Fig. 3From: Pathologically confirmed spontaneous regression of small cell lung cancer after computed tomography-guided percutaneous transthoracic needle biopsy followed by surgeryPathological findings of the resected specimens (HE stain, high-power field). Pathological examination showed a tiny lung cancer lesion (0.05 × 0.02 cm). Due to its size, immunohistochemical staining was impossibleBack to article page