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Kloft, Maximilian; Ruisch, Jessica E; Raghuram, Gayatri; Emmerson, Jake; Nankivell, Matthew; Cunningham, David; Allum, William H; Langley, Ruth E; Grabsch, Heike I
Annals of surgery, 02/2023, Volume: 277, Issue: 2Journal Article
To analyze the relationship between negative lymph node (LNneg) size as a possible surrogate marker of the host antitumor immune response and overall survival (OS) in esophageal cancer (EC) patients. Lymph node (LN) status is a well-established prognostic factor in EC patients. An increased number of LNnegs is related to better survival in EC. Follicular hyperplasia in LNneg is associated with better survival in cancer-bearing mice and might explain increased LN size. The long axis of 304 LNnegs was measured in hematoxylin-eosin stained sections from resection specimens of 367 OE02 trial patients (188 treated with surgery alone (S), 179 with neoadjuvant chemotherapy plus surgery (C+S)) as a surrogate of LN size. The relationship between LNneg size, LNneg microarchitecture, clinicopathological variables, and OS was analyzed. Large LNneg size was related to lower pN category ( P = 0.01) and lower frequency of lymphatic invasion ( P = 0.02) in S patients only. Irrespective of treatment, (y)pN0 patients with large LNneg had the best OS. (y)pN1 patients had the poorest OS irrespective of LNneg size ( P < 0.001). Large LNneg contained less lymphocytes ( P = 0.02) and had a higher germinal centers/lymphocyte ratio ( P = 0.05). This is the first study to investigate LNneg size in EC patients randomized to neoadjuvant chemotherapy followed by surgery or surgery alone. Our pilot study suggests that LNneg size is a surrogate marker of the host antitumor immune response and a potentially clinically useful new prognostic biomarker for (y)pN0 EC patients. Future studies need to confirm our results and explore underlying biological mechanisms.
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