1. Cutaneous apocrine carcinoma with elevated serum cytokeratin 19 fragment 21‐1 (CYFRA 21‐1)
   Mao Fujioka et al, 2019, The Journal of Dermatology CrossRef
2. Large subcutaneous tumor of the left shoulder
   José M. Olmos-Martínez et al, 2017, European Journal of Internal Medicine CrossRef
3. CYFRA 21-1: a suitable tumor marker in patients with head and neck cutaneous squamous cell carcinoma?
   Stefan A. Rudhart et al, 2019, European Archives of Oto-Rhino-Laryngology CrossRef