FGFBP1 and benign neoplasm of salivary gland: Furthermore, Okamoto et al. (1996a, b) reported that normal epithelial cells derived from the salivary gland and cells derived from pleomorphic adenoma (Okamoto et al. 1996a), a benign salivary gland tumor, also expressed HBp17/FGFBP-1 mRNA.