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The organo-osmium complex [Os II (ɳ 6 - p -cym)(PhAzPy-NMe 2 )I] +  (FY26) exhibits promising  in vitro  antitumour activity against mouse hepatocarcinoma Hepa1–6 and other mouse or human cancer cell lines. Here, we drastically enhance water solubility of FY26 through the replacement of the PF 6  −  counter-anion with chloride using a novel synthesis method. FY26⋅PF 6  and FY26⋅Cl displayed similar  in vitro  cytotoxicity in two cancer cell models. We then show the moderate and late anticancer efficacy of FY26⋅PF 6  and FY26⋅Cl in a subcutaneous murine hepatocarcinoma mouse model. Both efficacy and tolerability varied according to FY26 circadian dosing time in hepatocarcinoma tumour-bearing mice. Tumour and liver uptake of the drug were determined over 48 h following FY26⋅Cl administration at Zeitgeber time 6 (ZT6), when the drug is least toxic (in the middle of the light span when mice are resting). Our studies suggest the need to administer protracted low doses of FY26 at ZT6 in order to optimize its delivery schedule, for example through the use of chrono-releasing nanoparticles.

Dose- and time-dependent tolerability and efficacy of organo-osmium complex FY26 and its tissue pharmacokinetics in hepatocarcinoma-bearing mice