FNTB and cancer: CpG Methylation of Protein Prenyltransferase Genes &lt;i&gt;FNTA&lt;/i&gt;, &lt;i&gt;FNTB&lt;/i&gt;, &lt;i&gt;PGGT1B&lt;/i&gt; and &lt;i&gt;RABGGTA&lt;/i&gt; in Cancer Cell Lines.