Colorectal cancer: an atlas maps differences associated with age
· BehindLines newsroom
Colorectal tumours in younger people show differences in their cellular make-up and in the activity of certain genes. A study published in Nature Medicine on 29 October maps these features, without establishing that they alone explain more aggressive disease.
Comparing tumours across the age continuum
The researchers analysed 189 tumours: 54 from people diagnosed before age 50 and 135 from people diagnosed at or above that age. They examined gene activity in cell nuclei using preserved tissue.
The analysis goes beyond a comparison between two groups. It also examines gradual changes with age. Several comparisons account for tumour location, stage, sex and previous treatments.
Among tumours described as microsatellite stable, those from younger patients contain proportionally more supporting cells and fewer epithelial cells. The scientific abstract reports confirmation of this pattern through multispectral immunofluorescence and computational analysis in an external set of 712 tumours of the same subtype, including 18 diagnosed before age 50 and 694 at or above that age.
Other differences involve long non-coding RNAs, which do not directly serve to make proteins, and certain interactions between cells. Their precise role needs further investigation.
A research resource, without a demonstrated new treatment
According to Mass General Brigham, the measurements cover more than 850,000 tumour cells and other cells present in the samples. This figure describes the number of cells studied, rather than the number of people included.
The institution's account highlights a limitation: the method collected relatively few immune cells. It therefore cannot answer every question about immune responses at different ages.
The observed associations offer leads for studying disease mechanisms. They do not prove a cause of rising diagnoses among young adults and do not demonstrate the effectiveness of a drug.
This map is primarily intended to help researchers formulate and then test hypotheses. The possibilities for prevention, diagnosis or treatment mentioned by the teams remain research goals.