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Age Gap Decision Tool

A tool designed to allow for the comparison of breast cancer treatments for older women. The treatments considered within this tool are surgery, primary endocrine therapy and chemotherapy. This tool is designed for use by clinicians with appropriate knowledge of breast cancer and the two types of treatment that are addressed here. Choose a comparison below to get started...

Compare Surgery and Primary Endocrine Therapy (PET)

Compare Surgery With & Without Chemotherapy

First Time Here?

Download our instructions for use to get started.

Decision Support Booklets

  • Surgery and Primary Endocrine Therapy
  • Surgery with and without Chemotherapy
CE Mark
The Age Gap Decision Tool is a software medical device that provides reference information to help a Healthcare Professional to use their knowledge to make a clinical decision.
  • The University of Sheffield
  • Cardiff University
  • Sheffield Hallam University
  • The National Institute for Health Research
  • Version 1.0
  • ©2025 The University of Sheffield
  • Built by epiGenesys

Please Note: The Age Gap on line tool uses a mathematic model based on information from many thousands of women over the age of 70 years diagnosed with early breast cancer between 2002 and 2012. Data was obtained using the UK cancer registration service. Outcomes are predicted based on the actual outcomes of these women. The model was developed on one set of data from the West Midlands and Northern and Yorkshire regions which has been subjected to peer review and published and has been validated on a second dataset to enhance accuracy and reliability. Despite this, as with any mathematical model, it may be inaccurate for an individual woman and can only provide an estimate of likely outcomes. The tool is designed to be used in consultation with an expert clinician and take into account a wide range of parameters and in collaboration with the patient and her preferences and opinions.