Immunopositivity for Siglec-15 in gastric cancer and its association with clinical and pathological parameters
Michael Williams Leal Quirino, Michelly Cristiny Pereira, Maria de Fátima Deodato de Souza, Ivan da Rocha Pitta, Antônio Felix da Silva Filho, Mário Sérgio de Souza Albuquerque, Amanda Pinheiro de Barros Albuquerque, Mário Rino Martins, Maíra Galdino da Rocha Pitta, Moacyr Jesus Barreto de Melo Rêgo
Abstract
The sialic acid-binding immunoglobulin-type lectin Siglec-15 is a promising target to cancer immunotherapy in several tumor types. The present study aimed to investigate Siglec-15 expression in gastric cancer (GC) patient tissue and to evaluate its clinical value. Siglec-15 expression was evaluated by immunohistochemistry with 71 patients. Siglec-15 staining was observed in tumor cells of 53 (74.64%) patients, with significant association with histologic classification and angiolymphatic invasion (p<0.05). Immunohistochemistry analysis also detected Siglec-15 in tumor-associated stroma cells (macrophages/myeloid cells). There was no significant association with outcomes parameters. Siglec-15 expression in well differentiated histological GC tissues and in the tumor microenvironment are potential targets to be further investigated as a novel prognostic factor for GC.