title: Genetic alterations in the PI3K pathway in prostate cancer.
abstract: Alterations in the PIK3CA and PTEN genes were assessed in 40 prostate tumors (radical prostatectomy samples). Genetic analyses in glands of the highest Gleason pattern within each tumor revealed PIK3CA amplification in 13%, PIK3CA mutations in 3%, PTEN homozygous deletion in 13% and PTEN hemizygous deletion in 8% of the cases analyzed. Supporting the view that PTEN and PIK3CA act in the same PI3K signaling pathway, genetic alterations in the PIK3CA and PTEN genes were mutually exclusive, except in one tumor. Overall, 13 of the 40 (33%) prostate tumors had alterations in the PI3K pathway. For cases with genetic alterations, other tumor areas with lower Gleason patterns as well as non-tumorous prostate glands were also analyzed. Of nine tumors with Gleason score 7, five cases contained the same genetic alterations in tumor areas of Gleason patterns 3 and 4, whereas in another four cases, genetic alterations were detected only in tumor areas of Gleason 4 but not Gleason 3 patterns. There were no alterations in non-tumorous glands. These results suggest that genetic alterations in the PI3K pathway are common in prostate cancer, and occur mainly through PIK3CA amplification and PTEN hemizygous or homozygous deletion. Glands of Gleason pattern 3 are genetically heterogeneous, some containing the same genetic alterations observed in glands of Gleason pattern 4.
authors.affiliation: International Agency for Research on Cancer, Lyon, France.
authors.forename: Xiuju
authors.initials: X
authors.lastname: Sun
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Taku
authors.initials: T
authors.lastname: Homma
authors.forename: Daisuke
authors.initials: D
authors.lastname: Kita
authors.forename: Helmut
authors.initials: H
authors.lastname: Klocker
authors.forename: Georg
authors.initials: G
authors.lastname: Schafer
authors.forename: Peter
authors.initials: P
authors.lastname: Boyle
authors.forename: Hiroko
authors.initials: H
authors.lastname: Ohgaki
mesh_terms: D001483:Base Sequence; D058534:Class I Phosphatidylinositol 3-Kinases; D017931:DNA Primers; D005784:Gene Amplification; D006801:Humans; D008297:Male; D009154:Mutation; D051059:PTEN Phosphohydrolase / Q000235:genetics; D019869:Phosphatidylinositol 3-Kinases / Q000235:genetics*; D011471:Prostatic Neoplasms / Q000201:enzymology / Q000235:genetics*
chemical_list: D017931:DNA Primers; D019869:Phosphatidylinositol 3-Kinases; D058534:Class I Phosphatidylinositol 3-Kinases; C484760:PIK3CA protein, human; D051059:PTEN Phosphohydrolase