DISEASE CHARACTERISTICS: Patients entered into MRC-LEUK-AML11, AML12, UKALLXII, or their successors (including those undergoing bone marrow transplantation as part of the studies) who have a proven or suspected deep-seated fungal infection as listed below: Pulmonary fungal infection - proven or suspected Sinus infection - proven or suspected Fungemia - proven Chronic hepatosplenic candidosis - proven by CT/MRI Invasive cutaneous fungal infection - proven Cerebral fungal infection - proven or suspected