Skip to content
How It Works
Explore
Resources Ask a Question
Who It's For
Patients
Decode results, prep for appointments, weigh options.
Caregivers & advocates
Carry the research load for someone you love.
Providers & clinicians
Resources for patients in your practice.
Log In Ask a Question
PubMed This is a summary of 16 peer-reviewed journal articles Updated
Gastroenterology

Understanding Your Diagnosis

At a Glance

Juvenile Polyposis Syndrome (JPS) is a rare genetic condition causing multiple non-cancerous polyps to grow in the digestive tract. Unlike single harmless polyps, JPS carries an increased cancer risk. It is managed effectively through regular endoscopies and colonoscopies to safely remove polyps.

When you or your child is diagnosed with a rare genetic condition, it is entirely normal to feel a sense of shock. You are suddenly faced with navigating an unfamiliar medical landscape. The most important thing to remember is that you have time to learn, and proactive management is highly effective.

Understanding JPS

Juvenile Polyposis Syndrome (JPS) is a rare genetic condition that causes the growth of many non-cancerous growths called polyps throughout the digestive tract [1][2]. It is estimated to affect approximately 1 in 100,000 to 1 in 160,000 people [3][4].

The term “juvenile” refers to the type of polyp under a microscope, not the age of the patient. While many people are diagnosed in childhood or their teens, these polyps can appear at any age [5].

JPS vs. Solitary Polyps: Why the Distinction Matters

It is very common for children to develop a single juvenile polyp (an “isolated” or “solitary” polyp). These are typically harmless, do not increase cancer risk, and usually do not require long-term follow-up once removed [5][6].

In contrast, JPS is a syndrome. This means it involves multiple polyps and carries a lifelong risk of those polyps becoming cancerous over time if they are not monitored and removed [5][7]. Doctors generally diagnose JPS if a person has:

  • More than 5 juvenile polyps in the colon or rectum [8][9].
  • Multiple juvenile polyps throughout the digestive tract (stomach and intestines) [8].
  • Any number of juvenile polyps alongside a family history of JPS [9].

What is a Hamartomatous Polyp?

The polyps found in JPS are specifically called hamartomatous polyps.

  • A hamartoma is a benign (non-cancerous) growth made of the same type of tissue normally found in that part of the body, but the tissue is growing in a disorganized way [1].
  • Think of it like a “disorganized cluster” of normal, healthy cells. While they start out benign, if they are left alone for many years, they have the potential to undergo changes that lead to cancer. This is why regular removal is the foundation of JPS care [7][10].

Genetics and Inheritance

JPS is an autosomal dominant hereditary disorder [3]. This means:

  1. A person only needs one copy of the changed gene (from one parent) to have the condition.
  2. A parent with JPS has a 50% chance of passing the gene to each of their children.
  3. In some cases, JPS occurs “de novo,” meaning it is a new genetic change in the child and was not inherited from either parent [11].

Researchers have identified two main genes associated with JPS: SMAD4 and BMPR1A [12][13]. Identifying which gene is involved allows your doctor to tailor your care specifically to your body’s needs. For example, people with the SMAD4 mutation have a broader risk profile that requires screening beyond just the digestive tract [14][15].

The Path Forward

A diagnosis of JPS changes your medical routine, but it does not dictate your future. The cornerstone of management is surveillance—regularly scheduled endoscopies and colonoscopies to find and remove polyps before they can cause problems [10][16]. By being proactive and staying consistent with these check-ups, the risk of cancer can be significantly reduced [6][10]. Your medical team is there to partner with you in this lifelong journey of health.

Common questions in this guide

What is the difference between a single juvenile polyp and Juvenile Polyposis Syndrome?
A single juvenile polyp is usually harmless, does not increase cancer risk, and typically does not require long-term follow-up once removed. JPS, however, is a genetic syndrome involving multiple polyps that requires lifelong monitoring due to an increased risk of cancer.
Does "juvenile" mean only children get these polyps?
No. The term "juvenile" refers to the specific way the polyp tissue looks under a microscope, not the age of the patient. While often diagnosed in childhood or the teenage years, these polyps can appear at any age.
How is Juvenile Polyposis Syndrome diagnosed?
Doctors typically diagnose JPS if a person has more than five juvenile polyps in the colon or rectum, multiple juvenile polyps throughout the digestive tract, or any number of juvenile polyps combined with a family history of the condition.
What genes cause Juvenile Polyposis Syndrome?
The two main genetic mutations linked to JPS are found in the SMAD4 and BMPR1A genes. Identifying the specific gene involved helps your medical team create a personalized screening plan, as different genetic mutations carry different health risks.
How is Juvenile Polyposis Syndrome treated and managed?
The most important part of JPS management is proactive surveillance. This involves regular endoscopies and colonoscopies to find and remove polyps before they can undergo changes that lead to cancer.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Based on the number and location of the polyps, does my child (or do I) meet the official clinical criteria for JPS?
  2. 2.Have we identified a specific genetic mutation, such as SMAD4 or BMPR1A, and how does that change our surveillance plan?
  3. 3.What is the recommended schedule for our next endoscopy and colonoscopy?
  4. 4.Are there any specialists, like a genetic counselor or a pediatric gastroenterologist with JPS experience, we should add to our care team?

Questions For You

Tap a prompt to share your answer — we'll use it plus this page's context to start a tailored conversation.

References

References (16)
  1. 1

    The c.386A>C p.(Asn129Thr) variant in SMAD4 is likely to be pathogenic, causing Juvenile Polyposis Syndrome. A case report of a mosaic variant.

    Valentín F, de Tejada AH, Gonzaléz-Vioque E, et al.

    Molecular genetics & genomic medicine 2024; (12(1)):e2348 doi:10.1002/mgg3.2348.

    PMID: 38146137
  2. 2

    Pathology of Gastrointestinal Polyposis Disorders.

    Rosty C, Brosens LAA

    Gastroenterology clinics of North America 2024; (53(1)):179-200 doi:10.1016/j.gtc.2023.09.006.

    PMID: 38280747
  3. 3

    Prevalence and Incidence of Peutz-Jeghers Syndrome and Juvenile Polyposis Syndrome in Japan: A Nationwide Epidemiological Survey in 2022.

    Matsubara Y, Nakamura Y, Nakayama Y, et al.

    Journal of gastroenterology and hepatology 2025; (40(2)):473-481 doi:10.1111/jgh.16839.

    PMID: 39623880
  4. 4

    A Rare Case of Juvenile Polyposis Syndrome in a 13-year-old Girl from a Rural Area.

    Lakhani M, Mohsin Z, Pirzada S, Zulfikar I

    Cureus 2019; (11(4)):e4567 doi:10.7759/cureus.4567.

    PMID: 31281750
  5. 5

    A juvenile polyp on colonoscopy, is it premalignant?

    Kumar K, Patel H, Tariq H, et al.

    Clinical case reports 2019; (7(12)):2605-2606 doi:10.1002/ccr3.2561.

    PMID: 31893117
  6. 6

    Cancer risk and mortality in patients with solitary juvenile polyps-A nationwide cohort study with matched controls.

    Jelsig AM, Wullum L, Kuhlmann TP, et al.

    United European gastroenterology journal 2023; (11(8)):745-749 doi:10.1002/ueg2.12441.

    PMID: 37498302
  7. 7

    Juvenile polyposis syndrome: A case report.

    Pérez-Castilla A, Peñailillo P, Oksenberg D

    International journal of surgery case reports 2019; (59()):73-75 doi:10.1016/j.ijscr.2019.04.041.

    PMID: 31108454
  8. 8

    Juvenile Polyps in Denmark From 1995 to 2014.

    Jelsig AM, Ousager LB, Brusgaard K, Qvist N

    Diseases of the colon and rectum 2016; (59(8)):751-7 doi:10.1097/DCR.0000000000000634.

    PMID: 27384093
  9. 9

    Overlap syndrome of hereditary hemorrhagic telangiectasia and juvenile polyposis syndrome: ten years follow-up-case series and review of literature.

    Gonzalez ML, Vazquez C, Argüero MJ, et al.

    Familial cancer 2024; (24(1)):1 doi:10.1007/s10689-024-00425-9.

    PMID: 39546055
  10. 10

    Juvenile polyposis syndrome: An overview.

    Dal Buono A, Gaiani F, Poliani L, Laghi L

    Best practice & research. Clinical gastroenterology 2022; (58-59()):101799 doi:10.1016/j.bpg.2022.101799.

    PMID: 35988962
  11. 11

    Diagnosis and management of cancer risk in the gastrointestinal hamartomatous polyposis syndromes: recommendations from the U.S. Multi-Society Task Force on Colorectal Cancer.

    Boland CR, Idos GE, Durno C, et al.

    Gastrointestinal endoscopy 2022; (95(6)):1025-1047 doi:10.1016/j.gie.2022.02.044.

    PMID: 35487765
  12. 12

    Giant Gastric Folds in Juvenile Polyposis.

    Leonard NB, Bronner MP

    Case reports in gastroenterology 2021; (15(3)):985-993 doi:10.1159/000521125.

    PMID: 35110986
  13. 13

    Whole genome sequencing and disease pattern in patients with juvenile polyposis syndrome: a nationwide study.

    Jelsig AM, van Overeem Hansen T, Gede LB, et al.

    Familial cancer 2023; (22(4)):429-436 doi:10.1007/s10689-023-00338-z.

    PMID: 37354305
  14. 14

    JP-HHT phenotype in Danish patients with SMAD4 mutations.

    Jelsig AM, Tørring PM, Kjeldsen AD, et al.

    Clinical genetics 2016; (90(1)):55-62 doi:10.1111/cge.12693.

    PMID: 26572829
  15. 15

    Case report of juvenile polyposis/hereditary hemorrhagic telangiectasia syndrome: first report in Korea with a novel mutation in the SMAD4 gene.

    Kang B, Hwang SK, Choi S, et al.

    Translational pediatrics 2021; (10(5)):1369-1376 doi:10.21037/tp-21-12.

    PMID: 34189096
  16. 16

    Clinical Spectrum and Science Behind the Hamartomatous Polyposis Syndromes.

    Yehia L, Heald B, Eng C

    Gastroenterology 2023; (164(5)):800-811 doi:10.1053/j.gastro.2023.01.026.

    PMID: 36717037

This page provides educational information about Juvenile Polyposis Syndrome (JPS). It is not a substitute for professional medical advice, diagnosis, or a personalized surveillance plan from your gastroenterologist or genetic counselor.

Get notified when new evidence is published on Juvenile polyposis syndrome.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.