APP and neuroblastoma: In this study, human neuroblastoma SH‐SY5Y cells stably transfected with either the wild‐type amyloid precursor protein gene (APPwt) or the 717 valine‐to‐glycine AβPP‐mutated gene (APPmut) were treated with 5‐(4ʹ‐hydroxyphenyl)‐γ‐valerolactone, 5‐(3ʹ,4ʹ‐dihydroxyphenyl)‐γ‐valerolactone, and the conjugated form 5‐(3ʹ‐dihydroxyphenyl)‐γ‐valerolactone‐4ʹ‐sulfate.