cancers.Melanoma poster


Staging

If the excised lesion is thick, a biopsy of the first draining lymph node (sentinel node) is performed. The most important feature of a melanoma in predicting its outcome is its thickness (stage 0 is less than 0.1mm, stage I less than 2mm, stage II greater than 2mm, stage III spread to lymph nodes and stage IV distant spread). The presence of ulceration also predicts a poor outcome. If distant spread is suspected, CT scans of the chest, abdomen and pelvis are performed. The blood test LDH can sometimes be useful to assess metastatic disease.


Causes

Melanoma risk increases with exposure to UV radiation, particularly with episodes of sunburn (especially during childhood).

Melanoma risk is increased for people who have:

  • increased numbers of unusual moles (dysplastic naevi)
  • depressed immune systems
  • a family history of melanoma in a first degree relative
  • fair skin, a tendency to burn rather than tan, freckles, light eye colour, light or red hair colour
  • had a previous melanoma or non-melanoma skin cancer.

Prevention 

Avoid sunburn by minimising sun exposure when the SunSmart UV Alert exceeds 3 and especially in the middle of the day when UV levels are most intense. Seek shade, wear a hat that covers the head, neck and ears, wear sun protective clothing and close-fitting sunglasses, and wear an SPF30+ sunscreen. Avoid using solariums (tanning salons).


Treatment

Surgery can be curative for thin melanomas and requires that the melanoma be removed with at least 1–2cm of normal skin around it. If the draining lymph nodes are involved they are removed.

For thick melanomas some cancer centres offer high dose interferon after surgery, however many offer clinical trials of vaccines because there is no routine therapy mandated. Surgery should be the mainstay of treating relapsed melanoma if it is possible to remove all of the disease.

For widespread disease, chemotherapy is borderline effective and drugs such as dacarbazine can palliate symptoms, as can biologicals like interferon or interleukin 2. Radiotherapy may palliate local symptoms.


Prognosis

An individual’s prognosis depends on the type and stage of cancer, as well as their age and general health at the time of diagnosis. Five year survival for people diagnosed with melanoma is 91%, rising to 99% if the melanoma is detected before it has spread. If spread is within the region of the primary melanoma, the five year survival is 65%, dropping to 15% if the disease is widespread.

For more information, contact Cancer Council 13 11 20 (cost of a local call).

1) Excluding non-melanoma skin cancer, which is the most commonly diagnosed cancer according to general practice and hospitals data, however there is no reporting of cases to cancer registries.

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For more information

Sources

  • Australian Institute of Health and Welfare 2014. ACIM (Australian Cancer Incidence and Mortality) Books. Canberra: AIHW.
  • Australian Institute of Health and Welfare & Australasian Association of Cancer Registries 2012. Cancer in Australia: an overview, 2012. Cancer series no. 74. Cat. no. CAN 70. Canberra: AIHW.

 


This page was last updated on: Wednesday, October 15, 2014