Safety Study of Danazol With Plasma Exchange and Steroids for the Treatment of Thrombotic Thrombocytopenic Purpura (TTP)

Danazol is a synthetic steroid hormone structurally resembling a group of natural hormones
(androgens)found in the body. Danazol has immune modifying activity and is effective in
treatment of blood disorders with low platelet counts such as idiopathic thrombocytopenic
purpura (however FDA has not yet approved danazol for this disorder). A study of danazol in
conjunction with plasma exchange for thrombotic thrombocytopenic purpura showed that danazol
decreased the number of plasma exchanges required by approximately 80% and reduced the time
needed to control the disease. It's not clear how danazol works in TTP. It is not approved by
the FDA for the treatment of TTP.

Inclusion Criteria:

- TTP with platelets less than 10,000 and microangiopathic hemolytic anemia

- Age greater than 18 and less than 60

- LDH > 2x upper limit of normal

- PT and PTT normal

- Patients must give signed informed consent

- Pre-menopausal woman must have negative pregnancy test.

- TTP not related to underlying cancer, treatment of cancer or transplantation.

- TTP not associated with drugs.

Exclusion Criteria:

- LFTs AST/ALT > 2x upper limit of normal

- Hepatitis B and Hepatitis C infection.

- HIV with active opportunistic infections

- Acute or chronic Disseminated Intravascular Coagulation (DIC), defined as D-dimer
8ug/ml and fibrinogen<100 mg/dl

- TTP related to drugs, malignancy and transplantation.

- Pregnancy

- Concurrent other investigational drug use during this study.

- Porphyria.