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Spondias pinnata, a commonly distributed tree in India, previously proven for various pharmacological properties and also reported for efficient anti-oxidant, free radical scavenging and iron chelating activity, continuing this, the present study is aimed to investigate the role of 70 % methanolic extract of S. pinnata bark (SPME) in promoting apoptosis in human lung adenocarcinoma cell line (A549) and human breast adenocarcinoma cell line (MCF-7). These two malignant cell lines and a normal cell line were treated with increasing concentrations of SPME and cell viability is calculated. SPME showed significant cytotoxicity to both A549 and MCF-7 cells with an IC₅₀ value of 147.84 ± 3.74 and 149.34 ± 13.30 μg/ml, respectively, whereas, comparatively no cytotoxicity was found in normal human lung fibroblast cell line (WI-38): IC₅₀ 932.38 ± 84.44 μg/ml. Flow cytometric analysis and confocal …