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Purpose: Despite the benefits of diet and physical activity (PA) in improving breast cancer (BC) outcomes, few lifestyle interventions focus on Latina BC survivors who are at increased risk of cardiometabolic disorders, obesity and poor BC outcomes. We developed and tested the effectiveness of the culturally-tailored ¡Mi Vida Saludable! (My Healthy Life) in-person and/or electronic health (eHealth) program on improving diet and PA among Latina BC survivors. The program was developed in collaboration with community partners and used theory-based psychosocial determinants of behavior change. Methods: Latina BC survivors were post-treatment (endocrine therapy allowed) and consumed Citation Format: Heather Greenlee, Margarita Santiago-Torres, Pamela Koch, Wei-Yann Tsai, Heewon L Gray, Adam M Brickman, Ann Ogden Gaffney, Martha Eddy, Cynthia A Thomson, Tracy E Crane, Naxielly Dominguez, Jhack Sepulveda, Amanda M. Marin-Chollom, Rachel Paul, Zaixing Shi, Kathleene T Ulanday, Hanjie Shen, Marisol Castellano, Yanette Fuentes, Katherine Crew, Kevin Kalinsky, Melissa Accordino, Meghna Trivedi, Bret Taback, Melissa Beauchemin, Fernando J Camacho, Daniel T Friedman, Isobel Contento, Dawn L. Hershman. A randomized, controlled, 2x2 factorial trial of a diet and physical activity intervention among Latina breast cancer survivors: ¡Mi Vida Saludable! study [abstract]. In: Proceedings of the 2021 San Antonio Breast Cancer Symposium; 2021 Dec 7-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2022;82(4 Suppl):Abstract nr P1-10-07.

Background: The PI3K/Akt/mTOR pathway in part impacts tumorigenesis through modulation of host immune activity. To assess the effects of Akt inhibition on the tumor micro-environment (TME), we analyzed tumor tissue from patients with operable hormone receptor positive, HER2 negative breast cancer (BC) treated on a presurgical trial with the Akt inhibitor MK-2206.Methods: Quantitative multiplex immunofluorescence (qmIF) was performed using CD3, CD8, CD4, FOXP3, CD68, and pancytokeratin on biopsy and surgical specimens of MK-2206 and untreated, control patients. nanoString was performed on surgical specimens to assess mRNA expression from MK-2206-treated vs. control patients.Results: Increased CD3+CD8+ density was observed in post vs. pre-treatment tissue in the MK-2206-treated vs. control patients (87 vs. 0.2%, p < 0.05). MK-2206 was associated with greater expression of interferon signaling genes (e.g., IFI6, p < 0.05) and lower expression of myeloid genes (CD163, p < 0.05) on differential expression and gene set enrichment analyses. Greater expression of pro-apoptotic genes (e.g., BAD) were associated with MK-2206 treatment (p < 0.05).Conclusion: Akt inhibition in operable BC was associated with a favorable immune profile in the TME, including increased CD3+CD8+ density and greater expression of interferon genes. Additional studies are warranted, as this may provide rationale for combining Akt inhibition with immunotherapy.