Significance of sentinel node biopsy in the management of squamous cell carcinoma arising from recessive dystrophic epidermolysis bullosa.

The most life-threatening complication developing in patients with recessive dystrophic epidermolysis bullosa (RDEB) is squamous cell carcinoma (SCC). To improve patient prognosis, early detection of regional lymph node metastasis is required. Herein, we report a patient diagnosed with non-Hallopeau-Siemens RDEB who developed SCC on the left foot with inguinal lymph node swelling. Use of the sentinel node biopsy (SNB) technique favorably minimized defective damage to the inguinal region in this case. Genetic analysis identified one novel COL7A1 mutation, a maternal c.238G > C (p.A80P) and one previously reported mutation, a paternal c.3631C > T (p.Q1211X). A published work review demonstrated that no COL7A1 mutations specific for SCC development in RDEB have previously been identified. It remains unclear if SNB in combination with gene diagnosis is beneficial for the management of SCC in RDEB patients, however, because of the limited number of case reports. To address this issue, COL7A1 mutational analysis should be performed in as many cases of RDEB as possible.