follicular lymphoma has to do with gene regulation correct specifically the bcl-2 gene. Which I believe clinical trials have shown cannabinoids specifically CBD can down regulate resulting in apotosis of the cancerous cells. I wrote a paper on cannabinoids and cancer last semester and can get the sources if you'd like? I have and currently treat cancer patients with cannabinoids so I have some experience in this just not specifically follicular lymphoma.
I would recommend a strain we have called "the wife" 18% CBD 1% THC we also have a cut of Big Oil (wife x Z7) at kind love that is testing at 18% CBD .5% THC. These would be crucial for you. We will have cuts of the wife at 420 cannabis cup for free and soon at the shop in central city, CO for like $10. Big Oil seeds will be available for retail purchase in 3 months. I would try to get tested cuts though.
I'm not sure where you are located but if you can get to CO or have friends here you could probably help your friend.
PM me if you wanna talk more