You have bowel cancer

Four words you don’t expect to hear when you’re young.
Yet each year over 1,800 young Australians do.

#Never2Young

It is a common misconception that bowel cancer is ‘an old person’s disease’, but the reality is early-onset bowel cancer is on the rise and you should never be told that ”you’re too young to have bowel cancer”.

Although the majority of newly diagnosed bowel cancer cases occur in people aged 50 years and over, 1 in 8 (12.6%) Australians diagnosed with bowel cancer are under the age of 50.

No one knows your body better than you, so listen to it and if something isn’t right make an appointment to speak with your GP as soon as possible. 

At Bowel Cancer Australia, we hear from younger people who have experienced challenges in receiving a diagnosis and who find it hard to get information and support that’s relevant to them.

That is why we launched our Never2Young initiative in 2014, which is leading change for people living with early-onset bowel cancer.

This initiative aims to raise community awareness of early-onset bowel cancer, provide better support to young people diagnosed with the disease, as well as give younger people a voice in helping change clinical practice and policy. 

Leadership in early-onset bowel cancer

Since 2014, Bowel Cancer Australia has been forging a new paradigm for the growing number of young Australians impacted by bowel cancer. 

Call on Canberra

Each year advocates from across the country descend on Australian Parliament House to advocate for change.

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Never2Young CPD Series

Our Never2Young CPD series aims to overcome perceived age bias by people under age 50 diagnosed with bowel cancer.

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Early-onset guidelines

People diagnosed with early-onset bowel cancer were managed according to clinical practice guidelines that were not age specific – until now!

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Centre of Research Excellence (CRE)

Bowel Cancer Australia is pleased to offer a $3 million grant over five years for an Early-Onset Bowel Cancer Centre of Research Excellence.

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Early-onset research

Rho-associated kinase, is an enzyme that goes into overdrive in people with bowel cancer, accelerating growth and spread of the disease.

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Global Think Tank

Bowel Cancer Australia joined 71 experts and advocates from 18 countries at the first-ever Global Think Tank on Early-Onset Colorectal Cancer (EOCRC).

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Research Symposium

An Early-Onset  Research Symposium convened to help shape development of a Research Roadmap through shared knowledge and collaborative scientific efforts.

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BowelScreen Australia

Providing access to bowel cancer screening for young Australians ineligible for the government screening program.

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Early-onset bowel cancer:
An overview

  • Since the early 2000s, rates of early-onset bowel cancer, diagnosed before age 50, have been increasing in Australia and globally, presenting unique diagnostic, treatment, and prevention challenges.
  • According to a global analysis, Australia has the highest rate of early-onset bowel cancer among 50 countries.
  • 1-in-8 Australians diagnosed with bowel cancer are under age 50 (~12.6%).
  • The risk of being diagnosed with bowel cancer before the age of 40 has more than doubled since the year 2000.
  • Bowel cancer is the deadliest cancer for Australians aged 25-54.
  • Bowel cancer rates are 2 to 3-times higher among Australians born in the 1990s than those born in the 1950s.
  • Most early-onset bowel cancers are sporadic (~75-84%), with hereditary syndromes (primarily Lynch Syndrome) accounting for 16-25%.
  • Australia is experiencing an age-related divergence with increasing bowel cancer incidence among younger people occurring alongside decreasing incidence among people aged 50-74 years.

Six people in red shirts pose with large red letters forming "#N2Y" indoors.

Cause

The drivers of the rising rates of early-onset bowel cancer remain elusive and there does not appear to be a single factor that explains the magnitude or pace of the increase to date. Research suggests a convergence of lifestyle exposures, birth cohort effect in people born after 1950 and interrelated factors such as diet, bacteria in the gut, and inflammation.

Infographic showing factors influencing bowel cancer risk from infancy to adulthood, highlighting genetics, lifestyle, and gut microbiome.

Epidemiology

  • International research shows the decade trend increase for early-onset bowel cancer in Australia, Canada, England, and the United States was 3.7% per annum among adults aged 20-49, and 7% per annum among young adults aged 20-39.
  • If this trend continues, the researchers forecast a doubling of early-onset bowel cancer rates every 20 years in both sexes.
  • In Australia, over the past three decades there has been a 266% increase in bowel cancer incidence rates in adolescents and young adults (15-24 years).

Clinical features

  • Early-onset bowel cancer (diagnosed before age 50) differs from late-onset bowel cancer (diagnosed aged 50 and over), more frequently occurring in the rectum, and has a higher likelihood of advanced stage (III or IV) at diagnosis.
  • International analysis of 23.9 million patients under age 50, across 81 studies, found the most common presenting signs and symptoms of early-onset bowel cancer were blood in the stool, abdominal pain, altered bowel habits, and unexplained weight loss.
  • Blood in the stool and abdominal pain were associated with a 5 to 54-fold and 1.3 to 6-fold increased likelihood of early-onset bowel cancer, respectively.

Pathological characteristics

  • People diagnosed with early-onset bowel cancer are more likely to have aggressive disease features compared to people diagnosed with late-onset bowel cancer, including higher rates of poorly differentiated (highly abnormal cancer cells that have lost the structural features of healthy tissues, making them grow faster and spread more aggressively) and mucinous (tumours that produce large pools of extracellular mucin and have a higher propensity to spread to the lining of the abdomen) and signet-ring (as the cell fills with intracellular mucin, it pushes the nucleus to the outer edge) morphology.
  • A recent Australian study of 2,976 patients who had their tumours tested for BRAF found a major over-representation of BRAFV600E in patients under age 40 with metastatic early-onset bowel cancer who also had more left-sided and fewer deficient mismatch repair (dMMR) tumours (a genetic condition where cells fail to correct mistakes made when DNA is copied).

Molecular and genetic features

  • Around 16-25% of early-onset bowel cancer patients harbor germline mutations, with Lynch syndrome being most common.
  • Mutations in mismatch repair (MMR) genes (Lynch syndrome), the APC gene (Familial adenomatous polyposis), and MUTYH gene (MUTYH-associated polyposis), are associated with an increased risk of early-onset bowel cancer.
  • Microsatellite instability-high (MSI-H) tumours are more prevalent in younger people, highlighting the importance of MSI testing for Lynch syndrome detection and germline gene panels at diagnosis.
Infographic comparing bowel cancer cases: early onset (75-84% sporadic) and all ages (85-90% sporadic) with mutation details.

Risk factors

Recent research has found, apart from Body Mass Index (BMI), trends in behavioural risk such as alcohol use, obesity, physical inactivity, red and processed meat consumption, and low fibre intake, are unlikely to be substantial contributors to the increase of early-onset bowel cancer at a population level, with incidence rates increasing despite favourable trends in several known risk factors.

Other studies however have shown modifiable and exposure risk factors associated with an increased risk of early-onset bowel cancer:

  • A Western-style diet has been associated with an increased risk of early-onset bowel cancer.
  • According to the Nurses’ Health Study II, consuming ≥2 servings/day of sugar-sweetened beverages doubled the risk of early-onset bowel cancer compared to consuming ≤ 1 serving/week, and each additional daily serving during adolescence (ages 13-18) was associated with a 32% increased risk.
  • Childhood and adult obesity have been linked to increased early-onset bowel cancer incidence. The Nurses’ Health Study II found women with obesity (BMI ≥30kg/m2) had nearly double the risk of developing early-onset bowel cancer compared with women with a normal body mass index (BMI <25kg/m2).
  • An analysis of the Nurses’ Health Study II showed women who were sedentary >14 hours/week had a 68% higher risk of early-onset bowel cancer compared to those who were sedentary ≤7 hours/week.
  • People with type 2 diabetes mellitus diagnosed before the age of 50 has been associated with a 3.5-fold increased risk of early-onset bowel cancer.
  • Research suggests a Western-style diet, antibiotic use and other exposures may alter the gut microbiome which can lead to gut dysbiosis (an imbalance in the types and functions of microorganisms that make up the body’s microbiome) and chronic intestinal inflammation, which can promote the transformation of normal, healthy cells into cancerous cells that form into tumours.
  • Other contributors to gut dysbiosis include Fusobacterium nucleatum, a bacterium that usually lives in the mouth, which can migrate to the bowel and cause long-lasting inflammation that can damage DNA, and help cancer cells hide from the body’s immune system.
  • Childhood exposure to a toxin produced by E. coli bacteria in the gut, called colibactin, can cause DNA changes, before cancer develops. The findings of a large-scale study conducted by Mutographs suggest that more people could be developing early-onset bowel cancer because more people are being exposed to colibactin as children, with colibactin mutational signatures being 3.3 times more common in people diagnosed before age 40 than after age 70.
  • Research continues to investigate the relationship between early-onset bowel cancer and environmental exposures in early life, even as early as before birth; fathers’ occupation and exposure to hazardous materials during mothers’ pregnancy; microplastics; disruptions in circadian rhythms and the impact on accelerated colon aging, for example.
Infographic explaining colibactin, DNA damage, and its link to colorectal cancer in children under 40 years.

Prognosis

  • Early-onset bowel cancer cases are often more aggressive and diagnosed at advanced stages, leading to a worse prognosis. Due to low clinical suspicion in young adults, diagnosis is often delayed.
  • Younger patients however may receive more aggressive treatment, which can potentially improve disease-specific survival outcomes.
  • Research shows mixed results regarding overall and progression-free survival between people diagnosed with early-onset bowel cancer than those diagnosed with late-onset bowel cancer, with similar or better outcomes observed when adjusted for tumour biology, including molecular markers (MSI, BRAF and KRAS status) and stage at diagnosis.

Current screening strategies

  • Australia is experiencing an age-related divergence with increasing bowel cancer incidence among younger people occurring alongside decreasing incidence among people aged 50-74 years.
  • Family history and high-risk genetic syndromes remain critical for risk stratification for early-onset bowel cancer, requiring earlier and more frequent surveillance.
  • From 1 July 2024, the National Bowel Cancer Screening Program start age was lowered from 50 to 45. Eligible people aged 45-49 can now opt-in to receive a free immunochemical faecal occult blood test kit.
  • In 2023, medical guidelines were updated so health care professionals can consider offering an immunochemical faecal occult blood test every 2 years to people aged 40-44 at average risk of bowel cancer, who request screening following a discussion about the benefits and potential harms.
  • While Bowel Cancer Australia recognises lowering the screening age is one step forward for people aged 40 and over, it does not address the rising rates of early-onset bowel cancer.

Bowel cancer is the deadliest cancer for Australians aged 25-54.

Five individuals in a monochrome portrait, arranged in a group with serious expressions against a dark background.
1884
people under age of 50 are diagnosed with bowel cancer each year (12.6% of all bowel cancer cases).
342
people under age 50 die from bowel cancer each year (5.8% of all bowel cancer deaths).
51.7 %
of early-onset bowel cancer cases are diagnosed in women.
48.3 %
of early-onset bowel cancer cases are diagnosed in men.
85 %
of people diagnosed with early-onset bowel cancer experience symptoms.

 

#N2Y Advocacy Agenda

Bowel Cancer Australia’s Never2Young Advocacy Agenda seeks to improve care experiences and health outcomes for younger people by championing –

  • Greater awareness: among the community and health professionals of early-onset bowel cancer.
  • Lower screening age: in response to the increasing rates of bowel cancer in younger people.
  • Prompt GP referral: to a colonoscopy for all younger people who present with symptoms that may be consistent with bowel cancer.
  • Improved pathways: that ensure timely triage, diagnosis and treatment for younger people.
  • Better understanding: the challenges of early-onset bowel cancer to improve and tailor treatment, support and care for younger people.
  • Further research: into the causes of early-onset bowel cancer and building a path toward a cure.

Lived Experiences

Help us to challenge perceptions and create a powerful voice for change by sharing our Never2Young Advocacy Agenda and your lived experience.

Share your Experience
A large group of people in red shirts with "N2Y NEVER too YOUNG" gathered outdoors, smiling and waving.

Action on early-onset bowel cancer

It is a common misconception that bowel cancer is ‘an old person’s disease’, but the reality is that you should never be told that you are too young to have bowel cancer.

Do not accept “you’re too young to have bowel cancer” as an explanation for your symptoms

Unfortunately, Bowel Cancer Australia regularly receives feedback from younger people diagnosed with early-onset bowel cancer who have initially had their signs and symptoms attributed to haemorrhoids, food intolerances, a normal part of recovery after having a baby, or even just a result of living a hectic lifestyle.

Although many of the symptoms of bowel cancer are common to multiple health concerns, please do not accept “you’re too young to have bowel cancer” as an explanation for your symptoms, ask your GP to be referred for further investigations.

International analysis of nearly 25 million patients younger than 50, across 81 studies, found the most common presenting signs and symptoms of early-onset bowel cancer were blood in the stool, abdominal pain, altered bowel habits, and unexplained weight loss.

Blood in the stool and abdominal pain were associated with a 5 to 54-fold and 1.3 to 6-fold increased likelihood of early-onset bowel cancer, respectively.

The analysis further supports Australian research which found younger people may spend between three months and five years seeing multiple doctors before diagnosis; make ten or more visits to GPs; with time to diagnosis up to 60% longer for younger people who are more likely to be diagnosed in later stages of the disease.

Younger people perceive their GPs’ low suspicion of cancer given their age as an age bias that shapes the nature of clinical assessments, influences the investigations conducted, and referrals given, and creates tensions which obstruct shared decision-making.

Late-stage diagnosis increases the likelihood of aggressive treatment with physical, psychosocial, and quality of life outcomes that are uniquely challenging for people under-50, especially with regards to fertility, ostomy management, career planning, as well as feelings of isolation due to the common misconception that bowel cancer is an older person’s disease.

It is important for younger people and GPs to have a high suspicion of red flag signs and symptoms and to work together to ensure prompt investigations to rule out early-onset bowel cancer as an underlying cause.

A man with a mustache speaks about the 4 red flag signs and symptoms of bowel cancer. Text includes branding for Bowel Cancer Australia.

Cover of a guide titled "Early-Onset Bowel Cancer: A Guide for Under 50s" with a man holding a water bottle.

Early-onset bowel cancer

Bowel Cancer Australia’s resource explains how bowel cancer can affect your body, emotions, relationships and daily life. 

‘Youthfulness’ should not be a barrier to diagnosis 

Australian research has revealed younger people with bowel cancer symptoms find themselves self-advocating as the only consistent and reliable resource for overcoming age bias, barriers to diagnosis, and optimising outcomes.

The research was the first to investigate the perspectives of early-onset bowel cancer patients’ regarding ways to improve experiences of care in Australia, New Zealand, and the United Kingdom.

Chief Investigator, Dr Klay Lamprell, Australian Institute of Health Innovation, Macquarie University, said ‘Young people with bowel cancer say the same the world over. Because they are young, they are overlooked for bowel cancer.’

‘The research found younger people may spend between three months and five years seeing multiple doctors before diagnosis. They may make ten or more visits to GPs.’

‘Even when younger people experience blood in their poo or rectal bleeding, GPs may not immediately refer them to specialists for further testing,’ Dr Lamprell added.

Early-onset bowel cancer patients differ from later-onset bowel cancer patients in their diagnostic trajectories; time to diagnosis can be 60% longer with a greater number of missed diagnostic opportunities, and younger people are more likely to be diagnosed in later stages of the disease.

Medical professionals in scrubs observe a monitor displaying an endoscopic image during a colonoscopy.

 

Late-stage diagnosis increases the likelihood of aggressive treatment with physical, psychosocial, and quality of life outcomes that are uniquely challenging for this under-50 patient population, especially with regards to fertility and ostomy management.

‘Patients perceive their GPs’ low suspicion of cancer given their age as an age bias that shapes the nature of clinical assessments, influences the investigations conducted and referrals given, and creates tensions which obstruct shared decision-making,’ Dr Lamprell said.

Eventual referrals and lengthy wait times for non-urgent colonoscopies were also a common theme of delayed diagnosis and a cause of patient dissatisfaction with GPs.

‘Young people seeking diagnosis are also challenged by limited clinical awareness of early-onset bowel cancer.’

‘Our research concludes that with the rising global incidence of bowel cancer in people aged under 50, there is a mounting imperative for GPs to receive more information and clinical guidance on early-onset bowel cancer diagnosis,’ Dr Lamprell concluded.

Two scientists in lab coats smile while working in a laboratory filled with equipment and colorful containers.

Why is bowel cancer in young Australians rising?

Associate Professor Daniel Buchanan, University of Melbourne