Physachenolide C, a selective BET inhibitor, induces apoptosis and arrests the cell cycle at the G0-G1 phase, exhibiting antitumor activity [1].

Physachenolide C, at concentrations ranging from 0.01-10 μM over a 48-hour period, impedes the proliferation of Yale University Mouse Melanoma (YUMM) cell lines YUMM2.1 and YUMMER1.7, exhibiting half-maximal inhibitory concentration (IC50) values of 0.5159 μM and 1.8230 μM, respectively. Concurrently, this compound markedly elevates the population of early-stage apoptotic cells and induces cell cycle arrest at the G0-G1 phase [1].

Physachenolide C, administered intratumorally at a dose of 20 mg/kg daily for 15 consecutive doses, markedly suppressed tumor growth and induced complete regression of tumors in a murine melanoma model, without notable toxicity in the mice. Furthermore, treatment with Physachenolide C resulted in a significant elevation in the proportion of TUNEL-positive cells, reaching 40%, indicating enhanced apoptotic activity [1].