Her family was told she had only weeks to live. Yet Katie O., known online as My Melanoma World, is now more than 11 years cancer-free after a forearm mole led to melanoma that reached her brain, lung and uterus.

She was diagnosed at 25, and the cancer returned multiple times over the years that followed. Her story is a stark reminder that skin cancer can spread to other organs and become life-threatening.

From Forearm Mole to Stage 4

Katie wrote that she thought tanning was safe and knew nothing about melanoma at diagnosis. Her cancer began as stage 2A melanoma on her left forearm and later progressed to stage 4 metastatic disease.

Since 2006, she has undergone 18 surgeries, three chemotherapies, three immunotherapies, extensive radiation and a double-blind clinical trial. Melanoma also took away her ability to have children.

In 2008, two weeks after her second daughter was born, the cancer returned in her left armpit after two years with no evidence of disease. Months later, it spread to her right lung, brain and uterus.

After another surgery, Katie was told she had weeks to live. Hope led her family to Disneyland, and her treatment later began working.

She described chronic pain, neuropathy and scan anxiety. Survivorship does not mean a return to normal, as skin checks and scars remain.

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How Metastatic Melanoma Spreads

Metastatic melanoma, also called advanced melanoma, means the cancer has moved beyond the primary tumour. Stage 3 involves lymph nodes or nearby skin, while stage 4 means other organs are affected.

Research cited in Maedica found lymph node involvement in 50 to 75 per cent of people with metastatic melanoma. Lung spread occurs in 70 to 87 per cent, and liver involvement in 54 to 77 per cent.

Brain metastasis occurs in 36 to 54 per cent of people with metastatic melanoma, and bone spread in 23 to 49 per cent. Melanoma that spreads to the brain can cause symptoms such as headaches, seizures and memory problems.

Melanoma can recur years after an early-stage diagnosis. One study found that 46 per cent of patients who progressed from early-stage melanoma to stage 4 disease did so within three years, although later recurrences were also observed.

Warning Signs of Spread

Cancer Research UK says general symptoms of advanced melanoma may include hard or swollen lymph nodes, a hard lump on the skin, unexplained pain, feeling very tired or unwell and unexplained weight loss. Symptoms depend on where the cancer has spread.

Lung spread can bring a persistent cough, breathlessness or coughing up blood. Bone spread can cause constant pain and weaker bones that break more easily.

Survival Falls as Cancer Spreads

Data from 2015 to 2021 show a five-year melanoma survival rate of 95 per cent across all stages in the US, according to SkinCancer.org. For melanoma detected early, the estimated rate exceeds 99 per cent.

The five-year relative survival rate is 76 per cent when melanoma has spread to nearby structures or lymph nodes and 35 per cent when it has spread to distant parts of the body. The outlook shifts sharply once melanoma leaves the skin.

Prevention and Early Detection

Katie once thought tanning was safe, but using a tanning bed before the age of 35 has been associated with a 75 per cent higher risk of developing melanoma. On average, having more than five sunburns also doubles a person's risk.

Regular daily use of sunscreen with an SPF of 15 or higher reduces melanoma risk by 50 per cent. After treatment, patients may be monitored more closely for two to five years for signs of spread.

Her daughters are now 23 and 18, and Katie shares education and support through My Melanoma World and the Stop Melanoma Movement. Her message is clear: 'Melanoma changed my life, but it did not define me.'

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