“…About 3500 years ago gold was used in a variety of medicines in Arabia and China, however more as a result of its precious nature than of known medicinal properties [75]. The rational use of gold in medicine started in the end of the 19 th century, when Robert Koch first described the antimicrobial activity of K[Au(CN)2] against tuberculosis [76]. Nevertheless, due the severe toxicities of gold cyanide compounds, Jacques Forestier identified the biological activities of thiolate gold compounds, which were further applied in the treatment of rheumatoid arthritis (RA) [70].…”