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Cancer Testis Antigens and Immunotherapy: Expression of PRAME and NY-ESO-1 Predicts Survival in Soft Tissue Sarcoma
: Received: 22 July 2020 / Approved: 25 July 2020 / Online: 25 July 2020 (11:23:54 CEST)
A peer-reviewed article of this Preprint also exists.
Journal reference: Cancers 2020, 12, 3612
Background: PRAME, NY-ESO-1 and SSX2 are cancer testis antigens (CTAs), which in normal tissues are expressed in testicular germ cells with re-expression in numerous cancer types. Their ability to elicit humoral and cellular immune responses have rendered them promising targets for cancer immunotherapy, but they have never been studied in a large and well-characterized cohort soft tissue sarcomas (STS). Methods: On protein level, we examined PRAME, NY-ESO-1 and SSX2 expression in tumour tissues of 249 STS using immunohistochemistry. We correlated expression levels with clinicopathological parameters including Tumour-infiltrating lymphocyte (TIL) counts, grading and long- term survival. Results: Expression of PRAME, NY-ESO-1 and SSX2 was observed in 25 (10%), 19 (8%), and 11 (4%) of 249 specimens with distinct patterns for histo subtypes. Expression of PRAME was associated with shorter patient survival (p=0.005) and higher grade (G2 vs G3, p=0.001) while NY-ESO-1 expression was correlated with more favourable survival (p=0.037) and low grade (G2 vs G3, p=0.029). Both PRAME and NY-ESO-1 expression was more frequent in STS with low TILs counts. Conclusions: CTAs PRAME, NY-ESO-1 and SSX2 show distinct expression patterns in different STS subtypes. These results may guide future immunotherapeutic approaches in STS.
soft tissue sarcoma; human; cancer/testis antigens; PRAME; NY-ESO-1; SSX2; biomarker; tumor infiltrating lymphocytes; immunohistochemistry
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