Unresectable endocrine mucin-producing sweat gland carcinoma revealing an actionable somatic CHEK2 gene mutation - S. Tzoumpa; C. Béjar; B. Villette; B. Louveau; L. Zelek; A. Martin; O. Briard; D. Bitout; F. Caux; M. Battistella; S. Mourah; E. Maubec (EJC Skin Cancer)