TY - JOUR
T1 - Heterogeneity of ERG expression in prostate cancer
T2 - A large section mapping study of entire prostatectomy specimens from 125 patients
AU - Tsourlakis, Maria Christina
AU - Stender, Annegret
AU - Quaas, Alexander
AU - Kluth, Martina
AU - Wittmer, Corinna
AU - Haese, Alexander
AU - Graefen, Markus
AU - Steurer, Stefan
AU - Simon, Ronald
AU - Korbel, Jan
AU - Weischenfeldt, Joachim
AU - Huland, Hartwig
AU - Sauter, Guido
AU - Schlomm, Thorsten
AU - Minner, Sarah
PY - 2016/8/17
Y1 - 2016/8/17
N2 - Background: TMPRSS2:ERG fusions are frequent in prostate cancer, and occur predominantly in young patients. Several studies had proposed intratumoral heterogeneity of these fusions. This study was designed to determine frequency and extent of ERG fusion heterogeneity in early-onset prostate cancer (EO-PCA, <50 years) and in elderly patients. Methods: The prostates from 63 EO-PCA and 62 elderly prostate cancer patients were thoroughly reviewed for presence of cancer foci. All 1592 tumor-containing sections were analyzed by immunohistochemistry for ERG expression. Results: The prostates included in this study contained one tumor focus in 44, two tumor foci in 21, three tumor foci in 32, four tumor foci in 15, and five or more tumor foci in 13 patients. Among 59 cancer foci with ≤3 mm, 19 (32.2 %) were homogeneously ERG positive, 39 66.1 %) were homogeneously ERG negative, and one case (1.7 %) showed a heterogeneous ERG status. The fraction of homogeneously ERG positive cancer foci remained largely constant (14-37 %) with increasing tumor focus diameter but the fraction of heterogeneous ERG findings continuously increased with tumor size and reached 39 % in cancer foci larger than 22 mm. On a patient level, ERG expression was markedly more frequent in EO-PCA than in elderly patients: 13 % of EO-PCA were homogeneously and 62 % were heterogeneously ERG positive. In elderly patients, 3 % of cancers were homogeneously and 57 % were heterogeneously ERG positive (p = 0.0721). Conclusion: These data show that about 20-30 % of prostate cancer foci have early ERG fusions. ERG fusions further occur in about 50 % of initially ERG negative cancer foci during cancer progression. The vast majority of cancers are heterogeneous for TMPRSS2:ERG fusions on a patient level, challenging the concept of classifying prostate cancer patients into "fusion type" and "non-fusion type" prostate cancer.
AB - Background: TMPRSS2:ERG fusions are frequent in prostate cancer, and occur predominantly in young patients. Several studies had proposed intratumoral heterogeneity of these fusions. This study was designed to determine frequency and extent of ERG fusion heterogeneity in early-onset prostate cancer (EO-PCA, <50 years) and in elderly patients. Methods: The prostates from 63 EO-PCA and 62 elderly prostate cancer patients were thoroughly reviewed for presence of cancer foci. All 1592 tumor-containing sections were analyzed by immunohistochemistry for ERG expression. Results: The prostates included in this study contained one tumor focus in 44, two tumor foci in 21, three tumor foci in 32, four tumor foci in 15, and five or more tumor foci in 13 patients. Among 59 cancer foci with ≤3 mm, 19 (32.2 %) were homogeneously ERG positive, 39 66.1 %) were homogeneously ERG negative, and one case (1.7 %) showed a heterogeneous ERG status. The fraction of homogeneously ERG positive cancer foci remained largely constant (14-37 %) with increasing tumor focus diameter but the fraction of heterogeneous ERG findings continuously increased with tumor size and reached 39 % in cancer foci larger than 22 mm. On a patient level, ERG expression was markedly more frequent in EO-PCA than in elderly patients: 13 % of EO-PCA were homogeneously and 62 % were heterogeneously ERG positive. In elderly patients, 3 % of cancers were homogeneously and 57 % were heterogeneously ERG positive (p = 0.0721). Conclusion: These data show that about 20-30 % of prostate cancer foci have early ERG fusions. ERG fusions further occur in about 50 % of initially ERG negative cancer foci during cancer progression. The vast majority of cancers are heterogeneous for TMPRSS2:ERG fusions on a patient level, challenging the concept of classifying prostate cancer patients into "fusion type" and "non-fusion type" prostate cancer.
KW - ERG
KW - Heterogeneity
KW - Prostate cancer
UR - http://www.scopus.com/inward/record.url?scp=84982170350&partnerID=8YFLogxK
U2 - 10.1186/s12885-016-2674-6
DO - 10.1186/s12885-016-2674-6
M3 - Journal article
C2 - 27530104
AN - SCOPUS:84982170350
SN - 1471-2407
VL - 16
JO - BMC Cancer
JF - BMC Cancer
IS - 1
M1 - 641
ER -