FN1 and thyroid gland undifferentiated (anaplastic) carcinoma: Using a similar approach, Izawa et al. [120] screened a phage cDNA expression library prepared from anaplastic thyroid carcinoma (ATC) tissue with an autologous serum to identify two immunogenic TAAs recognized by patient’s autoantibodies, represented by WD repeat domain 1 protein (WDR1) and fibronectin 1 (FN1).