Leiomyosarcoma (LMS): Causes, Symptoms, and Treatment

What Is Leiomyosarcoma?

Leiomyosarcoma (LMS) is a rare cancer that begins in smooth muscle tissue. These muscles are present in your digestive system, blood vessels, uterus, and urinary system.

This cancer usually shows up in the uterus, belly, or legs. It grows fast, like doubling in size in just a month. These cancer cells can travel through your bloodstream to other soft tissues.

Many people don't notice symptoms until they're advanced. That's when it becomes life-threatening. If doctors catch it early, you can recover.

How Common Is It?

Approximately 15,000 people in the United States are diagnosed with a soft tissue sarcoma each year. It constitutes 10% to 20% of such cases. One in 100,000 U.S. patients has LMS cancer.

LMS is more frequently seen in adults, and children are less affected by it. Only 20 to 30 children in the U.S. are suspected of having LMS. They are rare, with an estimated incidence of LMS of the uterus at around 6 per 1 million cases per year in the US.

What Are the Different Types of Leiomyosarcoma?

Three subtypes of leiomyosarcoma are the following:

1. Somatic Soft Tissue LMS: This one attacks your body’s connective tissue. It is the most common type of LMS you will have. One example of somatic soft-tissue LMS is uterine leiomyosarcoma.

2. Cutaneous or Subcutaneous LMS: It has to do with the piloerector muscles in your skin and eyes. You develop goosebumps as the little muscles that maintain hair follicles (piloerector muscles) contract, and you get pupils that constrict and expand.

3. LMS of a Vascular Origin: This develops inside a large blood vessel such as your pulmonary arteries, inferior vena cava, or peripheral arteries. It’s the rarest form of LMS.

What Are the Symptoms of Leiomyosarcoma?

Leiomiosarcoma symptoms depend heavily on its size and location. Early signs may not be present, but as the tumor develops, some people report certain indications.

1. General symptoms:

• Fever.

• Nausea and vomiting.

• Tiredness.

• Weight loss.

• A firm and painless lump under the skin.

• Bloating.

2. Depending on where it occurs in your digestive system, leiomyosarcoma may result in the following:

• Stomach pain.

• Loss of appetite.

• Dark stools (from blood in the stool).

3. If you have uterine leiomyosarcoma, you may experience

• Abnormal uterine bleeding.

• Frequent urination.

• Vaginal discharge.

What Are the Causes of Leiomyosarcoma?

The precise cause of leiomyosarcoma is unknown. This typically occurs when smooth muscle cells mutate their DNA (deoxyribonucleic acid). These changes drive the cancer cells to divide and grow rapidly. Cancer cells survive, but the healthy cells die.

These cancer cells may then grow or spread to form a tumor. The tumor can grow and invade, destroying healthy tissue. Over time, cancer cells can become dislodged and migrate to other parts of the body, causing metastatic cancer.

What Are the Risk Factors of Leiomyosarcoma?

Risk factors for leiomyosarcoma include:

• It can occur at any age. However, it occurs most frequently in adults and is rare in children.

• If you previously received radiation therapy, you are at high risk.

• If you are exposed to some toxic chemicals (although this is infrequent).

• Human herpes 8 (a viral infection) raises your risk of leiomyosarcoma.

• Prolonged use of medicines, like Tamoxifen (used to treat breast cancer), raises your risk.

• Having certain genetic conditions increases an individual's risk of leiomyosarcoma. Hereditary retinoblastoma (eye cancer), Li-Fraumeni syndrome (a genetic disorder that raises the risk of cancer), Gardner syndrome (an inherited disorder), Gorlin syndrome (a genetic disorder that occur due to gene mutations), neurofibromatosis type 1 (NF1, a tumor that grows in the nerves), tuberous sclerosis (a disorder that causes noncancerous tumors to grow), and Werner syndrome (appearance of premature aging) are among these conditions.

• Does LMS run in families? No, if you have LMS without any other genetic condition, then it doesn’t run in families.

How Is Leiomyosarcoma Diagnosed?

Leiomyosarcoma can be diagnosed in the following ways:

1. Physical Examination: Your doctor will do a physical evaluation and ask about your symptoms. They will also ask about your medical history, including any ongoing or previous ailments.

2. Imaging Tests: Your doctor will do imaging tests to look inside your body and find out the size and location of the tumor.

If you have symptoms of LMS, your doctor will use imaging scans (e.g., MRI (magnetic resonance imaging), CT (computed tomography), angiography, and/or PET (positron emission tomography)) to see where the tumor is and how large it is. They will look for evidence that the tumor has spread to other parts of the body.

3. Biopsy: A biopsy is necessary to have the tumor tested for LMS; this involves your doctor extracting a small sample of tissue from the tumor using a needle. LMS can be misdiagnosed as another tumor or disorder by imaging scans on occasion. LMS is confirmed by tumor biopsy.

How Is Leiomyosarcoma Treated?

The treatment options for leiomyosarcoma are as follows:

• Surgery: Through surgery, your doctor may take out the entire tumor so the cancer won't grow back.

• Radiation Therapy: Sometimes doctors use radiation before surgery (neoadjuvant surgery) to shrink the tumor. Other times, they'll use it after surgery (adjuvant therapy) to kill cancer cells that might be hiding. Your doctor will decide what works best for you.

• Chemotherapy: When the tumor is large or has spread to other parts of your body, that's when chemotherapy is used. These medicines attack cancer cells.

• New Treatments (Targeted Therapy and Immunotherapy): Your doctor might suggest targeted therapy alone or in combination with other treatments.

What Is the Survival Rate of Leiomyosarcoma?

The leiomyosarcoma survival rate depends on:

• The stage of the cancer.

• Where the tumor started.

• If the tumor can be fully removed.

• The person’s overall health.

Cancer Stage	5-Year Survival Rate
Localized (cancer has not spread to other body parts)	63%
Regional (cancer spread to the tissues and nearby lymph nodes)	36%
Distant (cancer spread to other body parts)	14%

When to See a Doctor?

See your doctor immediately if your symptoms worsen after your treatment starts. Go to your doctor if you have

• A new or growing lump under your skin.

• Severe pain.

• Extreme weight loss.

• Severe abdominal pain.

• Difficulty urinating.

Conclusion:

Leiomyosarcoma is a rare type of cancer that starts in smooth muscle tissue. You'll find these muscles in places like your uterus, belly, blood vessels, and other spots throughout your body.

It's aggressive, and honestly, doctors still don't know exactly what causes it. Catching it early makes all the difference. The outcome depends on how soon it's found, how big the tumor is, and where it's located in your body.

When LMS is localized and hasn't spread, there's a good chance for a cure. But if it's already advanced or has spread to other parts of the body? That's when things get tough. Standard treatments often don't work well against it. That's why getting diagnosed quickly and finding the right specialist is so important.

If you're experiencing unusual lumps, persistent pain, or any symptoms that worry you, don't wait. Worried about symptoms you're experiencing? Our doctors are here to help. Consult a cancer specialist who can properly evaluate what's going on.

Key Takeaways:

• Leiomyosarcoma is a rare type of cancer that starts in your smooth muscles, like in your organs and soft tissues. It's aggressive and needs a whole team of specialists to tackle it properly.

• This cancer spreads and has the potential to recur. That's why catching it early and getting to a specialist cancer center fast makes all the difference. Research shows that once it spreads, regular treatments don't work.

• Surgery is still our best shot at beating this, but this cancer is aggressive and often fights back against drugs. For women with the uterine type (the most common one), survival rates can drop to just 15% if it's already spread when found. That's why getting checked out quickly is so important.