MTT assay analyzing the viability of MCF-7 cells after treatment with the bark, seed, or total fruit extracts of açaí. (A) The three hydroalcoholic extracts of açaí caused significant reduction in MCF-7 cell viability after 24 and 48 h of treatment. *p < 0.05, **p < 0.01. One-way analysis of variance (ANOVA) followed by Dunnett’s post hoc test. (B) Comparison using the same concentration of the three different extracts. Treatment of cells with total fruit and seed extract for 24 and 48 h was significantly more effective than the bark extract in MCF-7 cells. *p < 0.05, **p < 0.01, ***p < 0.001. One-way analysis of variance (ANOVA), followed by Tukey’s post hoc test.