Clear cell renal cell carcinoma: multiphasic multidetector CT imaging features help predict genetic karyotypes

Area of Science:

• Radiology
• Oncology
• Genetics

Background:

• Clear cell renal cell carcinoma (ccRCC) is the most common subtype of kidney cancer.
• Karyotypic abnormalities are frequent in ccRCC and are associated with prognosis.
• Understanding the relationship between imaging and genetics can improve diagnosis and treatment.

Purpose of the Study:

• To investigate the correlation between imaging characteristics of ccRCCs on multiphasic multidetector computed tomography (CT) and common karyotypic abnormalities.
• To determine if CT imaging features can predict specific genetic alterations in ccRCC.

Main Methods:

• Retrospective analysis of multiphasic multidetector CT scans from 58 patients with histologically proved and karyotyped ccRCCs.
• Assessment of imaging features including attenuation, contour, calcifications, and neovascularity.
• Correlation of imaging features with specific karyotypic abnormalities using logistic regression and odds ratios.

Main Results:

• Calcifications were less common in ccRCCs with loss of chromosome 3p (7%) compared to those without (37%).
• ccRCCs with loss of chromosome Y showed increased enhancement during the corticomedullary phase (130.0 HU vs 102.5 HU).
• ccRCCs with trisomy 7 showed decreased enhancement (105.8 HU vs 139.3 HU), while those with trisomy 5 showed increased enhancement (115.5 HU vs 83.4 HU) during the excretory phase.

Conclusions:

• The genetic profile of ccRCC influences its imaging appearance on multidetector CT.
• Multiphasic multidetector CT imaging characteristics can potentially indicate cytogenetic differences in ccRCC.
• CT-based imaging may serve as a non-invasive tool to infer genetic alterations in ccRCC.