'I did supplement my own strength with medication...' Penny Lancaster relives emotional toll of Rod Stewart's cancer diagnosis Penny Lancaster has opened up about how she needed to "supplement my own strength with medication" when her husband Sir Rod Stewart was diagnosed with prostate cancer in 2017 but asked her to keep his 5 February 2026 Lady Penny Lancaster-Stewart has revealed she ended up on medication to cope with the emotional pain she felt over her husband Sir Rod Stewart's cancer diagnosis.