Basal Cell Carcinoma

In most cases, basal cell carcinoma develops due to long-term UV exposure and individual predisposition. One key cause is DNA damage in skin cells. This damage is caused by radiation, especially UVB light. Repeated sunburn, intense sun exposure and regular use of tanning beds can gradually change the genes in the basal cells of the skin. If the body can no longer repair the damaged DNA well enough, certain signaling pathways may remain active. These include pathways involving genes such as PTCH1 and SMO. As a result, the affected cells lose their normal growth control. They start to divide unchecked and may form a basal cell carcinoma over time.

Risk factors that can further increase the risk of basal cell carcinoma include:

• very fair, sun-sensitive skin, especially skin types I and II, with blond or red hair and light eyes
• a tendency to sunburn
• older age, because UV damage builds up over a lifetime
• strong sun exposure at work or during leisure activities
• long-term use of immunosuppressive medication
• previous X-ray treatment or radiation therapy of the skin
• exposure to certain chemicals, such as arsenic
• rare genetic conditions, such as Gorlin-Goltz syndrome

Despite these known links, it is not always clear why a basal cell carcinoma develops in one specific place at one specific time. In most cases, UV exposure and individual vulnerability of the skin cells work together. This is why consistent sun protection, regular skin checks and early assessment of suspicious skin changes are important. They support prevention and early detection of basal cell carcinoma.

Basal cell carcinoma symptoms can begin with small skin changes. At first, these changes may look harmless. Many people do not recognize them as a form of skin cancer. A typical sign is a skin change that remains for weeks or months and grows slowly. Basal cell carcinoma may appear as a small, glassy, shiny or skin-colored bump. Fine red blood vessels may be visible inside it. The bump often looks harmless. In other cases, basal cell carcinoma appears as a flat, reddish brown patch. It may scale slightly and resemble eczema or mild inflammation.

Over time, basal cell carcinoma may sink in at the center. It may also form crusts or bleed slightly. These are important warning signs. A skin area that repeatedly breaks open, oozes or bleeds without a clear reason may point to basal cell carcinoma. This is especially true if it does not heal despite skin care. In contrast to many other skin conditions, basal cell carcinoma usually causes no pain at first. It also rarely causes itching. This is why the skin change is often considered harmless. Pain, tightness or local irritation may occur later. This is more likely if the tumor has grown into deeper structures.

Typical warning signs include:

• new skin changes with features typical of basal cell carcinoma
• changes that remain for weeks or months
• skin areas that slowly grow larger
• skin changes that keep appearing in the same place
• wounds or sores that do not heal

The behavior of the skin can also suggest basal cell carcinoma, for example:

• repeated crusting
• mild spontaneous bleeding
• changes in shape, surface or border

Basal cell carcinomas most often appear on areas that receive a lot of sun. These include the face, nose, ears, forehead, scalp and backs of the hands. They are especially common in people with fair skin or known sun damage.

Even small or harmless-looking skin changes should be checked by a doctor. This is especially important if they do not go away or stay unchanged. The earlier basal cell carcinoma is detected and removed, the lower the risk of permanent damage to nearby tissue.

The diagnosis of basal cell carcinoma mainly starts with a clinical skin examination. Patients often come to the doctor because of skin areas that do not heal or keep changing. First, the doctor assesses the shape, color, border and surface of the area. The doctor also looks for typical signs. These include a shiny surface, pearl-like edges, fine blood vessels or recurring crusts. The appearance alone often raises suspicion of basal cell carcinoma. This is especially true if the skin change does not go away over time.

Dermoscopy is important for diagnosis. This means examining the skin change with a special light microscope. It allows the doctor to see structures more clearly. It can also show typical patterns. These may include blood vessel patterns, translucent areas or structures linked to basal cell carcinoma. Dermoscopy helps distinguish basal cell carcinoma from benign skin changes and other forms of skin cancer.

A final diagnosis can only be made through histological examination. For this, the doctor removes either a small tissue sample or the whole suspicious area. The tissue is then examined under a microscope in the laboratory. Only the histological result confirms whether it is basal cell carcinoma. It can also classify the tumor into different subtypes. Imaging tests are usually not needed. They may be used if the tumor may have grown into deeper structures, such as bone. They may also be considered if the tumor has returned several times.

Basal cell carcinoma treatment aims to remove the tumor completely. The goal is to stop the cancer cells and their local growth. Because basal cell carcinoma spreads only very rarely, treatment mainly focuses on local tumor control. The choice of treatment depends on several factors. These include tumor size, location, subtype, general health, and cosmetic or functional aspects.

The standard treatment is surgical removal of the basal cell carcinoma. The tumor is cut out under local anesthesia with a safety margin of healthy tissue. The removed tissue is then examined histologically. This confirms whether the tumor was fully removed. In sensitive areas, such as the face, nose, eyelids or ears, Mohs micrographic surgery is often used. In this procedure, the basal cell carcinoma is removed layer by layer. Each layer is checked under the microscope right away.

For smaller superficial basal cell carcinomas, non-surgical methods may also be used. These include curettage with electrocautery. In this procedure, the tumor is scraped away and the wound surface is cauterized. Other options include cryotherapy and photodynamic therapy. In photodynamic therapy, a light-sensitive substance is applied to the area. The area is then treated with a special light. Photodynamic therapy is mainly suitable for flat or superficial basal cell carcinomas. It often gives good cosmetic results. However, it is not suitable for every subtype of basal cell carcinoma.

In advanced or inoperable basal cell carcinoma, systemic therapies may be used. This applies especially to metastatic basal cell carcinoma or tumors that are very advanced locally. These therapies include hedgehog pathway inhibitors. They can target the disturbed signaling pathway that helps basal cell carcinoma grow. These medicines are mainly used when surgery or radiation therapy is not enough or not suitable.

Supportive complementary medical measures are often used as well. Methods such as acupuncture, physiotherapy or fascial treatments may help after larger surgical procedures. Nutritional medical advice may also support patients. These measures can help relieve pain, stress, muscle tension, sleep disorders or general exhaustion. Acupuncture and mind-body methods may improve well-being. They may also reduce symptoms such as pain, nausea or anxiety.

In general, basal cell carcinoma treatment follows a holistic concept. Conventional medical treatments and complementary methods are combined in a sensible way. The aim is not only to remove the tumor. It is also to support quality of life and body awareness over the long term.

The basal cell carcinoma prognosis is usually very good. If the tumor is found early and fully removed, the chances of successful treatment are especially good. The recurrence rate means the risk that the tumor returns in the same place. It depends on tumor type, location, size and treatment method. After surgical removal, the recurrence rate is often low. However, people who have had basal cell carcinoma have a higher risk of further basal cell carcinomas or other types of skin cancer. Regular follow-up checks and consistent sun protection are therefore important for long-term aftercare.

The information listed contains relevant topics and serves to improve understanding.