Background: Breast cancer is one of the most common cancers among women in the world in which markers such as human epidermal growth factor receptor 2 (HER-2), estrogen receptors (ER) and progesterone receptors (PR) are considered important prognostic markers. The aim of this study was to investigate the effect of a six-week swimming training program combined with Aloe vera extract on HER-2, ER and PR in mice with breast cancer.

Materials and Methods: The adenocarcinoma tumor implants through surgery in subcutaneously into 35 BALB/c mice and after a week they were divided into five groups: 1-training, 2- extract, 3-training+extract, 4- control (cancer) and 5- healthy control (without training or extract). Training groups performed a swimming training program for six weeks (10-60 minutes swimming, 3 days per week). Blood samples were taken 48 hours after the last bout to be analyzed for serum levels of HER-2, ER and PR.

Results: The results of the present study showed that the induction of adenocarcinoma caused a significant increase in serum levels of HER-2, ER and PR. Moreover, the training program and Aloe vera extract significantly decreased serum levels of HER-2, ER and PR compared to the control group.

Conclusion: These findings are promising regarding the probable potential of both interventions to reduce serum levels of these tumor markers however, it needs to be validated by further studies.