Loss of PIK3CA Allows &lt;i&gt;In Vitro&lt;/i&gt; Growth but Not &lt;i&gt;In Vivo&lt;/i&gt; Progression of KRAS Mutant Lung Adenocarcinoma in a Syngeneic Orthotopic Implantation Model. This evidence concerns the gene KRAS and lung adenocarcinoma.