Trial to Evaluate the Impact of Various Interventions to Increase the Uptake of Surveillance Mammography in Eligible Women in Singapore

Pragmatic Randomized Trial to Evaluate the Impact of Various Interventions to Increase the Uptake of Surveillance Mammography in Eligible Women in Singapore

Breast cancer is the most common cancer among women in Singapore, with more than 70 women out of every 100,000 being diagnosed each year. Early detection through regular mammograms can significantly reduce deaths from breast cancer. Although Singapore has had a national breast cancer screening program (now part of the Screen for Life initiative) for over 20 years, and the government offers substantial subsidies to make screening more affordable, participation remains low at only 30-40%. This low uptake is due to factors like fear, lack of awareness, cultural beliefs, and a perceived low risk of breast cancer. To be effective on a large scale, at least 70% of women need to participate in regular mammography screenings. While researchers in Singapore and Asia have studied the reasons behind low screening rates, there is still a lack of large-scale studies that test different strategies to increase mammography participation in these regions.

This trial will recruit 12,000 women aged 50-69 who have not undergone a mammogram in the past two years. 9000 women will be randomized into five intervention arms. The interventions include: direct mail reminder (Arm 1, control, n=3000), financial incentive (Arm 2, n=1500), lottery incentive (Arm 3, n=1500), health messaging from an influential figure (Arm 4, n=1500), and personal health concierge for appointment scheduling (Arm 5, n=1500). Another 3000 women will be placed in a non-interventional arm (NI arm) for observational analysis, that receives no reminders at all. A post-intervention telephone survey will assess intervention effectiveness.

The primary outcome is mammogram uptake across intervention arms with Arm 1 as a reference. Secondary outcome will be to compare Arm 1 with NI arm. Subgroup analyses will evaluate differences in uptake by sociodemographic factors, such as ethnicity and socioeconomic status. A cost-effectiveness analysis will assess the financial viability of each intervention.

This is the first large-scale study in Singapore and Asia to compare multiple interventions to boost mammography uptake. Findings will provide evidence-based strategies to improve breast cancer screening participation, potentially reducing breast cancer mortality and informing future public health policy.

Study Overview

• Status: Enrolling by invitation
• Conditions: This Study Evaluates Interventions to Increase Surveillance Mammography Uptake for Early Breast Cancer Detection Among Singaporean Women
• Intervention / Treatment: Other: Only reminder mailer; Other: Financial intervention; Other: Lottery intervention; Other: Health Messages; Other: Personal Health Concierge

Detailed Description

This study aims to evaluate different interventions to boost breast cancer screening (mammography) participation among women in Singapore, aged 50-69, using data from the National University Health System (NUHS). 9000 eligible women will be randomized into one control arm and four experimental arms, receiving different combinations of reminders and incentives. Another 3000 women will be placed in an observational arm that receives no reminders at all. The study will use data from the NUHS electronic health records (EPIC) and NUHS app to monitor mammogram completion rates, exploring the effectiveness of each intervention.

Study Arms:

Control Group (Direct Mail Reminder): Receives a mail reminder with basic information about breast cancer and instructions on scheduling a mammogram.

Financial Incentive Group: Mail reminder + a $10 voucher for completing a mammogram within three months.

Lottery Incentive Group: Mail reminder + chance to win a $5000 lottery for completing the screening within three months.

Health Messaging Group: Mail reminder + QR code to a 60-second video from an influential person, available in four languages (English, Chinese, Malay, Tamil).

Personal Health Concierge Group: Mail reminder + a dedicated hotline for scheduling mammogram with the help of a health concierge over eight weeks.

Selection and Randomization:

Eligible participants will be selected from over 500,000 registered users of the OneNUHS app. Randomization will be done using a random number generator, with control and experimental arms receiving a 2:1 ratio. Data collected include basic demographic details and mammogram history, extracted securely from the EPIC system.

Data Collection:

Women in each arm will receive a physical mailer and three push notifications over three weeks, instructing them to schedule a mammogram at any approved screening center. Data on mammogram attendance will be extracted from EPIC post-study, and a subset of participants will be surveyed to gather feedback.

Primary and Secondary Endpoints:

The study will compare mammogram participation rates between the control and experimental arms, with secondary analyses exploring the uptake rates of arm 1 and NI arm as well as, impact of ethnicity, age, and income (via housing type) on outcomes. Additionally, a cost-effectiveness analysis will assess the impact of interventions on breast cancer detection and healthcare savings.

Follow-up and Evaluation:

A post-trial telephone survey of 750 participants will gather insights into their response to the interventions. The study aims to provide actionable insights into effective, scalable interventions to improve mammography uptake and reduce breast cancer mortality in Singapore.

• Study Type: Interventional
• Enrollment (Estimated): 12000
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Singapore
  • Singapore, Singapore
    • National University Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Singaporean citizen
• Age 50-69
• Registered as a patient at the National University Hospital
• Registered and active user of OneNUHS App
• Signed up with Healthier SG with a primary care provider within the NUHS Primary Care Network

Exclusion Criteria:

• Diagnosis of breast cancer in EPIC
• Mammogram done in the past 24 months in EPIC

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

6

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
No Intervention: Observational Arm; Does not receive any mailer reminder to go for mammogram.
Experimental: Arm 1 (control); Receives a mail reminder with basic information about breast cancer and instructions on scheduling a mammogram	Other: Only reminder mailer; Receives a mail reminder with basic information about breast cancer and instructions on scheduling a mammogram.
Experimental: Arm 2: Financial incentive; Receives mail reminder + a $10 voucher for completing a mammogram within three months.	Other: Financial intervention; Participants completing the mammogram within the study end date will receive a $10 voucher.
Experimental: Arm 3: Lottery incentive; Receives mail reminder + chance to win a $5000 lottery for completing the screening within three months.	Other: Lottery intervention; Participants completing the mammogram within the study end date will receive achance to win a $5000 lottery.
Experimental: Arm 4: Health messaging; Receives mail reminder + QR code to a 60-second video from an influential person, available in four languages (English, Chinese, Malay, Tamil).	Other: Health Messages; Participants will receive a less than 5 minute long video from an influential person. The video will be available in four languages (English, Chinese, Malay, Tamil).
Experimental: Arm 5: Personal Health Concierge; Receives mail reminder + a dedicated hotline for scheduling mammograms with the help of a health concierge over eight weeks.	Other: Personal Health Concierge; Participants will be able to call a dedicated hotline for scheduling mammograms with the help of a health concierge over eight weeks of receive the the mailer.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Comparison of Mammogram Uptake Between Intervention Arms (2-5) and Control Arm	Primary endpoint: Comparison of the proportion of women who undergo surveillance mammography among participants in Arms 2-5 versus Arm 1 (control arm).	3 month from study start or 4 months from randomization

Collaborators and Investigators

• Sponsor: National University Hospital, Singapore

Study record dates

Study Major Dates

• Study Start (Actual): September 16, 2024
• Primary Completion (Actual): December 31, 2024
• Study Completion (Estimated): December 31, 2025

Study Registration Dates

• First Submitted: December 10, 2024
• First Submitted That Met QC Criteria: December 10, 2024
• First Posted (Actual): December 13, 2024

Study Record Updates

• Last Update Posted (Actual): May 22, 2025
• Last Update Submitted That Met QC Criteria: May 19, 2025
• Last Verified: October 1, 2024

More Information

Terms related to this study

• Keywords: Mammography; Breast Neoplasms
• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Skin Diseases; Breast Diseases; Breast Neoplasms
• Other Study ID Numbers: 2023/01007

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No