 Participants meeting EORTCMSG European Organization for the Research and Treatment of CancerMycoses Study Group definition of proven or culture positive probable IFD invasive fungal disease caused by rare moulds, yeasts, or dimorphic fungi i.e. fungal pathogens other than Aspergillus fumigatus or Candida species whether renally impaired or not including dialysis who require primary therapy for their IFD at the time of enrollment. 