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Mehrazin R , Dulaimi E , Uzzo RG , Devarjan K , Pei J , Smaldone MC , Kutikov A , Testa JR , Al-Saleem T
The correlation between gain of chromosome 8q and survival in patients with clear and papillary renal cell carcinoma
Ther Adv Urol. 2018 Jan;10(1) :3-10
PMID: 29344091    PMCID: PMC5761913   
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Abstract
BACKGROUND: The proto-oncogene c-MYC, located on chromosome 8q, can be upregulated through gain of 8q, causing alteration in biology of renal cell carcinoma (RCC). The aim of this study was to evaluate the prevalence of c-MYC through chromosome 8q gain and to correlate findings with cancer-specific mortality (CSM), and overall survival (OS). METHODS: Cytogenetic analysis by conventional or Chromosomal Genomic Microarray Analysis (CMA) was performed on 414 renal tumors. Nonclear and nonpapillary RCC were excluded. Impact of gain in chromosome 8q status on CSM, OS, and its correlation with clinicopathological variables were evaluated. CSM and OS were assessed using log-rank test and the Cox proportional hazards model. RESULTS: A total of 297 RCC tumors with cytogenetic analysis were included. Gain of 8q was detected in 18 (6.1%) tumors (9 clear cell and 9 papillary RCC), using conventional method (n = 11) or CMA (n = 7). Gain of 8q was associated with higher T stage (p < 0.001), grade (p < 0.001), nodal involvement (p = 0.005), and distant metastasis (p < 0.001). No association between gain of 8q and age (p = 0.23), sex (p = 0.46), and Charlson comorbidity index (CCI, p = 0.59) were seen. Gain of 8q was associated with an 8.38-fold [95% confidence interval (CI), 3.83-18.34, p < 0.001] and 3.31-fold (95% CI, 1.56-7.04, p = 0.001) increase in CSM and decrease in OS, respectively, at a median follow up of 56 months. CONCLUSION: Chromosome 8q harbors the proto-oncogene c-MYC, which can be upregulated by gain of 8q. Our findings suggest that gain of 8q, can predict aggressive tumor phenotype and inferior survival in RCC.
Notes
1756-2880 Mehrazin, Reza Dulaimi, Essel Uzzo, Robert G Devarjan, Karthik Pei, Jianming Smaldone, Marc C Kutikov, Alexander Testa, Joseph R Al-Saleem, Tahseen P30 CA006927/CA/NCI NIH HHS/United States Journal Article Ther Adv Urol. 2017 Oct 31;10(1):3-10. doi: 10.1177/1756287217732660. eCollection 2018 Jan.