Abstract
Introduction. Recent decades have witnessed a decline in mortality rates from malignant neoplasms (MN). However, cancer patients face a substantially elevated risk of death from non-cancer causes compared to the general population.
Aim. To evaluate non-cancer mortality patterns among patients with the 12 most prevalent MNs using data from the population-based cancer registry of the Arkhangelsk Region and Nenets Autonomous Okrug (PBR AO and NAO), and to quantify the relative risk of non-cancer mortality in cancer patients versus the general population.
Materials and Methods. We analyzed data on patients with 12 invasive MNs diagnosed between 2008–2023 from the PBR AO and NAO database. Mortality patterns were assessed for: index malignant neoplasms (iMNs), non-index MNs, and non-oncologic causes. Age-standardized mortality ratios (SMRs) were calculated for cardiovascular (CVD) and respiratory diseases (RD) in cancer patients relative to population controls.
Results. A total of 51,076 cancer cases were analyzed. The proportion of non-cancer deaths increased significantly from 8.9–33.2% (2008–2009) to 4.5–47.2% (2022–2023). During the COVID-19 pandemic, non-cancer mortality rose substantially across cancer types (lung cancer: 16.6%; prostate cancer: 58.0%), with RD deaths peaking at 26.7%. SMR analyses revealed markedly elevated risks: CVD mortality increased across all MNs, most notably for oral cavity (SMR 10.0, 95% CI 6.2–15.3) and cervical cancers (SMR 12.8, 95% CI 8.5–18.3) in 2022–2023. RD mortality risk exceeded population levels by 45-105 times during the pandemic.
Conclusion. Non-cancer causes constitute an increasingly significant component of overall mortality in cancer patients. The relative risk of CVD- and RD-associated mortality in this population substantially exceeds that of the general population.
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