Kusterer, L. J., Reeh, M., Kumar, Y., Clauditz, T., Woestemeier, A., Pantel, K., Melling, N., Perez, D., Izbicki, J., Riethdorf, S., Konczalla, L. (2026). PD-L1-positive circulating tumor cells associate with tumor malignancy and impaired circulating immunity in patients with gastrointestinal tumors. Scientific Reports. https://doi.org/10.1038/s41598-026-43324-y