Low Frequency of Intratumor Heterogeneity in Bladder Cancer Tissue Microarrays

Lovisa Jakobsson, Gunilla Chebil, Nour Al Dain Marzouka, Fredrik Liedberg, Gottfrid Sjödahl

Research output: Contribution to journalArticlepeer-review

10 Citations (SciVal)

Abstract

Background: Intratumoral heterogeneity (ITH) is associated with clinical challenges such as possible differences in response to treatment and difficulties in classifying the tumor. Previously, ITH has been described in bladder cancer using detailed genetic analyses. However, in this disease, it is not known to what extent ITH actually occurs, or if it involves molecular subtyping, when assessment is achieved by immunohistochemistry (IHC) on the protein level using tissue microarrays (TMAs), the method most widely applied when analyzing large sample numbers. Objective: We aimed to investigate ITH by IHC in bladder cancer TMAs. Methods: Staining for eleven immunohistochemical markers (CK5, Cyclin D1, E-Cadherin, EGFR, FGFR, GATA3, HER2, p16, p63, P-Cadherin and RB1)was performed, and differences in staining patterns were assessed both within 1981 individual tissue-cores and by comparing two cores from the same tumor in 948 cases according to our pre-specified criteria. Presence of ITH was associated with clinicopathological data such as stage, grade, molecular subtype and survival. Results: Intracore ITH in one or several markerswas associated with grade 3, stage T1 and the genomically unstable molecular subtype. ITH in three or more markers was found in 5% between cores (intercore heterogeneity) and in 2% within cores (intracore heterogeneity). No association with survival was found for any of the ITH groups. Conclusions: We observed ITH in a small proportion of the tumors, suggesting that ITH has only a limited impact on TMA bladder cancer studies.

Original languageEnglish
Pages (from-to)327-337
Number of pages11
JournalBladder Cancer
Volume4
Issue number3
DOIs
Publication statusPublished - 2018 Jul 30

Subject classification (UKÄ)

  • Cancer and Oncology

Keywords

  • Bladder cancer
  • immunohistochemistry
  • intratumoral heterogeneity

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