Downregulation of TAP1 in Tumor-Free Tongue Contralateral to Squamous Cell Carcinoma of the Oral Tongue, an Indicator of Better Survival

• Main Authors: Nima Attaran, Xiaolian Gu, Philip J. Coates, Robin Fåhraeus, Linda Boldrup, Torben Wilms, Lixiao Wang, Nicola Sgaramella, Katarina Zborayova, Karin Nylander
• Format: Article
• Language: English
• Published: MDPI AG 2020-08-01
• Series: International Journal of Molecular Sciences
• Subjects: TAP1; SCCOT; field cancerization; MHC I
• Online Access: https://www.mdpi.com/1422-0067/21/17/6220
• ISSN: 1661-6596; 1422-0067

Oral cancers are surrounded by epithelium that histologically might seem normal, but genetically has aberrations. In patients with squamous cell carcinoma of the oral tongue (SCCOT), it is therefore important to study not only the tumor but also the clinically tumor-free contralateral tongue tissue that remains in the patient after treatment to map changes of prognostic and/or diagnostic value. The transporter associated with antigen processing (TAP) dimer is a key factor in the process of activating cytotoxic T cells. By downregulating the expression of TAP, tumor cells can escape cytotoxic T cell recognition. Biopsies from tumor and clinically tumor-free contralateral tongue tissue in 21 patients with SCCOT were analyzed together with tongue biopsies from 14 healthy individuals, which served as the control group. Dividing patients into <i>TAP1</i>-high and <i>TAP1</i>-low groups according to the median <i>TAP1</i> level in tumor-free samples showed that patients with lower <i>TAP1</i> mRNA levels in tumor-free samples had better overall (<i>p</i> = 0.003) and disease-free survival (<i>p</i> = 0.002). The results showing that <i>TAP1</i> levels in tumor-free tongue tissue contralateral to the SCCOT correlate with survival is an important contribution to early diagnosis and follow up of SCCOT.