Pathological complete response to neoadjuvant alectinib in unresectable anaplastic lymphoma kinase positive non-small cell lung cancer: A case report

Figure 2 hematoxylin-eosin stained sections of tumor tissue at baseline and 14 mo later. A: Hematoxylin-eosin staining (200×) results of lung puncture biopsy confirming lung adenocarcinoma; B: HE staining (200×) results showing interstitial vascular and fibrous tissue hyperplasia, eosinophil infiltration, and chronic inflammation of the lung tissue. The arrows point to activated eosinophils.