Articles

Kidney Cancer

Hypoxia-Inducible Factor 1α Expression in Renal Cell Carcinoma Analyzed by Tissue Microarray

By: Anders Lidgren a, Ylva Hedberg b, Kjell Grankvist c, Torgny Rasmuson d, Anders Bergh b and Börje Ljungberg a lowast

European Urology, Volume 50 Issue 1, December 2006, Pages 1272-1277

Published online: 01 December 2006

Keywords: Hypoxia-inducible factor, HIF-1, RCC, Prognosis, Tissue microarray

Abstract Full Text Full Text PDF (417 KB)

Abstract

Objectives

Angiogenesis is important for tumour progression and metastatic spread. Hypoxia-inducible factor 1α (HIF-1α) is a major factor regulating a number of other angiogenic factors. Renal cell carcinoma (RCC) is a malignancy with a variable clinical course, partly attributable to specific genetic alterations of the different RCC types. We therefore analysed HIF-1α expression using immunohistochemistry and related the results to RCC type and clinicopathologic variables.

Material and methods

We semiquantitatively analysed HIF-1α expression using immunohistological staining of a prepared tissue microarray. There were 216 patients including 176 conventional, 26 papillary, and 14 chromophobe RCCs.

Results

The HIF-1α staining was found mainly in the cytoplasm. The tumours were subdivided into HIF-1αLOW and HIF-1αHIGH on the basis of staining intensity. HIF-1α expression between the RCC types did not differ. Patients with conventional RCC showed a trend (p=0.055) towards a prolonged survival for those with HIF-1αHIGH-staining versus HIF-1αLOW-staining tumors. In conventional RCC there were significant differences in HIF-1α expression in relation to TNM stage, nuclear grade, and vein invasion. In patients with papillary RCC, difference in HIF-1α expression was observed only for nuclear grade.

Conclusions

We studied HIF-1α expression in RCC using tissue microarray. In patients with conventional RCC, HIF-1α levels were significantly lower in locally aggressive tumors versus localized tumors, and patients with high HIF-1α levels tended to have a better prognosis. There seems to be a diverging regulation of angiogenesis between the different RCC types. Further studies of HIF and angiogenesis in RCC are encouraged.

Keywords: Hypoxia-inducible factor, HIF-1α, RCC, Prognosis, Tissue microarray.

Footnotes

a Department of Surgical and Perioperative Sciences, Urology and Andrology, Umeå University, Umeå, Sweden

b Department of Medical Biosciences, Pathology, Umeå University, Umeå, Sweden

c Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden

d Department of Radiation Sciences, Oncology, Umeå University, Umeå, Sweden

lowast Corresponding author. Department of Surgical and Perioperative Sciences, Urology and Andrology, Umeå University, S-901 85 Umeå, Sweden. Tel. +46 90 785 1330; Fax: +46 90 125396.

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