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Association of diabetes and breast cancer characteristics at diagnosis

Cancer Causes and Control, ISSN: 1573-7225, Vol: 34, Issue: 2, Page: 103-111
2023
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Article Description

Purpose: This study aims to examine the association of diabetes and breast cancer characteristics at diagnosis in Aotearoa/New Zealand. Methods: Patients diagnosed with invasive breast cancer between 2005 and 2020 were identified from the National Breast Cancer Register. Logistic regression modeling was used to estimate the adjusted odds ratio (OR) of having stage III–IV cancer and the OR of having stage IV cancer for women with diabetes compared to those without diabetes. The adjusted OR of having screen-detected breast cancers for patients aged 45–69 years with diabetes compared to patients without diabetes was estimated. Results: 26,968 women were diagnosed with breast cancer, with 3,137 (11.6%) patients having diabetes at the time of cancer diagnosis. The probability of co-occurrence of diabetes and breast cancer increased with time. Māori, Pacific and Asian women were more likely to have diabetes than European/Others. The probability of having diabetes also increased with age. For patients with diabetes, the probability of being diagnosed with stage III–IV cancer and stage IV cancer was higher than for patients without diabetes (OR 1.14, 95% CI 1.03–1.27; and 1.17, 95% CI 1.00–1.38). Women aged 45–69 years with diabetes were more likely to have screen-detected cancer than those without diabetes (OR 1.13, 95% CI 1.02–1.26). Conclusions: The co-occurrence of diabetes and breast cancer is becoming more common. Overall there is a small but significant adverse impact of having advanced disease for women with diabetes that is found at the time of breast cancer diagnosis, and this may contribute to other inequities that occur in the treatment pathway that may impact on patient outcomes.

Bibliographic Details

Lao, Chunhuan; Gurney, Jason; Stanley, James; Krebs, Jeremy; Meredith, Ineke; Campbell, Ian; Teng, Andrea; Sika-Paotonu, Dianne; Koea, Jonathan; Lawrenson, Ross

Springer Science and Business Media LLC

Medicine; Biochemistry, Genetics and Molecular Biology

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