Impact of cancer diagnosis and treatment on glycaemic control among individuals with colorectal cancer using glucose-lowering drugs

Glycemic Control for Colorectal Cancer Survivors Compared to Those without Cancer in the Dutch Primary Care for Type 2 Diabetes: A Prospective Cohort Study

Simple Summary

A growing number of colorectal cancer survivors live with type 2 diabetes, as a result of improved cancer diagnosis and treatment. These patients might have worse glycemic control after their cancer diagnosis, which may increase the risk of cardiovascular diseases. This prospective cohort study evaluated the quality of glycemic control for colorectal cancer survivors, as compared to those without cancer in Dutch primary care for diabetes. During a 10-year follow-up for 57,330 patients, there were 705 patients diagnosed with colorectal cancer. No clinically relevant difference on the probability of reaching the target HbA1c was observed between colorectal cancer survivors and patients with no history of cancer. These results showed a robust diabetes care system, implying that the glycemic control for colorectal cancer survivors can be delegated to the primary care professionals.

Abstract

Cancer survivors with diabetes tend to have worse glycemic control after their cancer diagnosis, which may increase the risk of cardiovascular diseases. We aimed to investigate whether glycemic control differs between colorectal cancer (CRC) survivors and those without cancer, among patients with type 2 diabetes being treated in the Dutch primary care. The Zwolle Outpatient Diabetes project Integrating Available Care database was linked with the Dutch Cancer Registry (n = 71,648, 1998–2014). The cases were those with stage 0–III CRC, and the controls were those without cancer history. The primary and secondary outcomes were the probability of reaching the glycated hemoglobin (HbA1c) target and the mean of HbA1c during follow-up, respectively. Mixed linear modeling was applied, where the status of CRC was a time-varying variable. Among the 57,330 patients included, 705 developed CRC during follow-up. The mean probability of reaching the HbA1c target during follow-up was 73% versus 74% (p = 0.157) for CRC survivors versus those without cancer, respectively. The mean HbA1c was 51.1 versus 50.8 mmol/mol (p = 0.045) among CRC survivors versus those without cancer, respectively. We observed a clinically comparable glycemic control among the CRC survivors without cancer, indicating that glycemic control for CRC survivors can be delegated to primary care professionals.

Does the hospitalization after a cancer diagnosis modify adherence to process indicators of diabetes care quality?

AIMS

This study was designed to answer the question whether surgery due to newly diagnosed cancer may modify quality of diabetes' management, as suggested by current guidelines.

METHODS

Adherence to guideline composite indicator (GCI), a process indicator including one annual assessment of HbA1c and at least two among eye examination, serum lipids measurement and microalbuminuria, was evaluated between years 2011-2012 and 2014-2015 in 158,069 diabetic patients living in Tuscany, Italy, on 1 January 2011 and surviving on 31 December 2015, of whom 661 were hospitalized in index year 2013 for a surgery procedure due to a newly incident cancer. Difference in GCI modification (DELTA_GCI) of these patients was compared with that of diabetic people without cancer, strictly matched for main confounders by means of a propensity score.

RESULTS

In diabetic patients with cancer, GCI adherence increased by about 8 % between years 2011-2012 and 2014-2015. When compared with controls, DELTA_GCI increased by 6 % in cancer group compared with controls (p < 0.05), but any significance was lost after matching the groups by propensity score (3 %; p = NS).

CONCLUSIONS

Our study suggests that a hospitalization for a surgical procedure due to a newly diagnosed cancer does not influence the compliance to a quality process indicator of diabetes care such as GCI.