Summary of the safety profile
Dose-limiting bone marrow suppression is the most significant toxicity associated with ETOPOPHOS therapy. In clinical studies in which ETOPOPHOS was administered as a single agent at a total dose of ≥450 mg/m2 the most frequent adverse reactions of any severity were leukopenia (91%), neutropenia (88%), anaemia (72%) thrombocytopenia (23%), asthenia (39%), nausea and/or vomiting (37%), alopecia (33%) and chills and/or fever (24%).
Tabulated summary of adverse reactions
The following adverse reactions were reported from ETOPOPHOS clinical studies and post-marketing experience. These adverse reactions are presented by system organ class and frequency, which is defined by the following categories: very common (≥1/10); common (≥1/100 to <1/10); uncommon (≥1/1,000 to <1/100); rare (≥1/10,000 to <1/1,000); very rare (<1/10,000); not known (cannot be estimated from the available data).
| System Organ Class | Frequency | Adverse Reaction (MedDRA Terms) |
| Infections and infestations | common | Infection* |
| Neoplasms benign, malignant and unspecified (including cysts and polyps) | common | acute leukaemia |
| Blood and lymphatic system disorders | very common | anaemia, leukopenia, myelosuppression**, neutropenia, thrombocytopenia |
| Immune system disorders | common | anaphylactic reactions*** |
| not known | angioedema, bronchospasm |
| Metabolism and nutrition disorders | not known | tumour lysis syndrome |
| Nervous system disorders | common | dizziness |
| uncommon | neuropathy peripheral |
| rare | cortical blindness transient, neurotoxicities (e.g., somnolence and fatigue), optic neuritis, seizure**** |
| Cardiac disorders | common | arrhythmia, myocardial infarction |
| Vascular disorders | common | hypertension, transient systolic hypotension following rapid intravenous administration |
| uncommon | haemorrhage |
| Respiratory, thoracic and mediastinal disorders | rare | interstitial pneumonitis, pulmonary fibrosis |
| not known | bronchospasm |
| Gastrointestinal disorders | very common | abdominal pain, anorexia, constipation, nausea and vomiting |
| common | diarrhoea, mucositis (including stomatitis and esophagitis) |
| rare | dysgeusia, dysphagia |
| Hepatobiliary disorders | very common | alanine aminotransferase increased, alkaline phosphatase increased, aspartate amino transferase increased, bilirubin increased, hepatotoxicity |
| Skin and subcutaneous tissue disorders | very common | alopecia, pigmentation |
| common | pruritus, rash, urticaria |
| rare | Radiation recall reaction (dermatologic), Stevens-Johnsons syndrome, toxic epidermal necrolysis |
| Renal and urinary disorders | not known | acute renal failure |
| Reproductive system and breast disorders | not known | infertility |
| General disorders and administration site conditions | very common | asthenia, malaise |
| common | extravasation*****, phlebitis |
| rare | pyrexia |
| *including opportunistic infections like pneumocystis jirovecii pneumonia **Myelosuppression with fatal outcome has been reported ***Anaphylactic reactions can be fatal ****Seizure is occasionally associated with allergic reactions. *****Post-marketing complications reported for extravasation included local soft tissue toxicity, swelling, pain, cellulitis, and necrosis including skin necrosis. |
Description of selected adverse reactions
In the paragraphs below the incidences of adverse events, given as the mean percent, are derived from studies that utilized single agent ETOPOPHOS therapy.
Haematological Toxicity
Myelosuppression (see section 4.4) with fatal outcome has been reported following administration of etoposide phosphate. Myelosuppression is most often dose-limiting. Bone marrow recovery is usually complete by day 20, and no cumulative toxicity has been reported. Granulocyte and platelet nadirs tend to occur about 10 to14 days after administration of etoposide phosphate depending on the way of administration and treatment scheme. Nadirs tend to occur earlier with intravenous administration compared to oral administration. Leukopenia and severe leukopenia (less than 1,000 cells/mm3) were observed in 91% and 17%, respectively, for etoposide phosphate.
Thrombocytopenia and severe thrombocytopenia (less than 50,000 platelets/mm3) were seen in 23% and 9% respectively, for etoposide phosphate. Reports of fever and infection were also very common in patients with neutropenia treated with etoposide phosphate. Bleeding has been reported.
Gastrointestinal Toxicity
Nausea and vomiting are the major gastrointestinal toxicities of etoposide phosphate. The nausea and vomiting can usually be controlled by antiemetic therapy.
Alopecia
Reversible alopecia, sometimes progressing to total baldness, was observed in up to 44% of patients treated with etoposide phosphate.
Hypotension
Transient hypotension following rapid intravenous administration has been reported in patients treated with etoposide phosphate and has not been associated with cardiac toxicity or electrocardiographic changes. Hypotension usually responds to cessation of infusion of etoposide phosphate and/or other supportive therapy as appropriate.
When restarting the infusion, a slower administration rate should be used. No delayed hypotension has been noted.
Hypertension
In clinical studies involving etoposide phosphate, episodes of hypertension have been reported. If clinically significant hypertension occurs in patients receiving etoposide phosphate, appropriate supportive therapy should be initiated.
Hypersensitivity
Anaphylactic reactions have been reported to occur during or immediately after intravenous administration of etoposide phosphate. The role that concentration or rate of infusion plays in the development of anaphylactic reactions is uncertain. Blood pressure usually normalizes within a few hours after cessation of the infusion.
Anaphylactic reactions can occur with the initial dose of etoposide phosphate.
Anaphylactic reactions (see section 4.4), manifested by chills, tachycardia, bronchospasm, dyspnoea, diaphoresis, pyrexia, pruritus, hypertension or hypotension, syncope, nausea and vomiting have been reported to occur in 3% (7 of 245 patients treated with ETOPOPHOS in 7 clinical studies) of patients treated with ETOPOPHOS. Facial flushing was reported in 2% of patients and skin rashes in 3%. These reactions have usually responded promptly to the cessation of the infusion and administration of pressor agents, corticosteroids, antihistamines, or volume expanders as appropriate.
Acute fatal reactions associated with bronchospasm have also been reported with etoposide phosphate. Apnoea with spontaneous resumption of breathing following cessation of infusion have also been reported.
Metabolic Complications
Tumour lysis syndrome (sometimes fatal) has been reported following the use of etoposide phosphate in association with other chemotherapeutic drugs (see section 4.4).
Acute renal failure
Reversible acute renal failure has been reported in post-marketing experience (see section 4.4).
Paediatric population
The safety profile between paediatric patients and adults is expected to be similar.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.