P1, N=40, Active, not recruiting, University of Colorado, Denver | Recruiting --> Active, not recruiting | Trial primary completion date: Feb 2026 --> Jul 2025

We recently completed a clinical trial in dogs with DLBCL using a combination of canine anti-CD20 antibody and low dose doxorubicin followed by one of three small molecule immune-modulating agents (KPT-9274, TAK-981 or RV1001). To facilitate point-of-care PBMC gene expression testing that could be used to distinguish those dogs likely to require more intensive treatment regimens in advance of relapse, we developed qPCR assays for TBHD, NPNT and ISG20 . Together these data provide proof of principle that biomarker interrogation in PBMCs can help predict early relapse and poor responders to inform clinical management of DLBCL.

Combining the PAK4 inhibitor KPT-9274 with the MCL-1 antagonist S63845 induces synergistic lethality in AML cells. These findings provide the mechanistic insight of MYC stabilization in AML and establish a PAK4 inhibition-based targeted strategy as a promising therapeutic approach for AML treatment.

Human acute myeloid leukemia (AML) cell lines with partial loss of NAMPT and primary samples from patients with -7 AML demonstrated heightened sensitivity to the NAMPT inhibitor KPT-9274 compared to control samples...These findings indicate that NAMPT heterozygosity is a therapeutic vulnerability in high-risk myeloid malignancies with -7/del(7q) and recommend NAMPT levels as a biomarker for NAMPT inhibitor sensitivity. This study also establishes a data-driven framework for identifying collateral lethal genes in cancers with recurrent chromosomal deletions.

We propose that the MASTL/YBX1/PAK4 axis, which is activated by stress-induced STK24, plays a crucial role in lenvatinib tolerance. Inhibiting this axis by targeting MASTL effectively overcomes lenvatinib resistance in HCC.

In summary, we found that KGF secreted by HSCs activated PAK4, which phosphorylated S315 and promoted protein stability of BMI1, and further promoted liver fibrosis and HCC stemness through the PI3K/AKT signaling pathway. Our present study deeply studied the interaction and mechanism between HSCs and HCC, which might provide a new insight for HCC therapy.

Notably, compound 12i could effectively inhibit triple-negative breast cancer (TNBC) growth with little toxicity in the MDA-MB-231 cell xenograft model. Taken together, in vitro and in vivo results demonstrated that compound 12i possessed high drug potential as an inhibitor of PAK4 to inhibit the growth and metastasis of TNBC.

KPT-9274, a PAK4 inhibitor, significantly reduces the growth of triple-negative breast cancer cells and mammary tumors in mouse models, and it also inhibits the growth of several other types of cancer cells...Molecular docking studies were also used to help us better understand the mechanism by which PAK4 inhibitors block PAK4 and NAMPT activity, and we identified specific residues on the PAK4 inhibitors that interact with NAMPT and PAK4. Our results suggest that PAK4 inhibitors may have a more complex mechanism of action than previously understood, necessitating further exploration of how they influence cancer cell growth.

In U2OS cells, PAK4 was involved in the stabilization of PD-L1 from ubiquitin-mediated proteasomal degradation and the in vivo infiltration of immune cells such as regulatory T cells and PD1-, CD4-, and CD8-positive cells in mice tumors. In conclusion, this study suggests that PAK4 is involved in the progression of osteosarcoma by promoting proliferation, invasion, and resistance to doxorubicin and stabilized PD-L1 from proteasomal degradation.

Finally, the whole molecular pathway was verified by the results of in vivo drug combination tests, clinical specimen detection and the prognosis. In summary, our results suggest that the combination of RAC1 inhibitors with PTX can reverse PTX resistance by inducing pyroptosis through the PAK4/MAPK pathway.

This study confirms the upregulation of UCHL1, SNRNP200, and PAK4 as significant factors in the progression of high-grade CCRCC, linking their enhanced expression to poor clinical outcomes. These findings propose these proteins as potential prognostic markers and therapeutic targets in CCRCC, offering novel insights into the molecular landscape of this malignancy and highlighting the importance of targeted therapeutic interventions.

These DCs augmented CD8+ T-cell activation upon co-culture. Our results suggest that PAK4 inhibition in OSCC can have direct anti-tumour and immunomodulatory effects, which might benefit the treatment of this malignancy.