Rs351855(T,T) by all accounts a rare geno type .
From my research is pretty nasty one as antibiotic drug toxicity can cause type of febrile neutropenia and increase your risk of sepsis.
Example : Results: Candidate SNPs were selected and explored for association with febrile neutropenia and/or pathological complete response. TT genotype of 388C>T in FGFR4 (rs351855) had a tendency toward higher incidence of febrile neutropenia.
That is difference between DNA & Drug toxicity if its not cancer its sepsis
Based on your geno dna BUT where dose asprin FIT into this as a lot of cancer cemo drugs they say you cant take asprin BUT if you carry gene WHERE taking asprin help's what is one to do.
I guess thats why its so important to look at your DNA after all don't they check drugs for other drugs interactions.
So why not look at your DNA first