Limonene, a component of orange essential oil, has been investigated as a potential cancer treatment. A study from 2012 found that orange oil rich in limonene both inhibited the growth and promoted the death of colon cancer cells in culture. Ref: https://pubmed.ncbi.nlm.nih.gov/22935404/

A 2017 studyTrusted Source found that orange essential oil inhibited the growth of lung and prostate cancer cell lines in culture. Additionally, increased cell death was seen in the lung cancer cell line. Orange essential oil was also observed to have antioxidant activity. Ref: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6152265/

Summary

Studies have indicated that orange essential oil or its components can inhibit the growth and lead to cell death in some cultured cancer cell lines.

Because these studies were done in a test tube and not in the human body, additional research is needed to learn more about these properties.