Used primarily in chemotherapy, this compound treats chronic lymphocytic leukemia (CLL) and certain lymphomas by interfering with DNA replication in cancer cells. It alkylates DNA, leading to cross-linking and disruption of cell division, ultimately causing cell death. Due to its immunosuppressive properties, it has also been used in autoimmune conditions like nephrotic syndrome, particularly in cases where standard therapies are ineffective. Its oral formulation allows for convenient outpatient treatment, making it suitable for long-term management of slow-progressing cancers.