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J Urol. 2016 Jan;195(1):180-7. doi: 10.1016/j.juro.2015.07.113. Epub 2015 Aug 20.

Clear Cell Renal Cell Carcinoma Subtypes Identified by BAP1 and PBRM1 Expression.

Author information

1
Division of Medical Oncology, Departments of Health Sciences Research and Medicine and Division of Cancer Biology, Mayo Clinic Florida, Jacksonville, Florida; Department of Pathology, Kidney Cancer Program, Simmons Comprehensive Cancer Center, Division of Hematology-Oncology, Department of Internal Medicine and Department of Developmental Biology, University of Texas Southwestern Medical Center, Dallas, Texas; Department of Health Sciences Research, Mayo Clinic Rochester, Rochester, Minnesota; Division of Medical Oncology, Mayo Clinic Arizona, Phoenix, Arizona. Electronic address: joseph.richard@mayo.edu.
2
Division of Medical Oncology, Departments of Health Sciences Research and Medicine and Division of Cancer Biology, Mayo Clinic Florida, Jacksonville, Florida; Department of Pathology, Kidney Cancer Program, Simmons Comprehensive Cancer Center, Division of Hematology-Oncology, Department of Internal Medicine and Department of Developmental Biology, University of Texas Southwestern Medical Center, Dallas, Texas; Department of Health Sciences Research, Mayo Clinic Rochester, Rochester, Minnesota; Division of Medical Oncology, Mayo Clinic Arizona, Phoenix, Arizona.
3
Division of Medical Oncology, Departments of Health Sciences Research and Medicine and Division of Cancer Biology, Mayo Clinic Florida, Jacksonville, Florida; Department of Pathology, Kidney Cancer Program, Simmons Comprehensive Cancer Center, Division of Hematology-Oncology, Department of Internal Medicine and Department of Developmental Biology, University of Texas Southwestern Medical Center, Dallas, Texas; Department of Health Sciences Research, Mayo Clinic Rochester, Rochester, Minnesota; Division of Medical Oncology, Mayo Clinic Arizona, Phoenix, Arizona. Electronic address: james.brugarolas@utsouthwestern.edu.

Abstract

PURPOSE:

In clear cell renal cell carcinoma BAP1 and PBRM1 are 2 of the most commonly mutated genes (10% to 15% and 40% to 50%, respectively). We sought to determine the prognostic significance of PBRM1 and BAP1 expression in clear cell renal cell carcinoma.

MATERIALS AND METHODS:

We used immunohistochemistry to assess PBRM1 protein expression in 1,479 primary clear cell renal cell carcinoma tumors that were previously stained for BAP1. A centralized pathologist reviewed all cases and categorized tumors as positive or deficient for PBRM1 and BAP1. Kaplan-Meier and Cox regression models were used to evaluate association of PBRM1 and BAP1 expression with the risk of death from renal cell carcinoma and the risk of metastasis after adjustment for age and the Mayo Clinic SSIGN (stage, size, grade and necrosis) score.

RESULTS:

PBRM1 and BAP1 expression was PBRM1+ BAP1+ in 40.1% of tumors, PBRM1- BAP1+ in 48.6%, PBRM1+ BAP1- in 8.7% and PBRM1- BAP1- in 1.8%. The incidence of PBRM1 and BAP1 loss in the same tumor was significantly lower than expected (actual 1.8% vs expected 5.3%, p <0.0001). Compared to patients with PBRM1+ BAP1+ tumors those with PBRM1- BAP1+ lesions were more likely to die of renal cell carcinoma (HR 1.39, p = 0.035), followed by those with PBRM1+ BAP1- and PBRM1- BAP1- tumors (HR 3.25 and 5.2, respectively, each p <0.001). PBRM1 and BAP1 expression did not add independent prognostic information to the SSIGN score.

CONCLUSIONS:

PBRM1 and BAP1 expression identified 4 clinical subgroups of patients with clear cell renal cell carcinoma who had divergent clinical outcomes. The clinical value of these biomarkers will be fully realized when therapies targeting pathways downstream of PBRM1 and BAP1 are developed.

KEYWORDS:

biological markers; carcinoma; genes; kidney; mortality; renal cell; tumor suppressor

PMID:
26300218
PMCID:
PMC5221690
DOI:
10.1016/j.juro.2015.07.113
[Indexed for MEDLINE]
Free PMC Article

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