Flow cytometric evaluation of multicystic dysplastic kidneys

Area of Science:

• Urology
• Pediatric Nephrology
• Oncology

Background:

• The optimal management for multicystic dysplastic kidney (MCDK) is uncertain, particularly regarding long-term malignancy risk.
• While an association between renal dysplasia and neoplasia is suspected, only a few cases of malignancy in MCDK have been reported.
• Nephroblastomatosis, a potential Wilms tumor precursor, is found in 5-7% of MCDK cases when specifically investigated.

Purpose of the Study:

• To investigate the relationship between renal dysplasia and neoplasia by analyzing cellular deoxyribonucleic acid (DNA) content in MCDK specimens.
• To determine if DNA ploidy abnormalities are present in multicystic dysplastic kidneys, potentially indicating a predisposition to cancer.

Main Methods:

• Flow cytometric evaluation was performed on 30 archival, formalin-fixed, paraffin-embedded multicystic dysplastic kidney specimens.
• Nuclear DNA ploidy studies utilized single dissociated nuclei stained with propidium iodide.
• Analysis focused on identifying diploid, tetraploid, or aneuploid DNA patterns and cell cycle fractions (G0/G1 and S/G2/M).

Main Results:

• None of the examined MCDK specimens showed evidence of malignancy.
• All 30 specimens exhibited a diploid DNA pattern, including three with nephroblastomatosis or significant papillary growth.
• No tetraploid or aneuploid DNA patterns were detected; mean G0/G1 fraction was 85.94% and mean S/G2/M fraction was 12.54%.

Conclusions:

• The study found a diploid DNA pattern in all analyzed multicystic dysplastic kidneys.
• These findings do not confirm or exclude an association between MCDK and the potential for future neoplasm development.
• A diploid DNA profile does not rule out the possibility of malignancy developing later in kidneys with multicystic dysplastic changes.