title: Interim monitoring of efficacy data is important and appropriate.
authors.affiliation: MRC Clinical Trials Unit, Cancer Group, 222 Euston Road, London NWI 2DA, UK. matthew.sydes@ctu.mrc.ac.uk
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Sydes
authors.forename: Mahesh K B
authors.initials: MK
authors.lastname: Parmar
mesh_terms: D026661:Clinical Trials Data Monitoring Committees; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D016896:Treatment Outcome