What is Dermatofibrosarcoma Protuberans (DFSP)

Dermatofibrosarcoma protuberans (DFSP) is a rare, slow-growing type of soft tissue sarcoma that begins in the middle layer of the skin (the dermis). While it is locally aggressive and can grow into underlying fat, muscle, or bone, it rarely spreads to distant organs, making early surgical intervention highly effective.

What is Dermatofibrosarcoma Protuberans (DFSP)?

Dermatofibrosarcoma protuberans (DFSP) is a fibrohistiocytic tumor known for its tendency to recur locally if not completely removed. It often starts as a firm, flesh-colored, or reddish-brown patch or nodule on the skin that may be mistaken for a scar or a benign cyst. Because the growth is often painless and slow, patients may not notice it for years before seeking a diagnosis.

Who is typically affected by Dermatofibrosarcoma Protuberans (DFSP)?

Dermatofibrosarcoma protuberans (DFSP) has an estimated annual incidence of approximately 0.8 to 5 cases per million people. It most commonly affects adults between the ages of 20 and 50, though it can occur at any age. Current data suggests a relatively equal distribution between genders, and there are no known geographic or ethnic predilections associated with the disease.

What causes Dermatofibrosarcoma Protuberans (DFSP)?

The development of Dermatofibrosarcoma protuberans (DFSP) is linked to a specific genetic change. In the vast majority of cases, the tumor cells harbor a translocation between chromosomes 17 and 22. This rearrangement fuses the COL1A1 and PDGFB genes, resulting in the overproduction of a growth factor that drives the uncontrolled proliferation of skin cells. Key characteristics of the disease include:

• Slow progression: Growth is typically very gradual over several years.


• Infiltrative growth: The tumor often has "tentacle-like" projections that extend into healthy tissue, necessitating wide surgical margins.


• Low metastatic potential: While local recurrence is common, spread to lymph nodes or distant organs occurs in less than 5% of cases.

How is Dermatofibrosarcoma Protuberans (DFSP) managed?

Management of Dermatofibrosarcoma protuberans (DFSP) primarily involves surgical removal. Mohs micrographic surgery is frequently recommended because it allows surgeons to examine the tissue margins in real-time to ensure the entire tumor is excised while sparing as much healthy skin as possible. For the 172 members of our DiseaseMaps community, sharing experiences with reconstructive options and long-term surveillance has been a vital part of the recovery journey.

Next steps

• Consult a dermatologic surgeon or an oncologist specializing in soft tissue sarcomas.


• Request a biopsy to confirm the diagnosis, as clinical appearance alone is often insufficient.


• Connect with the 172 individuals living with Dermatofibrosarcoma protuberans (DFSP) on DiseaseMaps.org for peer support.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment; always seek the advice of your physician regarding any medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Dermatofibrosarcoma protuberans.


• Orphanet: Dermatofibrosarcoma protuberans (ORPHA:2284).


• OMIM (Online Mendelian Inheritance in Man): #607963.


• National Cancer Institute (NCI): Soft Tissue Sarcoma Treatment.