CYP2B6 and cancer: Only few experimental papers describing and comparing the expression and/or activity of crucial for cancer cell enzymes and factors have been published so far, e.g. in a panel of cancer cell lines activity of P450 enzyme was described by Yu et al. [1], microRNA expression profiles were presented by Blower et al. [2], global microRNA analysis was performed by Solkilde et al. [3], while expression of nuclear receptors was described by Holbeck et al. [4].