Together with the higher expression of GA2ox, HMGCR, GERD, OSC6, menB, 4CL and wrbA, the increased GGPS expression and the higher levels of the terpenoid class of compounds (particularly diterpenoids) suggests that BC triggers terpenoid biosynthesis (Figure 4; Tables S3 and S4). The gene discussed is HMGCR; the disease is breast cancer.