Decision regret in men living with and beyond non-metastatic prostate cancer in the UK: A population-based patient-reported outcome study

Objective. Clinical options for managing non-metastatic prostate cancer (PCa) vary. Each option has associated side-effects leading to difficulty in decision-making. This study aimed to assess the relationship between patient involvement in treatment decision-making and subsequent decision regret (DR), and quantify the impact of health-related quality of life (HRQL) outcomes on DR. Methods: Men living in the United Kingdom, 18-42 months post-diagnosis of PCa were identified from cancer registration data and sent a questionnaire. Measures included the Decision Regret Scale (DRS), Expanded Prostate cancer Index Composite short form (EPIC-26), EQ-5D-5L and an item on involvement in treatment decision-making. Multivariable ordinal regression was utilised with DR categorised as none, mild or moderate/severe regret. Results. 17,193 men with stage I-III PCa completed the DRS: 36.6% reported no regret, 43.3% mild regret and 20.0% moderate/severe regret. The odds of reporting DR were greater if men indicated their views were not taken into account (OR=6.42, 95%CI 5.39-7.64) or were involved ‘to some extent’ in decision-making (OR=4.63, 95%CI 4.27-5.02), compared to men who were ‘definitely’ involved. After adjustment, including for involvement, men reporting moderate/big problems with urinary, bowel or sexual function were more likely to experience regret compared to men with no/small problems. Better HRQL scores were associated with lower levels of DR. Conclusions. This large-scale study demonstrates the benefit of patient involvement in treatment decision-making for non-metastatic PCa. However, men experiencing side-effects and poorer HRQL report greater DR. Promoting engagement in clinical decision-making represents good practice and may reduce the risk of subsequent regret