SN types (percentage) reported by each source, overall, and by HCT type. Percentages based on solid SNs excluding NMSC and other/unknown neoplasms diagnosed after 1990, after the first HCT and before the end of follow-up (defined as the earliest occurrence of a second HCT, death, last known alive status from either CCR or CIBMTR, or the study end date [31 December 2018]). For each patient, a maximum of 1 SN per type is counted, but patients with multiple SNs can contribute to >1 SN type. In CIBMTR, there were a total of 470 SNs diagnosed among 457 patients. In CCR, there were a total of 656 SNs among 611 patients.