Fresh tumor samples preserved in RNAlater (Qiagen, Hilden, Germany) were obtained in conjunction with routine clinical sampling by a diagnostic pathologist in regional pathology departments (see 5 (link)). RNA and DNA were extracted using the Qiagen Allprep extraction kit (Qiagen) as described33 (link). DNA from whole blood was extracted by the Labmedicin Skåne Biobank.