( ( ( ( ( Chromosomal ( region 17q23 ) ) ( ( is frequently ) ( amplified ( in ( breast cancer ) ) ) ) ) but ) ( ( the genes ) ( involved ( in ( ( this amplification ) ( are ( not ( yet known ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (JJ Chromosomal) (NN region) (NNS 17q23)) (VP (VBZ is) (ADVP (RB frequently)) (VP (VBN amplified) (PP (IN in) (NP (NN breast) (NN cancer)))))) (CC but) (S (NP (DT the) (NNS genes)) (VP (VBN involved) (PP (IN in) (NP (NP (DT this) (NN amplification)) (VP (VBP are) (RB not) (ADVP (RB yet)) (VBN known)))))) (. .)))
Chromosomal region 17q23 is frequently amplified in breast cancer but the genes involved in this amplification are not yet known.
(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))))) (. .)))