My husband was treated with cisplatin and 5FU. He's 9 weeks post treatment. His Pet scan is clean but we are noticing short term memory loss. Just finished crawling the web for info. There was a study published just this April linking 5FU specifically to "chemo brain" or "chemo fog". They say the side effects get worse over time. So, I'm left asking why our doc chose this regimen over the multitude of other chemo cocktails. My suggestion to anyone being told they will be given 5FU is to ask questions...why 5FU, is there an alternative....better yet, get a second opinion.