FGFR1 and squamous cell carcinoma: Acquisition of &lt;i&gt;FGFR1&lt;/i&gt; and &lt;i&gt;NSD3&lt;/i&gt; Amplifications During the Transformation of &lt;i&gt;EGFR&lt;/i&gt;-Mutated Lung Adenocarcinoma into Squamous Cell Carcinoma: A Case Report.