Eligibility: Identical and non-identical female twin pairs, aged 18 years and above, in which one twin or both twins has had breast cancer.

This study could benefit all women by clarifying the genetic and environmental risks of developing breast cancer. It aims to:

  • answer questions around why only one twin in a pair with a similar familial background develops breast cancer;
  • identify environmental factors that are protective against breast cancer that could support the establishment of effective preventive strategies worldwide.

This international research project is being conducted collaboratively at the University of Melbourne by Professor John Hopper and the University of Southern California by Professor Thomas Mack and their associated colleagues. 

What is involved?

If you agree to participate in our study, we will:

  1. Send you an online questionnaire about your health and lifestyle containing a series of health-related questions about you and your twin. This should take about 30-45 minutes to complete. Participation is voluntary.
  2. Study participants may be contacted again in the future regarding possible collections of digital mammograms and blood or saliva samples. Again, participation is voluntary.

Who is eligible?

This study is open to identical and non-identical female twin pairs aged 18 years and above in which one twin or both twins has had breast cancer. Twins need to be members of Twins Research Australia; TRA membership is open to twins who both are either Australian citizens or who have permanent residency. 

Would you like to get involved?

If you would like to participate or find out more please This email address is being protected from spambots. You need JavaScript enabled to view it..

If you are not yet a Twins Research Australia member you will also need to register online here.


August-November 2020.


Twins Research Australia

Address: 3/207 Bouverie St
Carlton, Vic 3010

Freecall: 1800 037 021

Email: info@twins.org.au

ABN: 84 002 705 224

Twins Research Australia is a national resource supported by a Centre of Research Excellence Grant from the National Health and Medical Research Council and housed within the University of Melbourne.

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