Six plants were studied and proved effective against breast cancer models, inducing a decrease in HSP90 expression (Table 4), as follows: the seeds of Foeniculum vulgare, the whole plant of Spatholobus suberectus, the aerial parts of Flueggea leucopyrus, the leaves and stems of Tubocapsicum anomalum, and the leaves of Trianthema portulacastrum and Jasminum multiflorum. The gene discussed is HSP90AB1; the disease is breast carcinoma.