Olson 1977.

Study characteristics
Methods	Randomised, but no information on method of randomisation.
Participants	Women with breast cancer recurrence in chest wall or regional lymph nodes.
Interventions	All women received radiotherapy. Randomised interventions: 1. control; 2. actinomycin‐D.
Outcomes	Local control. Median survival.
Notes	1962 to 1971. 32 women were randomised. Results not available on relapses or deaths.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear