RT Journal Article SR Electronic T1 Fibrosis or Necrosis in Resected Lymph Node Indicate Metastasis Before Chemoradiotherapy in Lung Cancer Patients JF Anticancer Research JO Anticancer Res FD International Institute of Anticancer Research SP 4419 OP 4423 DO 10.21873/anticanres.14447 VO 40 IS 8 A1 YUTA TAKAHASHI A1 JUNICHI SOH A1 KAZUHIKO SHIEN A1 HIROMASA YAMAMOTO A1 MASAOMI YAMANE A1 KATSUYUKI KIURA A1 SUSUMU KANAZAWA A1 HIROYUKI YANAI A1 SHINICHI TOYOOKA YR 2020 UL http://ar.iiarjournals.org/content/40/8/4419.abstract AB Background/Aim: The histological features of lymph nodes (LNs) treated by chemoradiotherapy (CRT) in non-small cell lung cancer (NSCLC) have not been well studied. The purpose of this study was to evaluate the histological findings of LNs affected by CRT. Patients and Methods: Among 107 clinically N2 NSCLC patients who underwent induction CRT followed by surgery from 1999 to 2017, 24 patients who received pathological evaluation of mediastinal LN before CRT were enrolled in this study. Postoperatively, we histologically reviewed all resected LNs (n=117) of the station evaluated before CRT. Results: Fibrosis and/or necrosis were observed in all investigated LN stations. Histological observation of fibrosis and/or necrosis in the resected LNs after CRT indicated the presence of LN metastasis before CRT. Conclusion: The metastatic LNs that responded to CRT showed specific histological features, which enabled us to know the accurate clinical stage of the patient even though cancer cells were not found in the post-treated LNs.