Cutaneous T-cell Lymphoma

Cutaneous T-cell lymphoma is a rare group of blood cancers that primarily affects the skin, often appearing as patches or rashes that can be mistaken for common skin conditions like eczema or psoriasis for years before diagnosis.

Table of contents

• What is Cutaneous T-cell Lymphoma?
• Main Types of Cutaneous T-cell Lymphoma
• How Common is This Condition?
• Signs and Symptoms
• Causes and Risk Factors
• Diagnosis
• Outlook and Prognosis
• Treatment Approaches
• Living with the Condition

What is Cutaneous T-cell Lymphoma?

Cutaneous T-cell lymphoma, often called CTCL, is a rare type of cancer that begins in white blood cells called T cells (also known as T lymphocytes). These cells are an important part of the body’s defense system that fights off infections. In this condition, the T cells become abnormal and attack the skin rather than protecting it^[1].

CTCL is part of a larger group of cancers called non-Hodgkin lymphoma. Unlike other lymphomas that start in lymph nodes or other organs, cutaneous T-cell lymphomas begin in the skin itself and may remain there for many years^[4].

This is not a typical “skin cancer” in the way most people understand the term. Skin cancers usually develop from cells that make up the skin itself. CTCL, by contrast, develops from immune system cells that have moved into the skin^[3].

• Skin
• Lymph nodes
• Blood

Main Types of Cutaneous T-cell Lymphoma

There are several types of cutaneous T-cell lymphoma, but two are most common^[1]:

Mycosis fungoides is the most common type, accounting for about half of all CTCL cases. It grows very slowly and mainly affects the skin. People with mycosis fungoides typically develop patches of discolored, scaly skin that can be itchy. These patches often appear on areas of the body that don’t get much sun exposure, particularly around the pelvic area^[3][12]. The disease usually progresses slowly through several stages, starting with flat patches, then developing into raised plaques, and sometimes forming tumor-like growths^[5].

Sézary syndrome is a less common but more aggressive form of CTCL. It grows and spreads more quickly than mycosis fungoides. In Sézary syndrome, large numbers of abnormal T cells are found not just in the skin but also in the bloodstream. This condition often causes widespread redness and irritation of the skin over much of the body^[1][2].

Other less common types include primary cutaneous anaplastic large cell lymphoma, lymphomatoid papulosis, and several other rare forms^[5].

How Common is This Condition?

Cutaneous T-cell lymphomas are rare. Approximately 3,000 new cases are reported in the United States each year^[3]. In the United Kingdom, only around 150 people are diagnosed with CTCL annually^[4].

The condition is more common in certain groups of people. Men are affected more often than women, with rates roughly 1.6 to 2 times higher in men^[5]. CTCL typically affects adults, with most people diagnosed in their 50s or 60s^[3][5]. By age 70, there is a four-fold increase in the number of cases^[3].

The condition is more common in Black individuals compared to other racial groups^[2]. Because the disease develops slowly and can be difficult to diagnose, there are likely many more people living with CTCL than current numbers suggest^[3].

Signs and Symptoms

The signs and symptoms of cutaneous T-cell lymphoma can vary depending on the type and stage of the disease. Many people have symptoms for years before receiving a correct diagnosis because the skin changes can look like other common skin conditions^[2].

Common symptoms include^[1][2]:

• Patches of skin that are raised, scaly, or discolored (may appear red on lighter skin, or lighter or darker than surrounding skin on darker skin tones)
• Intense itching, which can sometimes interfere with sleep
• Dry, flaky skin
• Bumps on the skin that might break open
• Swollen lymph nodes
• Hair loss
• Thickened skin on the palms of the hands and soles of the feet
• Widespread redness and irritation (in cases of Sézary syndrome)

In mycosis fungoides, the affected skin areas are often well-defined, asymmetrical patches and plaques. The skin may appear thin and wrinkled with fine scales, typically appearing on sun-protected areas of the body^[12].

In early stages, CTCL can easily be mistaken for eczema or psoriasis^[2][4]. This is one reason why diagnosis can take a long time.

Causes and Risk Factors

Healthcare providers don’t know exactly what causes cutaneous T-cell lymphoma. The condition occurs when T lymphocytes undergo changes that turn them into cancer cells. These abnormal cells then multiply without control^[2].

Researchers have identified some possible explanations^[2]:

Genetic changes: Some gene mutations have been identified that might cause these conditions. However, no single specific cause has been found.

Infections: When the body fights an infection, the immune system works harder and the bone marrow creates more lymphocytes more quickly. This increased production speed may lead to mistakes in the cells’ DNA, which could eventually cause lymphoma.

Several factors increase the risk of developing CTCL^[2]:

• Being Black
• Being over 50 years old
• Having a weakened immune system
• Being male

Diagnosis

Diagnosing cutaneous T-cell lymphoma can be difficult and often takes time. The symptoms are similar to many other, more common skin conditions. It’s not unusual for people to have symptoms for years before receiving the correct diagnosis^[2].

A healthcare provider will start by reviewing your medical history and conducting a physical examination, focusing on any patches or thickened areas on your skin. They will ask about your symptoms and any prior health conditions^[2].

Several tests may be used to diagnose CTCL^[1][2][10]:

Skin biopsy: This is the main test used to diagnose CTCL. During a skin biopsy, a healthcare provider removes a small sample of affected skin. A specialist doctor called a pathologist examines it under a microscope, looking for cancer cells. Because diagnosis can be challenging, you may need more than one biopsy over several weeks or months^[4][10].

Blood tests: Blood tests can provide information about your overall health and may show whether cancer cells are present in the blood. This is especially important in Sézary syndrome^[1][10].

Imaging tests: If your doctor diagnoses lymphoma, you might have additional tests such as CT scans or PET-CT scans to see if the disease has spread to other parts of the body^[4].

Lymph node biopsy: If lymph nodes are swollen, a sample may be taken to check for cancer cells^[4].

You will likely see several types of doctors during diagnosis and treatment, including a skin specialist (dermatologist), a blood disease specialist (hematologist), and a cancer specialist (oncologist)^[4].

Outlook and Prognosis

Most types of cutaneous T-cell lymphoma grow very slowly and are not immediately life-threatening. Many people with CTCL can live normal lives while managing their condition^[2][3].

The outlook depends largely on the stage of disease when it is diagnosed. Stage refers to how much of the body is affected^[13]:

People with early-stage disease (stage IA) that is confined to the skin have a very good outlook, with a median survival of 20 years or more. Most deaths in this group are not caused by or related to the lymphoma^[13].

In contrast, more than half of patients with advanced disease (stages III to IV) die from the lymphoma, with shorter survival times^[13].

Several factors affect prognosis^[13]:

• Stage IV disease
• Being older than 60 years
• Large cell transformation (when cells change to a more aggressive form)
• Elevated lactate dehydrogenase (a substance in the blood)

Most cutaneous T-cell lymphomas are considered “indolent” or slow-growing. This means they are treatable but usually not curable, and typically not immediately life-threatening^[3]. The disease can be managed over many years, with symptoms that come and go.

Treatment Approaches

Treatment for cutaneous T-cell lymphoma depends on the type of CTCL, the extent of skin involvement, and whether the cancer has spread to lymph nodes or other organs^[15]. Many people live normal lives while treating their disease, and some are able to remain in remission for long periods^[15].

For very slow-growing types of CTCL with minimal disease, treatment might not need to start right away. Instead, doctors might recommend active monitoring, often called “watch and wait”^[4].

Treatment options fall into two main categories:

Skin-directed therapies are treatments that are applied or work directly on the skin. These are generally used for earlier stages of disease and include^[14][15]:

• Topical corticosteroids: Steroid creams, gels, or ointments that reduce inflammation and kill lymphoma cells. They can be very helpful in relieving itching.
• Topical chemotherapy: Medications like mechlorethamine (available as a gel called Valchlor) that are applied to the skin to prevent cancer cells from growing.
• Light therapy (phototherapy): Treatment using ultraviolet light to target affected skin areas.
• Radiation therapy: Using high-energy rays to treat specific areas of affected skin.

Skin-directed therapies often have minimal side effects because they work mostly on the skin surface without much absorption into the bloodstream. Patients can often use these treatments for a long time^[14].

Systemic treatments work throughout the entire body. These may be used in more advanced stages or when skin-directed therapies haven’t helped. Systemic treatments include^[15]:

• Extracorporeal photopheresis (a treatment that processes blood outside the body)
• Various medications taken by mouth or given through a vein, such as bexarotene, interferons, or chemotherapy drugs
• FDA-approved medications like romidepsin (Istodax) and vorinostat (Zolinza)

Treatments may be prescribed alone or in combination to achieve the best results. It’s common to try several different treatments before finding the one or combination that works best^[16].

Living with the Condition

Living with cutaneous T-cell lymphoma presents physical, emotional, and practical challenges. Because CTCL is a chronic disease, you may live with it for many years. Symptoms can come and go, and you may have periods of remission followed by periods when symptoms return^[16].

Physical symptoms: Common physical challenges include severe itching that may interfere with sleep, hot and sore skin (which can be a sign of infection), flaking or burning skin, and difficulty finding comfortable clothing. Your normal daily routine may take extra time and energy^[16].

Skin care: Taking good care of your skin is important. This includes keeping skin moisturized, avoiding irritants, and watching for signs of infection^[17][21]. Managing body temperature can be challenging, especially with widespread skin involvement^[22].

Emotional impact: Having visible skin lesions or changes can affect self-confidence and body image. People who were previously confident about their appearance may become self-conscious when lesions appear on visible areas like the face, neck, or legs^[16]. The unpredictable nature of the disease—with periods of remission and flare-ups—can be emotionally challenging.

Support and coping: Talking with trusted friends and family, your healthcare team, and others who have experienced the disease can help ease the challenges. Many patients find it helpful to connect with support groups or other people living with CTCL^[16].

Working with your healthcare team: It’s important to work closely with your doctors to find the best treatment approach for you at each stage of your disease. Treatment options may change over time, and new therapies are steadily becoming available^[16].

Many people with CTCL, especially those with early-stage disease, continue to lead full and active lives while managing their condition. Understanding your disease, staying informed about treatment options, and maintaining open communication with your healthcare team are key to living well with cutaneous T-cell lymphoma.