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J Natl Cancer Inst. 2015 Mar 16;107(5). pii: djv040. doi: 10.1093/jnci/djv040. Print 2015 May.

Modulation of murine breast tumor vascularity, hypoxia and chemotherapeutic response by exercise.

Author information

1
Duke Cancer Institute, Duke University Medical Center, Durham, NC (ASB, CDL, DW, CL, PMS, GRD, GP, MWD); Department of Internal Medicine, Massachusetts General Hospital, Boston, MA (ASB); Memorial Sloan Kettering Cancer Center, New York, NY (LWJ).

Abstract

Exercise has been shown to improve postischemia perfusion of normal tissues; we investigated whether these effects extend to solid tumors. Estrogen receptor-negative (ER-, 4T1) and ER+ (E0771) tumor cells were implanted orthotopically into syngeneic mice (BALB/c, N = 11-12 per group) randomly assigned to exercise or sedentary control. Tumor growth, perfusion, hypoxia, and components of the angiogenic and apoptotic cascades were assessed by MRI, immunohistochemistry, western blotting, and quantitative polymerase chain reaction and analyzed with one-way and repeated measures analysis of variance and linear regression. All statistical tests were two-sided. Exercise statistically significantly reduced tumor growth and was associated with a 1.4-fold increase in apoptosis (sedentary vs exercise: 1544 cells/mm(2), 95% CI = 1223 to 1865 vs 2168 cells/mm(2), 95% CI = 1620 to 2717; P = .048), increased microvessel density (P = .004), vessel maturity (P = .006) and perfusion, and reduced intratumoral hypoxia (P = .012), compared with sedentary controls. We also tested whether exercise could improve chemotherapy (cyclophosphamide) efficacy. Exercise plus chemotherapy prolonged growth delay compared with chemotherapy alone (P < .001) in the orthotopic 4T1 model (n = 17 per group). Exercise is a potential novel adjuvant treatment of breast cancer.

PMID:
25780062
PMCID:
PMC4822524
DOI:
10.1093/jnci/djv040
[Indexed for MEDLINE]
Free PMC Article

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