Many links between glutamines -- glutamate -- in cancer.

This is one small example.

For technical reference:

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Xenotropic murine leukemia virus-related virus

From Wikipedia, the free encyclopedia
 

Xenotropic murine leukemia virus-related virus (XMRV) is a retrovirus which was first described in 2006 as an apparently novel human pathogen found in tissue samples from men with prostate cancer

The cancer-associated "R462Q" mutation results in a glutamine instead of an arginine at position 462 of the RNase L enzyme, reducing its catalytic activity. A man with two copies of this mutation has twice the risk of prostate cancer; one copy raises the risk by 50%.