Special warnings
When handling daunorubicin hydrochloride all contact with the skin and mucous membranes must be avoided. Increased safety precautions for doctors and nursing staff should be observed because of the potentially mutagenic and carcinogenic action of daunorubicin hydrochloride. Special caution is also advisable for the contact with patients' excrement and vomit as they may contain daunorubicin or an active metabolite. Pregnant personnel must not be allowed to come into contact with cytostatics.
Precautions for use
Daunorubicin should be used under the direction of a clinician conversant with the management of acute leukaemia and cytotoxic chemotherapy. The haematological status of patients should be monitored regularly.
Relative contraindications are high-grade pancytopenia or isolated leuko-/thrombo-cytopenia.
Further relative contraindications are severe cardiac arrhythmias in particular ventricular tachycardias or arrhythmias with clinically relevant hemodynamic effects and clinically manifest heart failure – even in the history, myocardial infarction, severe disorders of the kidneys and liver, pregnancy and a poor general condition of the patient. The treating physician should weigh the benefits and risks and decide, in each individual case, on the treatment.
Uncontrolled infections, especially viral diseases (Herpes zoster) can develop into life-threatening exacerbations after daunorubicin hydrochloride administration because of its immunosuppressive effect.
Special caution should be exercised in patients with preceding, concurrent or planned radiotherapy. These patients have an increased risk of local reactions in the radiation area (recall phenomena) during treatment with daunorubicin hydrochloride. A preceding radiation of the mediastinum increases the cardiotoxicity of daunorubicin hydrochloride.
Patients should recover from acute toxicities of prior cytotoxic treatment (such as stomatitis, neutropenia, thrombocytopenia, and generalized infections) before beginning treatment with daunorubicin.
Haematopoietic system
After administration of a therapeutic dose, myelosuppression will occur in all patients. Reversible bone marrow suppression develops dose-dependently and consists primarily of leukopenia, granulocytopenia (neutropenia) and thrombocytopenia. Anaemia occurs more rarely. The nadir is achieved 8 to 10 days after starting therapy. Recovery generally occurs 2 to 3 weeks after the last injection. To avoid myelotoxic complications, careful monitoring of the blood count before and during treatment with special attention to the leukocytes, granulocytes, platelets and erythrocytes is necessary. Fever, infections, sepsis, septic shock, hemorrhages and tissue hypoxia may occur as sequelae of the myelosuppression and these may even lead to death. It must be guaranteed that a severe infection and/or bleeding episode can be treated quickly and effectively. Myelosuppression may require intensive supportive treatment.
Secondary Leukaemia
Secondary leukaemia, with or without a pre-leukaemic phase, has been reported in patients treated with anthracyclines, including daunorubicin. Secondary leukaemia is more common when such drugs are given in combination with DNA-damaging antineoplastic agents, in combination with radiotherapy, when patients have been heavily pre-treated with cytotoxic drugs, or when doses of the anthracyclines have been escalated. These leukaemias can have a 1- to 3-year latency period.
Cardiotoxicity
Damage to the myocardium is one of the major risks of treatment with daunorubicin hydrochloride. Toxic myocardial damage by daunorubicin hydrochloride can occur in two forms. The dose-independent “acute type” is manifested by supraventricular arrhythmias (sinus tachycardia, premature ventricular contractions, AV-block) and/or non-specific ECG abnormalities (ST-T wave changes, low voltage QRS complex, T waves). Angina pectoris, myocardial infarction, endomyocardial fibrosis, pericarditis/myocarditis have also been reported. In the “delayed type”, congestive cardiomyopathy may develop, especially after high cumulative doses of daunorubicin hydrochloride. Sometimes this occurs during therapy, but frequently also only months to years after completing treatment and is clinically manifested by global heart failure, which occasionally leads to death through acute heart failure. The severity and frequency of these side effects depend on the cumulative daunorubicin hydrochloride dose. Careful monitoring of the cardiac function before, during and after treatment is therefore recommended in order to identify the risk of cardiac complications as early as possible. For routine monitoring the most suitable means are ECG and the determination of the left ventricular ejection fraction (UCG, MUGA scan).
The threshold dose for adults is about 550 mg/m2, for children over two years of age about 300 mg/m2 and for children under 2 years about 10 mg/kg body weight.
Risk factors for cardiac toxicity include active or dormant cardiovascular disease, prior or concomitant radiotherapy to the mediastinal/pericardial area, previous therapy with other anthracyclines or anthracenediones, and concomitant use of drugs with the ability to suppress cardiac contractility or cardiotoxic drugs (e.g., trastuzumab). Anthracyclines including daunorubicin should not be administered in combination with other cardiotoxic agents unless the patient's cardiac function is closely monitored. Patients receiving anthracyclines after stopping treatment with other cardiotoxic agents, especially those with long half-lives such as trastuzumab, may also be at an increased risk of developing cardiotoxicity. Under these conditions, a total cumulative dose of 400 mg/m2 in adults should be exceeded only with extreme caution.
Elderly patients, patients with a history of cardiac disease or manifest arterial hypertension and thoracic irradiation are endangered to a greater degree, as are also children.
Under these conditions, a total cumulative dose of 400 mg/m2 should not be exceeded in adults. Because of an increased risk of myocardial damage in children and adolescents, long-term cardiologic follow-up observation is recommended in these cases.
Several long-term studies in children also suggest that after anthracycline treatment congestive cardiomyopathies with a latency of many years and a progredient course may occur.
In comparison to adults, already lower cumulative total doses probably lead to clinically relevant cardiac dysfunction. A publication by Steinherz et al. (JAMA, Sep 25, 1991 – Vol 266, no. 12) describes the cardiotoxic long-term side effects of doxorubicin and daunorubicin hydrochloride in 201 treated children. The patients received a cumulative total dose of doxorubicin and/or daunorubicin hydrochloride between 200 and 1275 mg/m2 (median 450 mg/m2), partly also mediastinal radiation. Treatments took place 4 to 20 years ago (median 7 years). The cardiotoxicity of doxorubicin was assumed to be comparable to that of daunorubicin hydrochloride. An impaired cardiac pumping function was seen if the shortening fraction in the echocardiogram was determined to be <29 % or the ejection fraction in the radionucleide ventriculogram <50 % or a decrease was observed upon physical exercise. The incidence of an impaired cardiac function was 11% when the cumulative anthracycline dose was below 400 mg/m2, 28% at a dose between 400mg and 599mg/m2 and 47% at a dose between 600 and 799mg/m2 and 100% in seven patients who had received more than 800mg/m2. Additional radiation increased the incidence of cardiac dysfunction at each dose stage. 9 out of 201 examined patients additionally experienced cardiac symptoms in the form of cardiac insufficiency, conduction disorders and arrthymias. In 4 out of the 9 patients affected, symptoms occurred for the first time 12 to 18 years after completion of chemotherapy.
Liver and renal function
Daunorubicin hydrochloride is metabolized predominantly in the liver and is excreted via the bile. To avoid complications monitoring of the liver function before starting treatment with daunorubicin hydrochloride is recommended. Impairment of liver function requires a dose reduction, which is based on the serum bilirubin level.
Impaired renal function can also induce an increase in toxicity. The renal function should therefore be monitored before starting treatment.
Daunorubicin should be used with care in patients at risk of hyperuricaemia (e.g. in the presence of gout, urate and renal calculi), tumour cell infiltration of the bone marrow and in patients with inadequate bone marrow reserves due to previous cytotoxic drug or radiation therapy. The cumulative dose of Daunorubicin should be limited to 400 mg/m2 when radiation therapy to the mediastinum has been previously administered. The dose of Daunorubicin should not be repeated in the presence of bone marrow depression or buccal ulceration.
Hyperuricemia and uric acid nephropathy may occur as a consequence of massive death of the leukaemic cells with possible impairment of renal function, especially in the presence of elevated pre-treatment WBC counts. The extent is dependent on the total tumor mass. Prophylactic administration of allopurinol is necessary in the treatment of acute leukaemia (first cycle) in order to avoid tubulus damage with renal failure for the above reasons. The development of a nephrotic syndrome may be induced. Blood uric acid levels, potassium, calcium phosphate, and creatinine should be evaluated after initial treatment. Hydration, urine alkalinisation, and prophylaxis with allopurinol to prevent hyperuricemia may minimise potential complications of tumor-lysis syndrome.
Immunosuppressant effects/Increased susceptibility to infections
Administration of live or live-attenuated vaccines in patients that are immuno-compromised by chemotherapeutic agents, including daunorubicin, may result in serious or fatal infections. Vaccination with a live vaccine should be avoided in patients receiving daunorubicin. Killed or inactivated vaccines may be administered; however, the response to such vaccines may be diminished.
Gastrointestinal disorders
Daunorubicin may cause nausea and vomiting. Severe nausea and vomiting may produce dehydration. Nausea and vomiting may be prevented or alleviated by the administration of appropriate antiemetic therapy.
Mucositis/stomatitis generally appears early after drug administration and, if severe, may progress over a few days to mucosal ulcerations. Most patients recover from this adverse event by the third week of therapy.
Cases of colitis, enterocolitis and neutropenic enterocolitis (typhlitis) have been observed in patients treated with daunorubicin. Treatment discontinuation and prompt appropriate medical treatment are recommended (see section 4.8).
General disorders and administration site conditions
After paravasal administration local irritation and, depending on the quantity involved, severe cellulitis, painful ulceration and tissue necrosis will occur. Under some circumstances they may require surgical intervention. Irreversible tissue damage is possible. Local phlebitis, thrombophlebitis and/or venous sclerosis/phlebosclerosis may also occur, especially if daunorubicin hydrochloride is injected into small vessels or repeatedly into the same vein. The risk of phlebitis/thrombophlebitis can be minimised by following the procedures recommended in section 4.2.
Skin and subcutaneous tissue disorders
Complete alopecia involving beard growth and the scalp, axillary and pubic hair occurs almost always with full doses of daunorubicin. This side-effect may cause distress to patients but is usually reversible, with regrowth of hair, which usually occurs within two to three months from the termination of therapy.
Reproductive system and breast disorders
Daunorubicin hydrochloride inhibits fertility. Amenorrhea and azoospermia may occur. The severity is dose dependent. Irreversible disorders of fertility are possible (see section 4.6).
Care should be taken to avoid extravasation during intravenous administration. All steps should be taken to avoid tissuing and bandages should be avoided. Facial flushing or erythematous streaking along veins indicates too rapid injection. If tissue necrosis is suspected, the infusion should be stopped immediately and resumed in another vein. Where extravasation has occurred, an attempt should be made to aspirate the fluid back through the needle. The affected area may be injected with hydrocortisone. Sodium bicarbonate (5ml of 8.4% w/v solution) may also be injected in the hope that through pH change the drug will hydrolyse. The opinion of a plastic surgeon should be sought as skin grafting may be required.
Application of ice packs may help decrease local discomfort and also prevent extension. Liberal application of corticosteroid cream and dressing the area with sterile gauze should then be carried out.
Infections and infestations
Each patient should be given a clinical and bacteriological examination to determine whether infection is present; any infection should be adequately eliminated before treatment with Daunorubicin which might depress the bone marrow to the point where anti-infective agents would no longer be effective. If during daunorubicin treatment a patient becomes febrile (regardless of the neutrophil count), treatment with broad spectrum antibiotics should be initiated. If facilities are available, patients should be treated in a germ-free environment or, where it is not possible, reverse barrier nursing and aseptic precautions should be employed.
Anti-infective therapy should be employed in the presence of suspected or confirmed infection and during a phase of aplasia. It should be continued for some time after the marrow has regenerated. Care should also be used in patients at risk of infection.
Haematology
Daunorubicin can produce bone marrow suppression. Daunorubicin should be administered with caution when the neutrophil count is <1,500/mm3. Febrile neutropenia has been reported when daunorubicin is given in combination with other antineoplastic treatments.
Monitoring of blood counts prior to and during daunorubicin treatment is recommended, and haematological abnormalities should be treated promptly.
Posterior Reversible Encephalopathy Syndrome (PRES, also known as Reversible Posterior Leukoencephalopathy Syndrome, RPLS)
Cases of PRES have been reported with daunorubicin used in combination chemotherapy. PRES is a neurological disorder which can present with headache, seizure, lethargy, confusion, blindness and other visual and neurologic disturbances. Mild to severe hypertension may be present. Magnetic resonance imaging is necessary to confirm the diagnosis of PRES. In patients with PRES, the discontinuation of daunorubicin treatment should be considered.
Secondary malignancies
Secondary malignancies have been reported when daunorubicin was given in combination with other antineoplastic treatments known to be associated with secondary malignancies. Secondary malignancies (including leukemia) may occur during daunorubicin-containing therapy, or several months or years after the end of therapy. Patients should be monitored for secondary malignancies.