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2025 ; 17
(1
): 113
Nephropedia Template TP
gab.com Text
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English Wikipedia
Methylation-based smoking signatures in blood and tissue samples for the
prediction of self-reported smoking status and mortality in patients with
colorectal cancer
#MMPMID40611182
Yuan T
; Tagscherer KE
; Roth W
; Bewerunge-Hudler M
; Brobeil A
; Kloor M
; Bläker H
; Brenner H
; Hoffmeister M
Clin Epigenetics
2025[Jul]; 17
(1
): 113
PMID40611182
show ga
BACKGROUND: Smoking is a well-established risk factor for colorectal cancer (CRC)
development. However, the reliability of DNA methylation-based smoking signatures
in predicting smoking status and their prognostic value in CRC remain unclear,
particularly across different biological sample types. RESULTS: Five previously
validated methylation-based smoking signatures were analyzed in 2237 CRC patients
with blood-derived DNA and 2273 patients with tumor tissue-derived DNA.
Blood-derived signatures showed strong correlations with self-reported smoking
status, effectively differentiating current smokers from never smokers (all
p?0.0001), with excellent discriminative ability (median area under the
receiver operating characteristic curve: 0.94). In contrast, tumor tissue-derived
signatures exhibited much weaker associations with smoking status. Among
non-metastatic CRC patients, blood-derived methylation signatures were
significantly associated with increased risks of all-cause and non-CRC-related
mortality, but not with CRC-specific mortality. Conversely, two tumor
tissue-derived signatures demonstrated stronger associations with CRC-specific
mortality compared to blood-derived signatures. CONCLUSIONS: Blood-derived
methylation-based smoking signatures are robust indicators for smoking exposure
and are associated with increased mortality risk among non-metastatic CRC
patients. When applied to tumor tissue, signatures showed stronger associations
with CRC-specific mortality.