Substitutions in thiophene structure give rise to new derivatives with different biological and pharmacological activities. The present study investigated the cytotoxicity activity of some thiophene derivatives in breast cancer cells maintained in two-dimensional (2D) or in three-dimensional (3D) culture and evaluated the anticancer mechanism of these compounds. Cytotoxicity assays were performed against untransformed cells and against breast cancer cell MCF-7. Apoptosis analysis and in-vitro migration assay were also performed to evaluate the mechanism of induction of cell death. All thiophene derivatives reduced the cell viability in breast cancer cells, showing cytotoxic activity (IC500.05). MCF-7 cells became less responsive to SB-200 and to doxorubicin in 3D culture compared with cells in 2D culture (higher IC50 values); however, SB-200 showed a better cytotoxic effect compared with doxorubicin in 3D culture. Therefore, the current study provides an insight into anticancer potential of thiophene derivatives, and further studies should be conducted to understand the mechanism by which thiophene derivatives act on cancer cells. *Flaviana Alves Dos Santos and Michelly Cristiny Pereira contributed equally to the writing of this article. Correspondence to Michelly Cristiny Pereira, PhD, Rua Tereza Amélia, s/n, Cidade Universitária, UFPE Cidade Universitária, 50670-901 Recife, Pernambuco, Brazil Tel/fax: +55 81 2126 7822; e-mail: michelly2305@yahoo.com.br Received April 3, 2017 Accepted November 14, 2017 Copyright © 2017 Wolters Kluwer Health, Inc. All rights reserved.
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