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The expression of programed death ligand‐1 could be related with unfavorable prognosis in salivary duct carcinoma
Author(s) -
Sato Fumihiko,
Akiba Jun,
Kawahara Akihiko,
Naito Yoshiki,
Ono Takeharu,
Takase Yorihiko,
Murata Kazuya,
Abe Hideyuki,
Yamaguchi Tomohiko,
Miyoshi Hiroaki,
Abe Yushi,
Mihara Yutaro,
Tanikawa Masahiko,
Akashi Momoko,
Kurose Hirofumi,
Umeno Hirohito,
Yano Hirohisa
Publication year - 2018
Publication title -
journal of oral pathology and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 83
eISSN - 1600-0714
pISSN - 0904-2512
DOI - 10.1111/jop.12722
Subject(s) - stroma , immunohistochemistry , salivary duct carcinoma , pd l1 , pathology , medicine , carcinoma , salivary gland , immune system , cancer research , immunotherapy , immunology
Background Salivary duct carcinoma ( SDC ) is a rare tumor occurring in the salivary gland. SDC is a highly aggressive tumor and its prognosis is extremely poor. Effective treatments in advanced SDC have not yet been established. Recently, immune checkpoint inhibitors have paved the way for the treatment of various malignancies. We examined the expressions of programed death ligand ( PD ‐L) 1/ PD ‐L2 and programed death ( PD ‐1), and the correlation of clinicopathological findings. Methods We examined 18 cases of SDC and conducted immunohistochemical staining using formalin‐fixed paraffin‐embedded full‐face sections. Results The expression of PD ‐L1 and PD ‐L2 in tumor cells was observed in nine cases (50%) and 14 cases (78%), respectively. Cases with a high expression of PD ‐L1 and PD ‐L2 were found in four (22%) and seven cases (39%), respectively. The cases with a high expression of PD ‐L1 showed significantly shorter overall survival compared to those with low PD ‐L1 expression and null expression. We also examined the expression of PD ‐L1/ PD ‐L2 and PD ‐1 of tumor‐infiltrating mononuclear cells ( TIMC ) in stroma. The expressions of PD ‐L1 in tumor cells and stroma had a significant correlation. Association between the expressions of PD ‐L1 in tumor cells and those of PD ‐1 in stroma was significant. However, PD ‐L2 expression in the tumor had no significant correlation with expression in TIMC s. PD ‐L1, PD ‐L2 and PD ‐1 expressions in stroma were not associated with patient prognosis. Conclusions High PD ‐L1 expression in SDC was strongly associated with unfavorable prognosis, indicating that PD ‐1/ PD ‐L1 inhibitors could be effective in SDC .