Background The COVID-19 pandemic (officially declared on the 11th of March, 2020), and the resulting measures, are impacting daily life and medical management of breast cancer patients and survivors. We evaluated to what extent these changes have affected quality of life, physical and psychosocial wellbeing of patients (being) treated for breast cancer. Methods This study was conducted within a prospective, multicentre cohort of breast cancer patients and survivors (UMBRELLA). Shortly after the implementation of COVID-19 measures, an extra survey was sent to 1,595 participants, including validated EORTC QLQ-C30/BR23 and HADS questionnaires. Patient-reported outcomes (PROs) were compared to the most recent PROs collected within UMBRELLA pre-COVID-19. The impact of COVID-19 on PROs was assessed using mixed model analysis, adjusting for potential confounders. Results 1,051 patients and survivors (65.9%) completed the survey; 31.1% (n = 327) reported a higher threshold to contact their general practitioner amid the COVID-19 pandemic. A statistically significant deterioration in emotional functioning was observed (82.6 [SD = 18.7] to 77.9 [SD = 17.3], p < .001), and 505 (48.0%, 95%CI = 45.0 to 51.1%) reported moderate to severe loneliness. Small improvements were observed in QoL, physical-, social- and role functioning. In the subgroup of 51 patients under active treatment, social functioning strongly deteriorated (77.3 [95%CI = 69.4 to 85.2] to 61.3 [95%CI = 52.6 to 70.1], p = .002). Conclusion During the COVID-19 pandemic, breast cancer patients and survivors were less likely to contact physicians and experienced a deterioration in their emotional functioning. Patients undergoing active treatment reported a substantial drop in social functioning. One in two reported loneliness that was moderate or severe. Online interventions supporting mental health and social interaction are needed during times of social distancing and lockdowns.

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Purpose To identify factors associated with (perceived) access to health care among (ex-)breast cancer patients during the COVID-19 pandemic. Methods Cross-sectional study within a large prospective, multicenter cohort of (ex-)breast cancer patients, i.e., UMBRELLA. All participants enrolled in the UMBRELLA cohort between October 2013 and April 2020 were sent a COVID-19-specific survey, including the Hospital Anxiety and Depression Scale (HADS) questionnaire. Results In total, 1051 (66.0%) participants completed the survey. During COVID-19, 284 (27.0%) participants reported clinically relevant increased levels of anxiety and/or depression, i.e., total HADS score ≥ 12. Participants with anxiety and/or depression reported statistically significant higher barriers to contact their general practitioner (47.5% vs. 25.0%, resp.) and breast cancer physicians (26.8% vs. 11.2%, resp.) compared to participants without these symptoms. In addition, a higher proportion of participants with anxiety and/or depression reported that their current treatment or (after)care was affected by COVID-19 compared to those without these symptoms (32.7% vs. 20.5%, resp.). Factors independently associated with symptoms of anxiety and/or depression during COVID-19 were pre-existent anxiety (OR 6.1, 95% CI 4.1–9.2) or depression (OR 6.0, 95% CI 3.5–10.2). Conclusion During the COVID-19 pandemic, (ex-)breast cancer patients with symptoms of anxiety and/or depression experience higher barriers to contact health care providers. Also, they more often report that their health care was affected by COVID-19. Risk factors for anxiety and/or depression during COVID-19 are pre-existent symptoms of anxiety or depression. Extra attention—including mental health support—is needed for this group.