Abstract
ObjectivesAdvanced stage is linked to prolonged patient and diagnostic interval for gastrointestinal (GI) cancers. However, objective evidence of this fact is not so forthcoming. Our aim was to study the effect of these intervals on the risk of advanced stage for GI cancers. MethodsWe performed this retrospective cohort study to analyse the effect of patient and diagnostic intervals on final stage in seven types of GI cancers, during 2013 and 2022. Two groups of stage: early (TNM- 0, I, II) and advanced (TNM- III, IV), were formed. Outcome studied was interdependence between patient and diagnostic intervals and incidence of advanced stage. Binary logistic regression was applied to calculate odds ratio of having an advanced versus early stage as a function of duration of these delays, in the whole cohort.We used restricted cubic splines with five knots to study flexible and non-monotonic pattern of association between these delays and stage. ResultsIn whole cohort of 1859 patients, median patient and diagnostic intervals of early and advanced cancers were 21 and 26 days and 120 and 45 days, respectively. There was a positive association between patient interval and advanced stage (odds ratio [OR], 1.04, confidence interval [CI], 1.035 to 1.045; P < 0.001) and negative association between diagnostic interval and advanced stage (odds ratio, 0.98, CI, 0.976 to 0.998; P-0.017), among all gastrointestinal cancers combined. Increased risk of advanced stage started from day one of patient interval and for diagnostic interval there was an initial decrease followed by subsequent increase in the risk of advanced stage beyond 26 days of diagnostic interval. ConclusionsLonger patient and diagnostic intervals increase the risk of advanced stage in gastrointestinal cancers.
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