Original article
GATA3 immunohistochemical expression in invasive urothelial carcinoma

https://doi.org/10.1016/j.urolonc.2016.04.016Get rights and content

Abstract

Introduction

GATA binding protein 3 (GATA3) is a transcription factor, which belongs to a distinct family of tumor suppressor genes. It is involved in human cancer cell growth and differentiation, and plays an important role in cell proliferation and apoptosis. Although, its expression has been reported in various cancers, there are limited data in genitourinary malignancies. Recent studies found GATA3 to be a sensitive marker for urothelial carcinoma (UC) and associated with prognostic pathologic features. Its level of expression was found to be an independent factor predicting cancer recurrence.

Methods and materials

In this article, immunohistochemical evaluation of GATA3 expression in genitourinary malignancies (invasive UC, renal cell carcinoma, and prostatic adenocarcinomas) was performed.

Results

GATA3 was positive in 56/79 (70.8%) of invasive UC, and was negative in all renal cell carcinoma and prostatic adenocarcinomas. The pattern of GATA3 staining, when positive, was intensely nuclear within the clusters of malignant cells. No cytoplasmic staining was noted. Negative controls were all negative. High GATA3 expression was associated with larger tumor size in invasive UC (3.19 cm vs. 1.65 cm, P = 0.01). GATA3 expression did not correlate with other clinicopathologic parameters in UC.

Conclusions

This data suggest that GATA3 is a sensitive marker in confirming invasive UC, and may be helpful in differentiating it from metastatic tumors of renal and prostatic origin. Furthermore, strong GATA3 expression was noted to have an effect on tumor size in patients with UC.

Introduction

Morphology of invasive high-grade urothelial carcinoma (UC) is not always specific and may demonstrate an appearance that overlaps with other invasive carcinomas. Given this morphologic overlap of high-grade UC with other high-grade metastatic tumors like prostatic adenocarcinoma and squamous cell carcinoma (SCC), immunohistochemistry (IHC) is helpful in the assessment of a high-grade carcinoma of the genitourinary (GU) tract when the primary site is not certain.

GATA3 (GATA binding protein 3 to DNA sequence [A/T] GATA [A/G]) is a transacting T-cell specific transcription factor, which is encoded by the GATA3 gene, and plays an important role in endothelial cell biology [1], [2]. It has 2 zinc fingers at the carboxyl terminus and belongs to a distinct family of tumor genes that has tumor suppressor function. GATA3 has an important role in promoting cell proliferation and differentiation in many tissues and cell types such as T lymphocytes, thymocytes, luminal glandular epithelial cells of the mammary gland, sympathetic nervous system, and in hair follicles of the skin [3], [4], [5]. It has been found to be a critical regulator of tumor differentiation and its loss underlies the onset of tumor dissemination with an expanding GATA3-negative tumor cell population [6].

GATA3 overexpression has been reported in different cancers such as breast and colorectal carcinoma, and it is associated with malignant progression in those cancers [5], [7]. A recent study revealed that GATA3 positivity in bladder small cell carcinoma is of potential value in differentiating small cell carcinomas of prostate origin from those of bladder origin. It also indicates that GATA3 expression in a small subset of lung small cell carcinoma should be taken into consideration in assigning site of origin in advanced small cell carcinoma cases [8]. Another study showed high GATA3 expression in fine needle aspirates from 25 cases of metastatic high-grade UC [9]. The study highlights that GATA3 has high sensitivity and specificity for detection of metastatic UC, and thus may play an important role in diagnosing metastatic UC in cell blocks samples. In other studies, its infrequent expression has been reported to be a strong and independent predictor and prognostic factor of tumor grade, differentiation, metastasis as well as clinical outcome in various human carcinomas such as gastric adenocarcinoma [10], [11].

GATA3 IHC has been useful in the identification of metastatic tumors such as breast carcinoma [5]; published data on its expression in UCs are increasing [12], [13]. In our current study, we evaluated the expression of GATA3 as a tumor marker in the diagnosis of UC and its differentiation from other GU cancers. In addition, we correlate this immunohistochemical analysis of GATA3 expression with clinicopathologic parameters and survival in patients with UC.

Section snippets

Study group

The study group was composed of 175 GU tumors from patients diagnosed at Emory University Hospital between 2000 and 2013 with tissue available in tissue microarrays (TMAs). The anatomic sites and number of cases of the represented tumors included the following: invasive UC (79); renal cell carcinoma (48); and prostatic adenocarcinoma (48). Malignant melanomas (27) were used as negative controls. TMAs were constructed using two 1.0 mm tissue cores from each neoplasm and were immunostained for

Results

The study included 175 GU tumors, of which 79 were high-grade, high-stage muscle-invasive urothelial, 48 renal cell, and 48 prostatic adenocarcinomas. Table 1 shows the IHC profile for GATA3, PAX8, and PSA in urothelial, renal, and prostatic carcinomas. GATA3 was>20% nuclear positive and Q-score was high (200–300) in 56/79 (70.8%) of UCs, with high sensitivity and specificity (sensitivity 70.8%, specificity 100%, positive predictive values 100%, and negative predictive values 54%) (Table 2);

Discussion

Distinguishing high-grade poorly differentiated UC from other carcinomas such as renal and prostatic can be challenging because of morphologic overlap. Other differential diagnoses that can be considered in the diagnosis of high-grade UC include metastatic SCC of the uterine cervix or anal canal. Pathologists are often confronted with this challenging diagnostic situation, and therefore IHC that can distinguish urothelial from renal and prostatic carcinomas can be useful. Recently, a study on

References (17)

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