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Why there is 2 copy numbers for same patients for the same gene?

I have the CNV downloaded from TCGA2STAT in R, for BRCA patients. The data looks as follows:

gene    TCGA-3C-AAAU    TCGA-3C-AAAU
A1BG    0.1302  0.0064
A2M     0.2586  0.0033
A2MP1   0.2586  0.0033
NAT1    0.2662  0.0034

The same patient has 2 different CNV values for the same gene, why?

cnv
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updated by Emily Emily • written by mms140130 mms140130

1 answer

Probably because they have two copies of every gene (unless they're male, then they have two copies of most genes and one copy each of X and Y chromosome genes).

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written by Emily Emily

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