Abstract: The present invention related to a combination of radium-224 (224Ra) and/or progeny of 224Ra, and a DNA repair inhibitor for use in the treatment of cancer. The DNA repair inhibitor can for example be a poly (ADP-ribose) polymerase inhibitor (PARPi), a MGMT inhibitor, a DNA-dependent protein kinase inhibitor (DNA-PK inhibitor), an ataxia telangiectasia and Rad3-related (ATR) kinase inhibitor, an ataxia telangiectasia mutated (ATM) kinase inhibitor, a Wee1 kinase inhibitor, or a checkpoint kinase 1 and 2 (CHK 1/2) inhibitor. The radium-224 (224Ra) and/or progeny of 224Ra can be comprised in nano- and/or micro sized particles.

Abstract: The present invention provides a polyethylene glycol (PEG) ester surfactant comprising at least one polyethylene glycol moiety and at least one fatty acyl moiety characterized in that said moieties are linked by a linkage incorporating a biodegradable methylene diester unit of formula (I)--CO.O.C(R.sup.1)(R.sup.2).O.CO-- (I)where R.sup.1 and R.sup.2 may, for example, each be a hydrogen atom or a monovalent organic group attached through a carbon atom or R.sup.1 and R.sup.2 together may, for example, form a divalent organic group attached through carbon atoms.