However, in another study conducted by Edwards et al., (2003), they studied the c-kit expression in 49 salivary gland neoplasms (17 polymorphous adenocarcinoma, 17 monomorphous adenomas and 15 adenoid cystic carcinomas), and explained that c-kit did not appear to be helpful marker in distinguishing between adenoid cystic carcinoma from polymorphous adenocarcinoma. This evidence concerns the gene KIT and adenoma.