Matrix metalloproteinase-9 is differentially expressed in nonfunctioning invasive and noninvasive pituitary adenomas and increases invasion in human pituitary adenoma cell line. - Hussaini IM; Trotter C; Zhao Y; Abdel-Fattah R; Amos S; Xiao A; Agi CU; Redpath GT; Fang Z; Leung GK; Lopes MB; Laws ER Jr (The American journal of pathology, 2007)