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BackgroundSince 2015, the European pulmonary hypertension guidelines recommend the use of combination therapy in most patients with pulmonary arterial hypertension (PAH). However, it is unclear to what extend this treatment strategy is adopted in clinical practice and if it is associated with improved long-term survival.MethodsWe analysed data from COMPERA, a large European pulmonary hypertension registry, to assess temporal trends in the use of combination therapy and survival of patients with newly diagnosed PAH between 2010 and 2019. For survival analyses, we look at annualized data and at cumulated data comparing the periods 2010–2014 and 2015–2019.ResultsA total of 2,531 patients were included. The use of early combination therapy (within 3 months after diagnosis) increased from 10.0% in patients diagnosed with PAH in 2010 to 25.0% in patients diagnosed with PAH in 2019. The proportion of patients receiving combination therapy 1 year after diagnosis increased from 27.7% to 46.3%. When comparing the 2010–2014 and 2015–2019 periods, 1-year survival estimates were similar (89.0% [95% CI, 87.2%, 90.9%] and 90.8% [95% CI, 89.3%, 92.4%]), respectively, whereas there was a slight but non-significant improvement in 3-year survival estimates (67.8% [95% CI, 65.0%, 70.8%] and 70.5% [95% CI, 67.8%, 73.4%]), respectively.ConclusionsThe use of combination therapy increased from 2010 to 2019, but most patients still received monotherapy. Survival rates at 1 year after diagnosis did not change over time. Future studies need to determine if the observed trend suggesting improved 3-year survival rates can be confirmed.

Significant differences in the clinical profile of venous thromboembolic-related outcomes were observed according to the site of cancer. These findings suggest the development of cancer-specific anticoagulant strategies as an area for further research.