Inclusion criteria.

a. IFs added as supplementary information after completion of the project. They refer to the years 2013–2014 (except for the Journal of the American Medical Association: 2015). The numbers are rounded to one decimal place.b. We searched the Cochrane Library for Cochrane reviews and health technology assessment reports on four types of advanced solid cancer: glioblastoma (including anaplastic astrocytoma), lung cancer (stage IIIb-IV), malignant melanoma (stage IV), and pancreatic cancer (see S2 Appendix for list of reviews). To identify the most relevant specialist journals, we screened the lists of the studies included in the 19 reviews and extracted all publications of studies on these four cancer types (n = 157) as well as the names of the journals they were published in. We then assessed journal frequency: If a specific journal was included three or more times in the list of relevant study publications, then it was included in the journal pool.c. Selected additionally for glioblastoma, as the search yielded an insufficient number of hits.IC: inclusion criterion, IF: impact factor, RCT: randomized controlled trial.Inclusion criteria.