The OS of PRCA in the Ptosh database. (A) A Kaplan-Meier curve of the OS of 153 patients with PRCA in the Ptosh registration was depicted. The OS was defined as the period from the date of the diagnosis to the date of the outcome. The median period of observation was 400 days, and the presumed OS rate at 1 year was 87.6% (95% CI, 80.5-92.2%). (B) The OS curves for idiopathic and thymoma-associated PRCA were juxtaposed, while PRCA with “other” etiologies conferred an inferior survival (P = .0019). The estimated 1-year OS rates were 91.4% (95% CI, 83.4-95.6%), 92.9% (95% CI, 59.1-99.0%), and 63.1% (95% CI, 35.8-81.3%) for idiopathic, thymoma, and others, respectively.