What is an angiosarcoma?
Angiosarcoma is an uncommon malignant tumour (cancer) that arises from the cells that are normally used to make up the walls of the blood or lymphatic vessels. Haemangiosarcomas start in blood vessel walls and lymphangiosarcomas start in lymph vessel walls.
Angiosarcomas may occur in any organ of the body but are more frequently found in skin and soft tissue. They can also originate in the liver, breast, spleen, bone or heart.
What causes angiosarcoma?
The cause of angiosarcoma is usually unknown. The tumour may develop as a complication of a pre-existing condition. Certain patient groups may be at greater risk of developing angiosarcomas, these include:
- Patients with chronic lymphoedema (accumulation of lymph fluid in the arms) whom have undergone a radical mastectomy for breast cancer (removal of breast and all lymph nodes under the arm)
- Radiotherapy patients (especially those who have been exposed to radiation emitting contrast agent Thorotrast – this agent is no longer used but angiosarcomas have occurred in people decades after exposure)
- Patients with foreign material (such as Dacron, shrapnel, steel, and plastic) in the body
- Patients exposed to environmental agents such as sprays containing arsenic, and vinyl chloride in the plastic industry.
What are the signs and symptoms of angiosarcoma?
The signs and symptoms of angiosarcoma differ according to the location of the tumour. Often symptoms of the disease are not apparent until the tumour is well advanced.
Cutaneous angiosarcoma is the most common form of angiosarcoma not associated with chronic lymphoedema. The disease is primarily located on the head and neck of elderly persons and is also known as Wilson-Jones angiosarcoma, senile angiosarcoma or malignant angioendothelioma.
Clinical features of this form of angiosarcoma are:
- Lesions most commonly appear on the scalp or upper forehead.
- In the early stages of disease lesions may be singular or multifocal, slow spreading patches of livid or dusky red colour, somewhat like an ill-defined bruise.
- Lesions may develop into elevated nodules or plaques that may bleed and ulcerate.
- Lesions grow rapidly and spread, making margins difficult to define.
What is the treatment of angiosarcoma?
Treatment of angiosarcoma is dependent on the location of the angiosarcoma and the extent of the tumour. Treatment includes chemotherapy, surgery, radiotherapy, or a combination of these treatment modalities.
The optimum treatment of cutaneous angiosarcoma has not been defined. These angiosarcomas are difficult to treat because of their multifocal nature and extensive spread pattern. Radical surgery and postoperative radiotherapy is generally used but tumour recurrence is common after treatment. Despite aggressive treatment, prognosis is poor.
Paclitaxel is potent antiangiogenic drug that shows promise in the management of angiosarcoma when given weekly.