Isla Sneddon
Isla Sneddon Mairi McGhee/Change.org

Teenager Isla Sneddon died from breast cancer after doctors initially assessed her symptoms as low risk because of her age, raising concerns about how suspected cancer cases in young people are handled.

The 17-year-old from Scotland died in March 2025, six months after being diagnosed with advanced cancer that had spread to her heart, lungs and lymph nodes. She had first reported a lump in her breast at the age of 15 but was not referred urgently for further investigation.

Her parents are now calling for changes to cancer referral guidelines for children and teenagers, arguing that age-based assumptions can delay diagnosis and reduce the chances of effective treatment.

Symptoms Dismissed Due To Age

Isla first noticed a lump in her breast when she was 15 and sought medical advice, according to her family. They say she was told the symptoms were likely to be benign or linked to hormonal changes associated with adolescence.

Despite ongoing pain and repeated visits, her symptoms were not treated with the urgency typically applied to adults presenting with similar signs. Further tests were not ordered at that stage.

When Isla was eventually referred for more detailed examination in 2024, doctors found that the cancer was already advanced. She was told the disease was terminal and that she had only months to live. She died later that year.

Parents Launch Campaign For Reform

Following her death, Isla's parents, Mark and Michelle Sneddon, launched a campaign calling for reforms to cancer referral pathways for under-18s. The campaign, known as 'Isla's Law', is urging health authorities to ensure that suspicious lumps in children and teenagers trigger prompt investigation regardless of age.

The campaign argues that while cancer is statistically less common in younger people, rarity should not prevent timely diagnostic testing when symptoms persist. The family says existing referral guidelines can delay investigation and reduce treatment options, according to STV News.

The campaign has attracted over 35,000 signatures. Isla's parents are due to meet Scotland's Health Secretary, Neil Gray, to discuss potential changes to referral guidance and access to diagnostic services for younger patients.

Early Detection And Clinical Guidance

Breast cancer in teenagers is rare, but NHS guidance states that persistent or unusual breast symptoms should be assessed carefully at any age. Signs that warrant further investigation include ongoing pain, changes in the size or feel of a lump, skin changes and nipple discharge.

Campaigners and clinicians have raised concerns that age-based referral thresholds, while designed to manage risk and resources, can unintentionally deprioritise younger patients with genuine malignancies. They argue that clinical judgement should allow for faster escalation when symptoms do not resolve.

Family Calls For Awareness

Isla's family described her as 'bright, bubbly and full of life'. Her father said they believed they would have more time after her diagnosis, but the disease progressed rapidly.

They say the initial assessment of Isla's symptoms contributed to the late stage at which her cancer was identified. Their aim, they say, is to ensure that no other family faces similar delays because a young person is considered unlikely to have cancer.

The case has renewed discussion about how the NHS and other health systems approach cancer symptoms in children and teenagers. Isla's parents hope their campaign will lead to clearer guidance and faster diagnostic pathways, helping to prevent future deaths linked to delayed diagnosis.

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