Page URL: https://www.bionews.org.uk/page_138041

First genomics study of African women may help fight breast cancer

28 August 2018
Appeared in BioNews 964

Genome sequencing technology has been used to shed light on the genetic causes of breast cancer in African woman and develop a model to predict breast cancer risk.

'This is the first study to use high-throughput genomic analysis of African women,' said study lead author, Dr Olufunmilayo Olopade, director of the Centre for Clinical Cancer Genetics at the University of Chicago in Illinois.

Women of African descent are more likely to develop and die from triple negative breast cancer than women of other heritages and are, on average, more than 10 years younger than American women of other ancestries when diagnosed.

'An urgent need exists to address widening global disparities in breast cancer mortality that disproportionately affect women of African ancestry,' write the authors in the Journal of Clinical Oncology.

The international study took place over more than 20 years as part of the Nigerian Breast Cancer Study based in Ibadan, southwest Nigeria. During this time, breast cancer incidences have steadily increased throughout the region.

Some 1136 women with breast cancer took part in the study along with 997 women of similar ages and heritage who did not have the condition. The researchers sequenced 25 genes associated with higher risks of breast cancer and identified the mutations occurring in each of those genes.

Out of the 1136 patients, 167 carried an inherited mutation in one of four common breast cancer-related genes, BRCA1, BRCA2, PALB2 and TP53.

'Based on state-of-the-art genomic technologies, two things were clear,' said study co-author Dr Mary-Claire King at the University of Washington in Seattle. 'Risks to Nigerian women who carry mutations in breast cancer genes are higher than risks to women in the US with mutations in the same genes. And inherited breast cancer plays a bigger role in the total occurrence of breast cancer in Nigeria compared to the US.'

As a result of the research, the international team has developed a model to help predict women at high risk of breast cancer in Sub-Saharan African women. This can be used to offer surveillance and interventions for women with a predisposition to breast cancer and could substantially reduce deaths from the condition. This is particularly important because the study also showed that breast cancer is diagnosed much later than in the US  86 percent of patients in the study were diagnosed with advanced stage three or four breast cancer.

'Lessons learned in Nigeria can be transferred back to low resource settings in the US and other countries,' added study co-author Professor Adeyinka Falusi at the University of Ibadan.

SOURCES & REFERENCES
Gene testing of Nigerian women could help prevent breast cancer
University of Washington Medicine |  21 August 2018
Genome Analysis of DNA from Nigerian Women Leads to 1st African Breast Cancer Risk Prediction Model
Breast Cancer News |  23 August 2018
Inherited Breast Cancer in Nigerian Women
Journal of Clinical Oncology |  21 August 2018
Researchers identify genes responsible for inherited breast cancer in Nigerian women
News-Medical.net |  22 August 2018
Sequencing genomes of Nigerian women could help prevent many lethal breast cancers
University of Chicago |  21 August 2018
RELATED ARTICLES FROM THE BIONEWS ARCHIVE
4 November 2019 - by Rikita Patel 
New genetic variants found in an African population provide insights into human health, according to a large genome study...
3 September 2018 - by Isobel Steer 
Finnish researchers have identified two possible mutations in one gene that are both correlated with prostate cancer...
13 August 2018 - by Jen Willows 
A study has identified five genes that are associated with an aggressive form of breast cancer...
12 February 2018 - by Dr Nicoletta Charolidi 
Blocking a single molecule, the amino acid asparagine, can prevent breast cancer spread in mice, according to a new study...
5 October 2015 - by Dr Rosie Gilchrist 
An international team of scientists from the 1000 Genomes Project Consortium has created the world's largest catalogue of genomic differences among humans...
8 June 2009 - by Rosie Beauchamp 
A study published this week in Science has kick-started discussions surrounding research into the genetic diversity of African populations and the necessity for Africa to keep up with genomics....
HAVE YOUR SAY
Log in to add a Comment.

By posting a comment you agree to abide by the BioNews terms and conditions


Syndicate this story - click here to enquire about using this story.