Introduction

Liposarcoma is a rare cancer that begins in fat cells, usually found deep inside the arms, legs or abdomen. It is a type of soft tissue sarcoma that can grow quietly, often only attracting attention when it causes a painless lump, swelling or discomfort. 

 Sometimes cancer appears to run in families. While most cases happen by chance, some people inherit gene changes that raise their risk. Liposarcoma can be triggered by such inherited mutations, which lead fat cells to grow abnormally and form tumours.¹ In some families, inherited mutations lead to what doctors call familial cancer syndromes, which can raise the risk of cancers-including liposarcoma. 

This article explores the link between inherited cancer syndromes and liposarcoma, explaining who is most at risk, how these syndromes are passed on, and what it means for you and your family.

What are familial cancer syndromes?

Familial cancer syndromes are inherited changes in genes that raise your cancer risk. These changes often run through families, affecting multiple relatives. 

Most cancers aren’t caused by inherited genes, and having a family history doesn’t always mean your own risk is high. Inherited mutations are thought to account for only about five to ten per cent of all cancers. However, people with familial cancer syndromes are more likely to develop multiple cancers and often at a younger age. Some of these syndromes, like Li-Fraumeni syndrome and hereditary retinoblastoma, are specifically linked to soft tissue cancers such as liposarcoma.²

Importance of the association with liposarcoma

Knowing which familial cancer syndromes are linked to liposarcoma helps identify individuals and families at higher risk. While most liposarcoma cases are sporadic, rare inherited syndromes do significantly raise risk. Identifying these risks allows doctors to offer early genetic testing, more frequent monitoring, and tailored care to detect and treat tumours sooner.

Familial cancer syndromes linked to liposarcoma

Several rare familial cancer syndromes have been associated with an increased risk of developing soft tissue sarcomas, like liposarcoma. Learning more about these conditions can help families understand their causes, features and risks, enabling them to get the care they need to maintain their long-term health. 

Li-Fraumeni syndrome

Overview

Li Fraumeni syndrome (LFS) is a rare inherited syndrome that greatly increases the risk of several cancers in both children and adults. Around ninety per cent of people assigned female (AFAB) and seventy per cent of people assigned male (AMAB) with LFS will develop cancer at some point in their lives.³ While most cases are inherited, some are due to a new mutation without family history.

LFS is caused by changes in the TP53 gene, which normally helps repair damaged DNA or causes damaged cells to die.² Mutations in TP53 disrupt this protective process, allowing damaged cells to grow into cancer.² These gene changes are usually inherited in an autosomal dominant pattern, meaning a child has a fifty per cent chance of inheriting the mutation if one parent has it.²

Key features

LFS increases the risk of many cancers. The most common include:

•  Breast cancer, often in young AFAB adults 
• Soft tissue sarcomas, including liposarcoma
• Bone cancers, such as osteosarcoma 
• Brain tumours, and adrenocortical carcinoma in children and young adults³

Less common cancers associated with LFS include leukaemia, colon cancer, gastrointestinal cancers and lymphomas.

Risk of liposarcoma

Soft tissue sarcomas-like liposarcoma occur in around fifteen per cent of AFAB and twenty-two percent of AMAB individuals with LFS.³ So, if liposarcoma appears in someone young or in several family members, LFS should be considered. Hereditary retinoblastoma 

Overview

Hereditary retinoblastoma is a rare eye cancer, typically in children under five. About forty per cent of cases are genetic and often occur before birth, affecting one or both eyes.⁴ 

Causes

This condition is caused by changes in the RB1 tumour suppressor gene, which normally controls cell growth in the eye. Children who inherit one faulty copy of the gene have an eighty to ninety per cent chance of developing eye tumours—and these gene changes are passed down in an autosomal dominant pattern.⁴

Key features

Children often appear healthy at birth, but may be diagnosed early thanks to routine eye screenings, or by noticing an unusual white glow in the pupil-sometimes accompanied by a squint, eye redness, or involuntary eye movements called nystagmus.

Children diagnosed with the condition are significantly more likely to develop secondary cancers, especially osteosarcoma and soft tissue sarcomas like leiomyosarcoma, brain tumours and melanoma.^2,4

Risk of liposarcoma 

Survivors of hereditary retinoblastoma are at increased risk of later cancers. Nearly half of these secondary cancers are soft tissue sarcomas, including liposarcoma.² These typically occur much later in life and may arise in parts of the body not exposed to radiation.²

Neurofibromatosis type 1

Overview

Neurofibromatosis type 1 (NF1) is an inherited condition that affects around one in three thousand people, causing nerve-related growths in the skin, brain, spine and other organs.²

Causes
NF1 is caused by changes in the NF1 gene, which produces neurofibromin, a protein that helps regulate cell growthAbout half of NF1 cases are inherited, while other half appear due to new mutations.^2,4

Key features

• People with NF1 often have: Light brown skin patches known as café-au-lait spots 
• Freckling in hidden areas (underarms, groin) 
• Non-cancerous nerve tumours (neurofibromas) that may cause pain or movement issues, bone issues like scoliosis and learning challenges 

Risk of liposarcoma

Although NF1 is linked to higher risks of other sarcoma-like nerve sheath tumour and gastrointestinal stromal tumours, its link to liposarcoma is weather and still under study.²

Other hereditary syndromes with a possible association 

Other inherited conditions raise the overall risk of soft tissue sarcomas, though evidence linking them specifically to liposarcoma is limited. These include familial adenomatous polyposis (known for desmoid tumours) and Werner syndrome (characterised by premature ageing and increased risk of bone and soft tissue sarcomas).⁶

Genetic and clinical implications

When are familial cancer syndromes suspected?

Doctors look for familial cancer syndromes when: 

• You have liposarcoma at a young age
• Multiple relatives have had cancer
• You have more than one primary tumour. In such cases, genetic testing and counselling can confirm if an inherited syndrome is present²

Genetic testing and counselling

If a family history or early diagnosis suggests a genetic risk, doctors may offer genetic testing. This is done using a blood sample, which is analysed for known gene changes. Genetic counsellors help you understand the results, what they mean for you and your family, and any next steps to consider. 

What this means for your care 

Knowing about an inherited cancer risk can help you get personalised care, such as:

• More frequent check-ups or imaging
• Lifestyle advice to reduce cancer risk
• Preventive measures—including medication or surgery—to reduce the chance of cancer
  Although this can feel overwhelming, genetic counsellors provide support and help your family make informed decisions

FAQs

Can liposarcoma run in families?

Most cases of liposarcoma happen by chance and are not inherited. However, in rare situations, liposarcoma may be linked to a genetic condition that runs in the family—called a familial cancer syndrome. People with conditions like Li‑Fraumeni syndrome or hereditary retinoblastoma may have a higher chance of developing liposarcoma, especially at a young age. If several relatives have had soft tissue cancers, or if you're diagnosed early in life, it may be worth exploring genetic testing.

What are the warning signs of inherited cancer syndromes?

Inherited cancer syndromes often involve:

• A strong family history of cancer (especially in younger relatives)
• Multiple relatives with the same or related cancers
• People diagnosed with more than one type of cancer
• Certain rare cancers, such as sarcomas, occurring in children or young adults

If you recognise these signs in your family, talk to your GP or a genetic counsellor. They may suggest a referral for genetic testing to better understand your risk.

Should I get genetic testing if I have liposarcoma?

Not everyone with liposarcoma needs genetic testing. It’s usually recommended if:

• You were diagnosed at a younger age than usual
• There’s a history of cancer in your close family
• You’ve had more than one type of cancer

A genetic counsellor can help review your family history and decide if testing is right for you. If a gene mutation is found, this could help guide treatment options and offer useful information for your relatives.

Summary

While most liposarcomas are not inherited, certain familial cancer syndromes so raise your risk. Being aware of these links can help with early diagnosis, regular monitoring, and personalised care, all of which can improve your health and quality of life. Genetic specialists can offer reassurance, guidance and support to help you and your family stay proactive.