Abstract | BACKGROUND: METHODS: RESULTS: Men in all cohorts and timepoints had prevalent CTC B7-H3 expression (> 80%). We found evidence for CTC PD-L1 expression across disease states, in which > 1 positive CTC or > 50% of CTCs were positive for PD-L1 in 40 and 30% of men with mHSPC, respectively, 60 and 20% of men with mCRPC pre-ARSI, and 70 and 30% of men with mCRPC post-ARSI. CTC PD-L2 expression was present in 20-40% of men in each disease state, while CTC CTLA-4 expression was rare, present in 20% of men with mCRPC pre-ARSI and 10% of men with mCRPC post-ARSI or with mHSPC. CTC immune checkpoint expression was heterogeneous within/between men and across disease states. CONCLUSIONS: We have identified that CTCs from men with mPC heterogeneously express immune checkpoints B7-H3, PD-L1, PD-L2, and CTLA-4, and the detection of these immune checkpoints may enable monitoring on immunotherapy.
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Authors | Tian Zhang, Anika Agarwal, R Garland Almquist, Daniella Runyambo, Sally Park, Elizabeth Bronson, Rengasamy Boominathan, Chandra Rao, Monika Anand, Taofik Oyekunle, Patrick Healy, Megan A McNamara, Kathryn Ware, Jason A Somarelli, Daniel J George, Andrew J Armstrong |
Journal | Biomarker research
(Biomark Res)
Vol. 9
Issue 1
Pg. 14
(Feb 18 2021)
ISSN: 2050-7771 [Print] England |
PMID | 33602330
(Publication Type: Journal Article)
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