PD-1 underexpression

Our findings demonstrate that IL-38 expression in colorectal regional nodes from CRC patients is inversely correlated with PD-1/PD-L1 but positively correlated with infiltrating CD4+ or CD8+ lymphocytes. The combined assessment of IL-38 and PD-1 expression in colorectal regional nodes emerges as a promising biomarker for predicting the prognosis of CRC.

PD-1 expression on T-cells might serve as an adverse biomarker for lymphoma patients undergoing autologous stem cell transplantation, however further validation by larger prospective studies is required.

Immune-associated transcriptomic features, particularly CD8+ T cells were associated with pCR response to ICI in dMMR CRC. Heterogeneity of TME within dMMR CRC may help to discriminate patients with complete response to neoadjuvant ICI.

TILs are a heterogenous group of immune cells that recognize and attack the tumor, thus are utilized in various clinical trials. In our study, we explored the TILs in patients with kidney cancer by expanding the TILs using a clinical-grade protocol, as well as observed their characteristics and ability to recognize the tumor using in-depth experimental and computational tools.

In conclusion, patients who underwent allo-SCT exhibited high PD-1 expression, suggesting that allo-SCT increases PD-1 expression on T cells, and the patients with high PD-1 expression on CD8+T cells after allo-SCT showed the poor prognosis. For these patients, PD-1 blockade could be an immunotherapeutic strategy.

Dual-luciferase assays indicated that miR-139-5p interacted with the 3' untranslated region (3'-UTR) of PD1. These results showed that paeonol alleviates PD1-mediated antitumor immunity by reducing miR-139-5p expression and demonstrated a novel mechanism for melanoma immunotherapy.

However, In vivo LLC1 murine lung cancer syngeneic model showed highest attenuated tumor growth when vTRAIL was treated (WT < vAng1 < vTRAN < vTRAIL), which was in accordance with CD8 high PD1 low expression levels in the tissues. It concludes that engineered vaccinia virus harboring TRAIL (vTRAIL) is the promising therapeutic option for in vivo lung cancer therapy.

The PD-1/PD-L1 may induce immune suppression in OLK and accelerate the progress of malignant transformation.

Pathway enrichment showed that the focal adhesion (P=0.005) and actin cytoskeleton (P=0.022) pathways were associated with OS. This study aimed to identify the classification of hot and cold tumors, and develop a novel signature to predict the ICI treatments response for PD-1/PD-L1 high expression NSCLC patients.

In HCC, nivolumab and pembrolizumab are described as possible second line therapies. In concordance with previous reports, we found an association between low frequency of PD-1 expression and increased HCC recurrence, as well as the lack of impact of PD-L1 expression on HCC recurrence. Furthermore, our results suggest that HCC recurrence may be more frequent in immune-exclusive tumors. Pembrolizumab as adjuvant instead of 2nd line therapy should be further investigated.

Low lymphocyte count or elevated expression of the PD-1 checkpoint inhibitor is associated with incomplete response to LDT and increased risk of bridge-to-transplant tumor progression. Patients with impaired T cell homeostasis may benefit from PD-1 immunotherapy to improve response to LDT and improve bridge-to-transplant outcomes.