Tamoxifen alternative B17

Thank you ladies.  I have an aquantance who has been taking B17 for 5 years and swears by it.  I must say I am horrified by the effects of Tamoxifen so am really wanting to find an alternative.  My dad died of a blood clot to the lungs and my understanding from what I have read is that I have a 30% increased risk of the same thing happening on Tamoxifen not to mention the increased risks in liver and uterine cancers.  The World Health Organisation lists Tamoxifen as a human carcinogen and the Australian Nation Health and Medical Research Council warns that no amount of tamoxifen is safe when it comes to carcinogenic effects so hence, I am extremely hesitant to take this drug.   Are we going to find out in 30 years time that this drug caused more harm than good as we have with many drugs throughout history?  I am really wanting to seek out alternative natural treatments rather than put myself at more risk by taking this synthetic drug with so much risk attached to it.