Impact of COVID-19 on Emergency Colorectal Cancer Presentations in Regional Australia

Emergency colorectal cancer presentations remained stable within a regional Australian health service during the COVID-19 pandemic restrictions, according to a retrospective cohort study published in Cureus. Despite widespread disruptions to screening programs and diagnostic services between January 2020 and July 2022, absolute emergency presentation volumes and their proportion relative to elective surgeries did not increase significantly compared to pre-pandemic baselines.

Regional Emergency Presentation Volumes Remained Stable During Pandemic Restrictions

The Cureus study evaluated 149 patients who presented emergently with newly diagnosed colorectal cancer between January 2019 and July 2023. Absolute emergency presentation volumes held steady across the complete calendar years studied, recording 30 cases in 2019, 28 in 2020, 32 in 2021, and 30 in 2022.

Emergency presentations also remained stable relative to elective colorectal cancer resections, accounting for 15.3% of surgical activity in 2019 compared with 15.2% during the restriction period spanning 2020 to 2022. The odds ratio for this comparison was 0.99 with a 95% confidence interval of 0.63 to 1.55, yielding a p-value of 0.970.

Increasing Tumor Grade and Stoma Formation Rates Recorded in Later Years

While overall presentation frequency did not rise during the restrictions, the Cureus research team identified temporal shifts in tumor characteristics and management complexity. Increasing calendar year was independently associated with greater odds of high-grade disease, showing an adjusted odds ratio of 1.39 per year. Stoma formation at index presentation similarly increased over the study period, with an adjusted odds ratio of 1.37 per year.

However, researchers noted that the association with stoma formation was heavily influenced by a marked increase in 2022 and should be interpreted cautiously. Stage IV and metastatic disease occurred more frequently in later years, though these temporal associations did not reach statistical significance.

Contrasting Findings From United Kingdom Tertiary Care Research

Contrasting with the stable regional Australian emergency volumes, a separate single-centre retrospective cohort study published on the National Center for Biotechnology Information (NCBI) database reported a significant increase in emergency presentations during the 2020 lockdown in the United Kingdom. That study, conducted at a tertiary referral centre, examined 272 patients diagnosed with colorectal adenocarcinoma in 2020 against 282 patients in 2019 and 257 in 2018.

The NCBI-hosted study documented a significant decrease in urgent suspected cancer referrals, diagnostic colonoscopies, and radiological imaging between March and June 2020. This diagnostic curtailment coincided with a statistically significant rise in emergency presentations and increased rates of large bowel obstruction during 2020 compared to the 2018–2019 baseline. The UK cohort saw more T4 cancers diagnosed in 2020 than in previous years, contrasting with the regional Australian findings where overall emergency presentation volumes did not spike despite reduced national screening activity.

Bowel Cancer Screening Procedures Dropped in Australia

Both studies operated against a backdrop of widespread healthcare interruptions. In Australia, the National Bowel Cancer Screening Program utilizes an immunochemical faecal occult blood test for eligible adults aged 50 to 74 years. National data cited in the Cureus study showed that colonoscopy and sigmoidoscopy activity dropped by approximately 15% between January and September 2020 compared to 2019, resulting in more than 78,000 fewer procedures nationwide.

In the United Kingdom, nationwide lockdown measures led to the temporary suspension of non-urgent care, an estimated cancellation of 30,000 cancer operations, and a 25% drop in urgent cancer referrals, according to the NCBI-hosted study. Professional bodies subsequently adjusted rapid-access referral pathways to manage diagnostic backlogs while mitigating infection risks during aerosol-generating procedures.

Healthcare Disruptions Affect Tumor Aggressiveness and Diagnostic Pathways

The Cureus findings indicate that monitoring presentation frequency alone may fail to capture underlying changes in tumor aggressiveness and management complexity following public health disruptions. Authors of the regional Australian study emphasized that understanding these downstream effects remains critical for preserving cancer diagnostic pathways during future periods of healthcare strain.

Similarly, researchers from the UK tertiary study concluded that short-term adjustments to referral pathways carry significant consequences, making it vital to build reliable cancer care systems that minimize future adverse events and maintain the benefits of timely diagnosis and treatment.