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Thanks very interesting post.
There is lots on olive oil on this site, but nothing I have seen linking it to HER.
There are links between fats and HER direct and indirect.
LIke most foods olive oil is a complex of lots of substances, and the possible impact of some these is covered in previous posts.
If the body is short of one fat it will use the next "best" available substitute which in those low in three and high in six or trans will be six or trans as that is all that is availabe.
It is possible by upping olive oil the body is using omega nine instead of sixes, which may help dmapen down inflamatory process.
Most of what I read is the the prime directive is to balance omega threes and sixes, with SMALL (teaspoons) amounts of other fats.
Olive is good (cold pressed virgin) becasue it is a fat that can be used for cooking IF required that is low in six, provides nines and has other useful chemicals that appear to mediate BC.
For me it is unsurprising that HER and or herceptin reaction action is moderated by fats. I have posted on several time as asking if one impact of Herceptin on FAS fatty acid sythasase could be blocking production of longer chain fats (Arachnidonic acid part of the inflamatory pathway) but also adding to the problems by blocking produstion of other long chain fats eg DHA. DHA shortages produce - fatigue, joint problems, brain issues, eyesight etc. It is no more than an uneducated guess as I have no been able to find the bits that would link possible bits of the jigsaw.
If fish were represented by a marketing organisation for a huge industry I suspect we would see similar trials for fish fish oil etc.
Adding to ones DHA consumption (fish oil) and reducing omega six for me is a wothwhile risk reduction category worthy of consideration (which includes usage of small quanities (teaspoons not mugs) of quality olive oil for salads etc).
Thank you for posting that - more to look up.
RB
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