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While muscle cancer is not a recognized form of cancer, there are cancers that affect the muscles. One such example is Leiomyosarcoma (LMS), a rare and aggressive cancer that grows in the smooth muscles of hollow organs like the intestines, stomach, bladder, and blood vessels. Another form of muscle cancer is rhabdomyosarcoma, previously thought to originate from immature muscle cells but now understood to arise from immature progenitors that would normally develop into cells lining blood vessels. Interestingly, skeletal muscle tissue is highly resistant to metastasis, or the spread of cancer from a primary site, which researchers attribute to sustained oxidative stress in the tissue.
| Characteristics | Values |
|---|---|
| Is muscle cancer a thing? | No, but there is a type of rare cancer called Leiomyosarcoma (LMS) that grows in the smooth muscles. There is also rhabdomyosarcoma, the most prevalent soft tissue cancer in children, which was previously thought to be a muscle cancer. |
| How is LMS diagnosed? | Doctors use imaging scans such as MRI, CT, angiography, and PET to locate and size the tumor. A biopsy is then performed to confirm that the tumor is LMS. |
| LMS treatment | The best option for LMS treatment is surgery, followed by radiation therapy. Chemotherapy is used in combination with surgery when the LMS tumors are large or have spread. |
| LMS prognosis | When LMS is identified early and removed by surgery, the prognosis is good and a full recovery is likely. |
| Why doesn't cancer metastasize to skeletal muscle? | This is due to the sustained oxidative stress in muscle tissue, which places physiological stress on cancer cells. |
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What You'll Learn
- Rhabdomyosarcoma is a soft tissue cancer, not a muscle cancer
- Leiomyosarcoma (LMS) is a rare cancer that grows in smooth muscles
- Cancer rarely metastasizes to skeletal muscle due to sustained oxidative stress
- Imaging scans and biopsies are used to diagnose LMS
- Surgery is the best treatment option for LMS
Rhabdomyosarcoma is a soft tissue cancer, not a muscle cancer
There is no such thing as "muscle cancer". However, Rhabdomyosarcoma, which was previously believed to be a muscle cancer, is actually a soft tissue cancer. It is a rare form of cancer that typically affects children and teenagers but can also develop in adults. It is the most prevalent soft tissue cancer in children.
Rhabdomyosarcoma was previously believed to arise from immature muscle cells because the tumors resembled muscle under the microscope. However, researchers at St. Jude Children's Research Hospital discovered that it actually arises from immature progenitors that would normally develop into cells lining blood vessels. These blood vessels occupy the space between muscle fibers. This discovery has important implications for the diagnosis and treatment of rhabdomyosarcoma, as it provides new insights into the cellular origin of the cancer.
Rhabdomyosarcoma can develop anywhere in the body but usually affects the muscles in the arms, legs, head and neck, and abdomen. It is a type of soft tissue sarcoma, which is a rare cancer that affects the bones and soft tissues. There are three distinct types of rhabdomyosarcoma: embryonal, alveolar, and pleomorphic. The type of treatment depends on the level of risk and the location of the cancer in the body. Treatment options include surgery, chemotherapy, and radiotherapy.
It is important to note that skeletal muscle, the tissue that makes up the biceps and quadriceps, is highly resistant to metastasis. This is because of the sustained oxidative stress in muscle tissue, which places physiological stress on cancer cells and prevents their growth. This discovery has significant implications for cancer treatment and prevention.
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Leiomyosarcoma (LMS) is a rare cancer that grows in smooth muscles
Muscle cancer is indeed a thing, and it exists in the form of Leiomyosarcoma (LMS), a rare and aggressive cancer that starts in the smooth muscle tissue. Smooth muscle is present throughout the body, in all blood vessels, as well as in the intestines and digestive tract. Therefore, LMS can occur anywhere in the body, although it is most commonly found in the uterus.
LMS is a type of soft tissue sarcoma, which begins in the soft or connective tissues of the body, including muscle, fat, and blood vessels. There are dozens of types of soft tissue sarcoma, and LMS is believed to be one of the more common subtypes in adults, with an estimated incidence of 1 in 100,000 people per year. However, compared to lung or colorectal cancer, it is still considered quite rare.
The symptoms of LMS depend on the size and location of the tumor. Some people may not experience any symptoms in the early stages, but as the tumor grows, they may notice certain signs such as a firm, painless lump in the soft tissues. LMS can also cause cramping or pain when it arises in an internal organ. Symptoms rarely involve the bones, except in the late stages of the disease.
The best option for LMS treatment is surgery, and if the tumor is removed completely, there is a good chance of curing LMS. Radiation therapy and chemotherapy are also used, especially when the cancer has spread to other parts of the body. While the prognosis for LMS varies depending on the stage of the disease, early detection and surgical removal typically lead to a good prognosis and a likely full recovery.
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Cancer rarely metastasizes to skeletal muscle due to sustained oxidative stress
While there is such a thing as muscle cancer, it is not what it seems. Previously, scientists believed that rhabdomyosarcoma, the most common soft-tissue cancer in children, arose from immature muscle cells because the tumour resembled muscle under a microscope. However, researchers at St. Jude Children's Research Hospital discovered that the cancer originates from immature precursors that would typically develop into cells lining blood vessels.
Rhabdomyosarcoma is not the only form of cancer that can affect muscles. Cancer can spread to the muscles, but this is uncommon. As tumours grow, individual cancer cells can break off and circulate in the bloodstream, lodging in other organs and forming new growths. This process, called metastasis, is often catastrophic and the cause of most cancer-related deaths. However, skeletal muscle, which makes up 30-40% of a person's body mass, is highly resistant to metastasis.
This mystery led Dr. Sarah Crist, a former PhD student in Dr. Cyrus Ghajar's lab at Fred Hutchinson Cancer Center, to investigate the metabolic state of disseminating tumour cells (DTCs) in the skeletal muscle microenvironment. Dr Crist's study involved redox, or reduction-oxidation, a chemical process that balances the metabolic generation of reactive oxygen species (ROS) with antioxidants. She found that skeletal muscle exhibits a redox imbalance, with a shift towards the creation of ROS, resulting in cellular stress and a highly oxidised state.
Dr Crist's research revealed that sustained oxidative stress in skeletal muscle drives a profound redox imbalance in DTCs, preventing their growth and proliferation. While DTCs can seed skeletal muscle as single cells, they rarely progress past this stage due to the physiological stress the muscle tissue imposes on them. This discovery adds to the evidence that sustained oxidative stress is a hallmark of DTC biology and can be exploited for metastasis prevention. By understanding the mechanisms underlying this resistance, researchers may be able to develop new strategies to prevent metastasis in other tissues.
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Imaging scans and biopsies are used to diagnose LMS
Leiomyosarcoma (LMS) is a rare and aggressive type of cancer that causes tumours to form on the body's smooth, involuntary muscles. It is often found in the uterus but can occur in any of the body's smooth muscles. Doctors can treat and cure LMS when diagnosed in the early stages. However, it becomes more difficult to treat when diagnosed at later stages.
Biopsies are also crucial in diagnosing LMS. During a biopsy, a medical professional removes a small sample of the tumour using a hollow needle so that it can be tested. There are different types of biopsies, including fine needle aspiration, core needle biopsy, and surgical biopsy. In a core needle biopsy, the doctor may numb the area around the growth and use a needle to remove a small piece of tissue. In a surgical biopsy, the doctor may remove the entire growth or a piece of it during surgery.
It is important to get the correct diagnosis to ensure the right treatment for LMS. Treatment options include surgery, radiation therapy, and chemotherapy, depending on the size and location of the tumour.
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Surgery is the best treatment option for LMS
Leiomyosarcoma (LMS) is a rare and aggressive cancer that starts in the smooth muscles of hollow organs like the bladder, stomach, intestines, uterus, or blood vessels. It is often referred to as cancer in the muscles. When detected early, LMS is curable, and surgery is the best treatment option.
Surgery is the go-to treatment option for LMS when possible. The goal of surgery is to remove the entire tumour so that the cancer doesn't come back. The prognosis for LMS is good when it is identified early and removed through surgery, with a high likelihood of full recovery. If the tumour is large or has spread to other parts of the body, treatment becomes more challenging, and the prognosis is not as favourable.
Radiation therapy and chemotherapy are also used in the treatment of LMS. Radiation therapy can be administered before or after surgery. Pre-operative radiation therapy, known as neoadjuvant therapy, is used to shrink the tumour, while post-operative radiation therapy, or adjuvant therapy, aims to kill any remaining cancer cells. Chemotherapy is typically recommended when the tumour is large or when cancer has spread to other areas of the body. It is often used in combination with surgery in these cases.
In addition to these standard treatments, targeted therapy may be recommended as a standalone treatment or in conjunction with other therapies. For uterine LMS, surgery may involve removing the entire uterus, fallopian tubes, ovaries, and in some cases, lymph nodes. Hormone therapy and immunotherapy are also options for more advanced stages of LMS.
Overall, while a range of treatments are available for LMS, surgery is the primary and most effective option when the cancer is detected early. Removing the entire tumour through surgery offers the best chance of a cure and full recovery for patients with LMS.
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Frequently asked questions
While soft tissue sarcoma refers to cancer that begins in the muscle, fat, fibrous tissue, blood vessels, or other supporting tissue of the body, researchers have discovered that a ""muscle cancer" is not really a muscle cancer. Previously, scientists thought that rhabdomyosarcoma, the most prevalent soft tissue cancer in children, arose from immature muscle cells because the tumor resembled muscle under the microscope. However, it has now been discovered that the cancer arises from immature progenitors that would normally develop into cells lining blood vessels.
The discovery that rhabdomyosarcoma is not really a muscle cancer was made because tumors can occur in tissues that don't have skeletal muscle, like the bladder, prostate, and liver. This led researchers to investigate further, and they discovered that the cancer arises from immature progenitors that would normally develop into cells lining blood vessels.
Researchers have found that skeletal muscle is incredibly resistant to metastasis due to sustained oxidative stress in muscle tissue and the physiological stress it places on cancer cells. This discovery has led to the understanding that if we can find a way to sustain high oxidative stress, we might be able to block the growth of disseminating tumor cells and even kill the metastasis-initiating population.
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