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. 2017 Jun 6;116(12):1652-1659.
doi: 10.1038/bjc.2017.139. Epub 2017 May 18.

Statin use, candidate mevalonate pathway biomarkers, and colon cancer survival in a population-based cohort study

Affiliations

Statin use, candidate mevalonate pathway biomarkers, and colon cancer survival in a population-based cohort study

Ronan T Gray et al. Br J Cancer. .

Abstract

Background: Statin use after colorectal cancer diagnosis may improve survival but evidence from observational studies is conflicting. The anti-cancer effect of statins may be restricted to certain molecular subgroups. In this population-based cohort study, the interaction between p53 and 3-hydroxy-3-methylglutaryl coenzyme-A reductase (HMGCR) expression, KRAS mutations, and the association between statin use and colon cancer survival was assessed.

Methods: The cohort consisted of 740 stage II and III colon cancer patients diagnosed between 2004 and 2008. Statin use was determined through clinical note review. Tissue blocks were retrieved to determine immunohistochemical expression of p53 and HMGCR in tissue microarrays and the presence of KRAS mutations in extracted DNA. Cox proportional hazards models were used to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for colorectal cancer-specific and overall survival.

Results: Statin use was not associated with improved cancer-specific survival in this cohort (HR=0.91, 95% CI 0.64-1.28). Statin use was also not associated with improved survival when the analyses were stratified by tumour p53 (wild-type HR=1.31, 95% CI 0.67-2.56 vs aberrant HR=0.80, 95% CI 0.52-1.24), HMGCR (HMGCR-high HR=0.69, 95% CI 0.40-1.18 vs HMGCR-low HR=1.10, 95% CI 0.66-1.84), and KRAS (wild-type HR=0.73, 95% CI 0.44-1.19 vs mutant HR=1.21, 95% CI 0.70-2.21) status.

Conclusions: Statin use was not associated with improved survival either independently or when stratified by potential mevalonate pathway biomarkers in this population-based cohort of colon cancer patients.

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Conflict of interest statement

PWH is the Founder and Director in PathXL Ltd. MS-T is a senior advisor to PathXL. All other authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Selection of stage II and III colon cancer (adenocarcinoma) patients and samples. ICD=International Classification of Disease; NIB=Northern Ireland Biobank.
Figure 2
Figure 2
p53 immunohistochemistry in colon cancer tissue microarrays and associated markup for digital immunoscoring using QuPath image analysis software. Detected cells are colour-coded according to their classification: green=non-tumour; blue=negatively staining tumour; yellow=weakly staining tumour; orange=moderately staining tumour; red=strongly staining tumour. (A) Original core from a tumour demonstrating aberrant negative p53 immunostaining. (B) Original core from a tumour deomonstrating non-extreme (normal) p53 immunostaining. (C) Original core from a tumour demonstrating aberrant positive p53 immunostaining. (D) QuPath cellular markup in the aberrant negative p53 core. (E) QuPath cellular markup in the non-extreme (normal) p53 core. (F) QuPath cellular markup in the aberrant positive p53 core.

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