Introduction: Anacardium occidentale or cashew are popular traditional food and have raised research interest for complementary cancer treatment. Cancer has become leading cause of death and treatment involved severe side effects. In present study, we aim to study the anti-proliferative effects of cashew shoots in breast cancer (MDAMB-231), colorectal cancer (HT-29) and liver cancer (HepG2) cell lines. Methods: Cell lines were treated with 70% ethanolic cashew extract for cytotoxicity test with MTT assay. AO/PI dual fluorescent assay and RNase/PI staining were used to determine apoptosis induction effects. Phytochemicals screening was carried out by using gas chromatography mass spectrometry (GCMS) and liquid chromatography mass spectrometry (LCMS). Results: The cytotoxicity assay of cashew shoot extract demonstrated IC50 of 81.1 ± 0.11 μg/ml for MDA-MB-231, 307.5 ± 2.31 μg/ml for HT-29 and 272.6 ± 1.91 μg/ml for HepG2 cell lines. The apoptotic bodies include chromatin condensation, cell blebbing and nuclear fragmentation and apoptosis induction were shown by AO/PI staining. There was significant increase of cell count in sub-G0 phase in MDA-MB-231 cell lines treated with cashew shoot extract. It was demonstrated that cashew shoot extract contained 38 compounds from GCMS such as sitosterol, tannin, pyrogallol, phenol and 20 compounds from LCMS such as citric acid, gallic acid, myricetin and hinokiflavone that may give rise to its anti-cancer effect. Conclusion: Cashew shoot extract demonstrated potential anti-cancer properties thus further study is required to investigate its mechanism as anti-cancer agent.