Thursday, February 19, 2026 2/19/2026

Optimizing Response to Immune Checkpoint Inhibitor Therapy for Breast Cancer: A Role for Inhibitors of the PI3K pathway

Award Number: R01CA243326
ORGANIZATION: NATIONAL CANCER INSTITUTE
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 12/11/2019
PERIOD OF PERFORMANCE END DATE: 05/31/2025

Group Awards By:

View Award Description

Optimizing Response to Immune Checkpoint Inhibitor Therapy for Breast Cancer: A Role for Inhibitors of the PI3K pathway - Metastatic breast cancer (BC) is a major health issue for women across the world. About 40,610 women and 460 men in the US are expected to die this year alone from BC. While there are numerous treatment options for hormone receptor positive (HR+) and HER2+ BC patients, the standard of care for triple negative BC (TNBC) patients largely relies on conventional chemotherapy and radiation. Improved options for treating metastatic BC represent a vast unmet medical need. Recently, several clinical trials investigated combined treatment with either HR pathway blockers or HER2 antagonists and PI3K inhibitors, since the PI3K pathway is constitutively activated or mutated in over 50% of BC patients. However, the results have shown only 2-4 months increase in progression free survival and there is extensive Grade 3 and 4 toxicity with the dosage schedules used. The discovery of immune checkpoint inhibitors (ICIs) is revolutionizing cancer therapy, but thus far BC patients are not showing strong responses to ICI therapy, due to low mutational load and minimal infiltration of CD4+ and CD8+ T cells (“cold”). Our hypothesis is that response to ICI therapy in immunologically “cold” BCs can be enhanced by combining therapies that inhibit AKT with paclitaxel (PTX) to induce immunogenic tumor cell death and shift tumor-associated immune cells to an anti-tumor phenotype. To test this hypothesis, we will utilize immune competent mouse models, organoid/immune cell co-cultures, and humanized mouse models bearing patient-derived xenograft (PDX) to determine if PI3K pathway inhibitors, when enhance response to ICIs, and improve survival in mice. There are two specific aims. Aim 1. To develop the optimal strategy for reducing growth of TNBC through treatment with an AKT inhibitor, ipatasertib, combined with paclitaxel, and immune checkpoint inhibitors (ICIs) anti-CTLA4 + anti-PD1. Using immune competent mouse models, we will determine the functional significance of reprograming the tumor immune environment in mammary tumors in response to AKT inhibition in reference to response to ICIs at early, mid and late time points during therapy. Mechanisms of therapeutic response will be investigated based upon analysis of the following parameters: toxicity; tumor growth; metastasis; immune cell content (immunome); cytokine/chemokine expression profile in tumor, bone marrow, lung and blood samples; angiogenesis; and transcriptome in responding and non- responding tumors. State of the art technology will include multiplex immunohistochemistry (IHC), flow cytometry, CyTOF, reverse phase protein analysis (RPPA), RNA sequencing (RNAseq), DNA sequencing (DNAseq) and pathway analysis. Transcriptomic and immunome signatures predicting response to treatment in mice will be compared to RNAseq data from ongoing clinical trials available to us and published “response signatures” 26. Aim 2: To determine the efficacy of treatment with AKT inhibitors combined with PTX and ICIs in two human TNBC models: 1) organoid co-cultures human TNBC plus fibroblasts, endothelial cells and patient immune cells: 2) humanized patient-derived xenografts (PDX) mouse models established from TNBC patients. Genetic/immunome signatures will be evaluated and compared to data from ongoing clinical trials.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2025 ( Subtotal = -$7,904 )
2025	2024	VANDERBILT UNIVERSITY	110 21ST AVE S	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	000	5	8/14/2025	NON-COMPETING CONTINUATION	-$7,904
														Subtotal = -$7,904

Issue Date FY: 2024 ( Subtotal = $345,281 )
2024	2024	VANDERBILT UNIVERSITY	110 21ST AVE S	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	001	5	4/16/2024	NON-COMPETING CONTINUATION	$18,173
2024	2024	VANDERBILT UNIVERSITY	110 21ST AVE S	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	000	5	1/25/2024	NON-COMPETING CONTINUATION	$327,108
														Subtotal = $345,281

Issue Date FY: 2023 ( Subtotal = $356,184 )
2023	2023	VANDERBILT UNIVERSITY	110 21ST AVE S	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	000	4	11/30/2022	NON-COMPETING CONTINUATION	$327,108
2023	2023	VANDERBILT UNIVERSITY	110 21ST AVE S	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	001	4	3/21/2023	NON-COMPETING CONTINUATION	$29,076
														Subtotal = $356,184

Issue Date FY: 2022 ( Subtotal = $356,184 )
2022	2022	VANDERBILT UNIVERSITY, THE	110 21ST AVENUE S STE 800	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	001	3	6/7/2022	NON-COMPETING CONTINUATION	$29,077
2022	2022	VANDERBILT UNIVERSITY, THE	110 21ST AVENUE S STE 800	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	000	3	11/23/2021	NON-COMPETING CONTINUATION	$327,107
														Subtotal = $356,184

Issue Date FY: 2021 ( Subtotal = $363,453 )
2021	2021	VANDERBILT UNIVERSITY, THE	110 21ST AVENUE S STE 800	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	000	2	11/19/2020	NON-COMPETING CONTINUATION	$345,279
2021	2021	VANDERBILT UNIVERSITY, THE	110 21ST AVENUE S STE 800	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	001	2	1/28/2021	NON-COMPETING CONTINUATION	$18,174
														Subtotal = $363,453

Issue Date FY: 2020 ( Subtotal = $376,492 )
2020	2020	VANDERBILT UNIVERSITY, THE	110 21ST AVENUE S STE 800	NASHVILLE	TN	37203	DAVIDSON	USA	Cancer Treatment Research	000	1	12/10/2019	NEW	$376,492
														Subtotal = $376,492

Grand Total All Awards = $1,789,690

Top

All Categories

About

Search

Reports

Data Submission

Award Information

Optimizing Response to Immune Checkpoint Inhibitor Therapy for Breast Cancer: A Role for Inhibitors of the PI3K pathway

Award Number: R01CA243326

ORGANIZATION: NATIONAL CANCER INSTITUTE

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 12/11/2019

PERIOD OF PERFORMANCE END DATE: 05/31/2025

Federal Websites

Department of Health & Human Services

HHS Operating Divisions

HHS Staff Divisions

Download A Document Viewer