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https://www.med.cuhk.edu.hk/press-releases/cuhk-first-discovers-obese-patients-with-diabetes-and-fluctuating-blood-glucose-control-had-a-high-cancer-risk-while-patients-with-diabetes-treated-with-a-common-class-of-blood-pressure-lowering-drug-had-a-low-cancer-risk
https://www.med.cuhk.edu.hk/press-releases/cuhk-first-discovers-obese-patients-with-diabetes-and-fluctuating-blood-glucose-control-had-a-high-cancer-risk-while-patients-with-diabetes-treated-with-a-common-class-of-blood-pressure-lowering-drug-had-a-low-cancer-risk

CUHK first discovers obese patients with diabetes and fluctuating blood glucose control had a high cancer risk while patients with diabetes treated with a common class of blood pressure lowering drug had a low cancer risk

Researchers at The Chinese University of Hong Kong (CUHK)’s Faculty of Medicine (CU Medicine) have reported two major findings related to cancer risk in patients with diabetes using big data. They first discovered that overweight or obese patients with diabetes and marked fluctuation in blood glucose control had 50% increased risk of cancer while patients with diabetes treated with renin-angiotensin-system inhibitor (RASi), a common class of blood pressure lowering drug, had a 50% lower risk of cancer. Findings have been published in medical journals The Lancet Regional Health - Western Pacific and EBioMedicine.

 

Diabetes affected 537 million people worldwide in 2021. In Hong Kong, one in eight adults have diabetes with a rising trend in young people. Diabetes and obesity frequently coexist to markedly increase the risk of critical illnesses including heart disease, stroke, kidney failure and cancer. With declining death rate from stroke and heart disease together with ageing, cancer is now one of the leading causes of death in people with diabetes. In Hong Kong, one in four patients with diabetes dies of cancer.

 

Research team members include (from right) Professor Juliana Chan, Chair Professor of Medicine and Therapeutics at CU Medicine and Director of the Hong Kong Institute of Diabetes and Obesity; Dr Aimin Yang, Research Assistant Professor and Dr Elaine Chow, Assistant Professor in the Department of Medicine and Therapeutics at CU Medicine.

Researchers at CU Medicine have reported two major findings related to cancer risk in patients with diabetes using big data. They first discovered that overweight or obese patients with diabetes and marked fluctuation in blood glucose control had 50% increased risk of cancer while patients with diabetes treated with RASi, a common class of blood pressure lowering drug, had a 50% lower risk of cancer.  

 

Research team members include (from right) Professor Juliana Chan, Chair Professor of Medicine and Therapeutics at CU Medicine and Director of the Hong Kong Institute of Diabetes and Obesity; Dr Aimin Yang, Research Assistant Professor and Dr Elaine Chow, Assistant Professor in the Department of Medicine and Therapeutics at CU Medicine.  

“Patients with suboptimal control of diabetes, especially in the presence of obesity, have an abnormal internal environment including low grade inflammation which can promote cancer growth. This partly explains the 30% to 300% higher cancer risk in patients with diabetes than in those without diabetes, especially liver, colorectal, pancreas, breast, and uterus cancers.”, said Professor Juliana Chan, Chair Professor of Medicine and Therapeutics at CU Medicine and Director of the Hong Kong Institute of Diabetes and Obesity. 

 

The CUHK diabetes research team used real-world data from the Hong Kong Diabetes Register including 30,000 patients who were followed up at the Prince of Wales Hospital (1995-2019) and four million people who had ever had their blood glucose measured at public hospitals or clinics in the Hong Kong Diabetes Surveillance Database (HKDSD, 2000-2019) to discover emerging trends in diabetes and its complications in Hong Kong Chinese people.

 

Obese patients with diabetes and fluctuating blood glucose control have a 50% higher risk of any cancer than non-obese patients with steady blood glucose values

 

Glycated haemoglobin (HbA1c) is a percentage index of red blood cells in the body which are covered by glucose. For a normal range of blood glucose of 5-8 mmol/L, the corresponding HbA1c value is 5.0-6.5%. Since the oxygen-carrying red blood cells in the body are renewed every three months, HbA1c is used to measure the average blood glucose control during the same period.

 

In 15,286 patients diagnosed with diabetes at an average age of 50 observed in 1995-2019, after having diabetes for 20 years, 928 patients developed cancer led by colorectal (n=184), liver (n=117) and breast (n=77) cancer, with 349 of them died with cancer. These patients had an average of 17 HbA1c measurements with 2-3 values every year. Researchers counted the number of HbA1c values measured during the observation period which varied by 0.5% compared with the previous value and expressed them as a percentage of the total number of HbA1c counts to indicate the level of fluctuation in blood glucose control (HbA1c variability score, HVS).

 

Stratified by a median value of 47%, the average HVSs in the high HVS and low HVS groups were 58% and 25% respectively. Compared to the low HVS group, the high HVS group had a 15% higher risk of developing any cancer. Obese patients (BMI ≥25 kg/m2) with high HVS had a 50% higher risk of any cancer especially of the breast (244%) and liver (263%) compared with non-obese patients with low HVS. These patients also had a 35-45% higher risk of death due to cancer, vascular and other causes including infection and kidney disease. 

 

Lower risk of cancer in patients with diabetes treated with RASi a class of blood pressure lowering drug than non-users

 

In another analysis led by Dr Aimin Yang, Research Assistant Professor in the Department of Medicine and Therapeutics at CU Medicine, among 253,491 patients with type 2 diabetes, 5.9% were diagnosed with any cancer during 6.3 years of follow-up. They found that patients treated with RASi, a class of blood pressure lowering drug, had a lower risk of cancer than those not treated with RASi.

 

For the 47% new-RASi users, they had a 23% lower risk of any cancer and a 50% lower risk of cancer-related death than those not treated with RASi. Compared with non-users, amongst every 1000 RASi users, 2.6 all-site cancers, 6.3 all-cause deaths, and 2.2 cancer deaths were prevented every year. Compared with patients treated with another class of blood pressure lowering drugs, young patients treated with RASi also had a lower risk of cancer death.

 

Dr Elaine Chow, Assistant Professor in the Department of Medicine and Therapeutics at CU Medicine and senior author of the paper remarked, “High blood glucose, low grade inflammation and signals secreted from fat cells can activate angiotensin II (Ang II), a potent hormone which can increase blood pressure and stimulate cell growth. RASi reduces the activity of Ang II and has been confirmed to reduce the risk of heart disease, stroke and kidney failure in patients with diabetes. In the HKDSD, only 50% of patients were treated with this class of drug. Our novel data suggests that this drug class might lower cancer risk possibly by reducing the harmful effects of Ang II on cancer growth.”

 

These novel data emphasised the importance of good diabetes management with regular monitoring to avoid fluctuating blood glucose levels and obesity and as well as early use of organ-protective drugs such as RASi to reduce the risk of life-threatening events including cancer. This is particularly relevant to young people with diabetes, who face the prospect of suffering from the disease for a long time. 

 

Professor Juliana Chan concluded, “Diabetes is a silent killer. Since 1995, CU Medicine has been a world pioneer in transforming the delivery of diabetes care by gathering data systematically and using the data to stratify risk, empower self-management and personalise care. These latest results highlight the impact of using data to influence policies and practices, and save patients’ lives.”

 

The study was supported by a CUHK Impact Research Fellowship Scheme, and other funding support.

 

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Radiotherapy to Head and Neck Raises Risk for Stroke CUHK Proved Effectiveness of Carotid Angioplasty and Stenting

Research
CUHK Research Explains Why Patients with Cystic Fibrosis Often Develop Diabetes

CUHK Research Explains Why Patients with Cystic Fibrosis Often Develop Diabetes

Research
CUHK Research Shows 60% Diabetic Patients Have Poor Sleep Auriculotherapy Helps Improve Sleep Quality and Glycaemic Control

CUHK Research Shows 60% Diabetic Patients Have Poor Sleep Auriculotherapy Helps Improve Sleep Quality and Glycaemic Control

Research
CUHK Succeeded in Animal Study and Clinical Case of Percutaneous Nanoknife New Breakthrough in Cancer Treatment

CUHK Succeeded in Animal Study and Clinical Case of Percutaneous Nanoknife New Breakthrough in Cancer Treatment

Research
CUHK and PolyU Jointly Introduce TeleStroke for 24-hour Thrombolysis Service at Prince of Wales Hospital

CUHK and PolyU Jointly Introduce TeleStroke for 24-hour Thrombolysis Service at Prince of Wales Hospital

Clinical service
CUHK Releases Research Results on Employment Status of Hong Kong Chronic Kidney Disease (CKD) Dialysis Patients and Promotes Predialysis Education Programme for Mid to Late Stage CKD patients

CUHK Releases Research Results on Employment Status of Hong Kong Chronic Kidney Disease (CKD) Dialysis Patients and Promotes Predialysis Education Programme for Mid to Late Stage CKD patients

Research
CUHK Announces Latest Medical Treatment for Minor Stroke

CUHK Announces Latest Medical Treatment for Minor Stroke

Research
Hong Kong and Macau Among Top Three Regions in Asia-Pacific with the Highest Incidence of Inflammatory Bowel Disease CUHK Establishes Registry to Increase Public Awareness

Hong Kong and Macau Among Top Three Regions in Asia-Pacific with the Highest Incidence of Inflammatory Bowel Disease CUHK Establishes Registry to Increase Public Awareness

Research
CUHK-HCC Score Accurately Predicts Risk of Liver Cancer in Chronic Hepatitis B Patients Receiving Antiviral Therapy

CUHK-HCC Score Accurately Predicts Risk of Liver Cancer in Chronic Hepatitis B Patients Receiving Antiviral Therapy

Research
CUHK Pioneers the Use of 3D Echocardiography to Identify At-Risk Mitral Valve Prolapse Patients

CUHK Pioneers the Use of 3D Echocardiography to Identify At-Risk Mitral Valve Prolapse Patients

Research
CUHK Advocates Palliative Care for Advanced Dementia Patients with Swallowing Problems

CUHK Advocates Palliative Care for Advanced Dementia Patients with Swallowing Problems

Research
CUHK Discovers Innovative ‘Flow Diverters’ (Pipeline) as Effective Treatment for Cerebral Aneurysms in Asia’s First Clinical Study in Collaboration with Seven Medical Centres

CUHK Discovers Innovative ‘Flow Diverters’ (Pipeline) as Effective Treatment for Cerebral Aneurysms in Asia’s First Clinical Study in Collaboration with Seven Medical Centres

Research
CUHK and HKU Host the 5th Annual Palliative Care Symposium for Health Care Workers in Chinese Population

CUHK and HKU Host the 5th Annual Palliative Care Symposium for Health Care Workers in Chinese Population

Symposium
CUHK Pioneers Innovative Computer Assisted Tumor Surgery for Bone Cancer Patients

CUHK Pioneers Innovative Computer Assisted Tumor Surgery for Bone Cancer Patients

Surgical advancement
Bowel Cancer Will Become Top Cancer in Hong Kong CUHK Introduces Colon Pill Camera to Prevent Bowel Cancer

Bowel Cancer Will Become Top Cancer in Hong Kong CUHK Introduces Colon Pill Camera to Prevent Bowel Cancer

Surgical advancement
CUHK Develops an Automatic Retinal Image Analysis System to Help Diabetes Patients and Elderly Prevent Stroke

CUHK Develops an Automatic Retinal Image Analysis System to Help Diabetes Patients and Elderly Prevent Stroke

Research
CUHK Study Reveals High Salt Intake Will Lead to High Blood Pressure and Higher Risk of Stroke

CUHK Study Reveals High Salt Intake Will Lead to High Blood Pressure and Higher Risk of Stroke

Research
CUHK Launches Territory-wide Sleep Health Education Campaign to Promote Healthy Sleep and Healthy School Life

CUHK Launches Territory-wide Sleep Health Education Campaign to Promote Healthy Sleep and Healthy School Life

Health Campaign
CUHK and HKU's Collaborative Research Discovers Novel Epilepsy Genetic Markers

CUHK and HKU's Collaborative Research Discovers Novel Epilepsy Genetic Markers

Research
CUHK Advocates Early Detection of Chronic Kidney Diseases Joined by Leading Nephrologists to Make Sound Recommendations

CUHK Advocates Early Detection of Chronic Kidney Diseases Joined by Leading Nephrologists to Make Sound Recommendations

Research
The Chinese University of Hong Kong Nethersole School of Nursing hosts the Fifth Pan-Pacific Nursing Conference and Seventh Nursing Symposium on Cancer Care

The Chinese University of Hong Kong Nethersole School of Nursing hosts the Fifth Pan-Pacific Nursing Conference and Seventh Nursing Symposium on Cancer Care

Symposium
CUHK Proves the Potent Efficacy of Stenting for Carotid Artery Narrowing and Cardiac Contractility Modulation for Heart Failure

CUHK Proves the Potent Efficacy of Stenting for Carotid Artery Narrowing and Cardiac Contractility Modulation for Heart Failure

Research
Three CUHK Scholars Named Croucher Senior Research Fellow 2011-12

Three CUHK Scholars Named Croucher Senior Research Fellow 2011-12

Awards and honors
Predicting Your Colorectal-polyp Risk with CUHK Colorectal-polyp Prediction Index (CU-CPI)

Predicting Your Colorectal-polyp Risk with CUHK Colorectal-polyp Prediction Index (CU-CPI)

Clinical service
CUHK Research Findings on Severe Human Swine Flu in Hong Kong

CUHK Research Findings on Severe Human Swine Flu in Hong Kong

Research

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