( ( ( ( Frequent amplification ) ( of ( chromosomal region ) ) ) ( 20q12-q13 ( in ( ovarian cancer ) ) ) ) . )
(ROOT (NP (NP (NP (JJ Frequent) (NN amplification)) (PP (IN of) (NP (JJ chromosomal) (NN region)))) (ADJP (JJ 20q12-q13) (PP (IN in) (NP (NN ovarian) (NN cancer)))) (. .)))
Frequent amplification of chromosomal region 20q12-q13 in ovarian cancer.
(ROOT (NP (NP (JJ Duplications) (PRN (-LRB- -LRB-) (CC or) (ADJP (JJ amplifications)) (-RRB- -RRB-)) (NN lead)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-)) (PP (TO to) (NP (NP (JJ multiple) (NNS copies)) (PP (IN of) (NP (DT a) (JJ chromosomal) (NN region))))) (. .)))