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Posology: Pemexed 500 in combination with cisplatin: The recommended dose of Pemexed 500 is 500 mg/m2 of body surface area (BSA) administered as an intravenous infusion over 10 minutes on the first day of each 21-day cycle. The recommended dose of cisplatin is 75 mg/m2 BSA infused over two hours approximately 30 minutes after completion of the pemetrexed infusion on the first day of each 21-day cycle. Patients must receive adequate anti-emetic treatment and appropriate hydration prior to and/or after receiving cisplatin (see also cisplatin Summary of Product Characteristics for specific dosing advice).
Pemexed 500 as single agent: In patients treated for non-small cell lung cancer after prior chemotherapy, the recommended dose of Pemexed 500 is 500 mg/m2 BSA administered as an intravenous infusion over 10 minutes on the first day of each 21-day cycle.
Pre-medication regimen: To reduce the incidence and severity of skin reactions, a corticosteroid should be given the day prior to, on the day of, and the day after pemetrexed administration. The corticosteroid should be equivalent to 4 mg of dexamethasone administered orally twice a day (see Precautions).
To reduce toxicity, patients treated with pemetrexed must also receive vitamin supplementation (see Precautions). Patients must take oral folic acid or a multivitamin containing folic acid (350 to 1000 micrograms) on a daily basis. At least five doses of folic acid must be taken during the seven days preceding the first dose of pemetrexed, and dosing must continue during the full course of therapy and for 21 days after the last dose of pemetrexed. Patients must also receive an intramuscular injection of vitamin B12 (1000 micrograms) in the week preceding the first dose of pemetrexed and once every three cycles thereafter. Subsequent vitamin B12 injections may be given on the same day as pemetrexed.
Monitoring: Patients receiving pemetrexed should be monitored before each dose with a complete blood count, including a differential white cell count (WCC) and platelet count. Prior to each chemotherapy administration blood chemistry tests should be collected to evaluate renal and hepatic function. Before the start of any cycle of chemotherapy, patients are required to have the following: absolute neutrophil count (ANC) should be ≥1500 cells/mm3 and platelets should be ≥100,000 cells/mm3.
Creatinine clearance should be ≥45 mL/min.
The total bilirubin should be ≤1.5 times upper limit of normal. Alkaline phosphatase (AP), aspartate aminotransferase (AST or SGOT) and alanine aminotransferase (ALT or SGPT) should be ≤3 times upper limit of normal. Alkaline phosphatase, AST and ALT ≤5 times upper limit of normal is acceptable if liver has tumour involvement.
Dose adjustments: Dose adjustments at the start of a subsequent cycle should be based on nadir haematologic counts or maximum non-haematologic toxicity from the preceding cycle of therapy. Treatment may be delayed to allow sufficient time for recovery. Upon recovery patients should be retreated using the guidelines in Tables 4, 5 and 6, which are applicable for Pemexed 500 used as a single agent or in combination with cisplatin. (See Table 4.)
Click on icon to see table/diagram/imageIf patients develop non-haematologic toxicities ≥Grade 3 (excluding neurotoxicity), Pemexed 500 should be withheld until resolution to less than or equal to the patient's pre-therapy value. Treatment should be resumed according to the guidelines in Table 5. (See Table 5.)
Click on icon to see table/diagram/imageIn the event of neurotoxicity, the recommended dose adjustment for Pemexed 500 and cisplatin is documented in Table 6. Patients should discontinue therapy if Grade 3 or 4 neurotoxicity is observed. (See Table 6.)
Click on icon to see table/diagram/imageTreatment with Pemexed 500 should be discontinued if a patient experiences any haematologic or non-haematologic Grade 3 or 4 toxicity after 2 dose reductions or immediately if Grade 3 or 4 neurotoxicity is observed.
Special populations: Elderly: In clinical studies, there has been no indication that patients 65 years of age or older are at increased risk of adverse reaction compared to patients younger than 65 years old. No dose reductions other than those recommended for all patients are necessary.
Paediatric population: There is no relevant use of Pemexed 500 in the paediatric population in malignant pleural mesothelioma and non-small cell lung cancer.
Patients with renal impairment (standard cockcroft and gault formula or glomerular filtration rate measured Tc99m-DPTA serum clearance method): Pemetrexed is primarily eliminated unchanged by renal excretion. In clinical studies, patients with creatinine clearance of ≥45 mL/min required no dose adjustments other than those recommended for all patients. There are insufficient data on the use of pemetrexed in patients with creatinine clearance below 45 mL/min; therefore the use of pemetrexed is not recommended (see Precautions).
Patients with hepatic impairment: No relationships between AST (SGOT), ALT (SGPT), or total bilirubin and pemetrexed pharmacokinetics were identified. However patients with hepatic impairment such as bilirubin >1.5 times the upper limit of normal and/or aminotransferase >3.0 times the upper limit of normal (hepatic metastases absent) or >5.0 times the upper limit of normal (hepatic metastases present) have not been specifically studied.
Method of administration: Pemexed 500 is for intravenous use. Pemexed 500 should be administered as an intravenous infusion over 10 minutes on the first day of each 21-day cycle.
For precautions to be taken before handling or administering Pemexed 500 and for instructions on reconstitution and dilution of Pemexed 500 before administration, see Special precautions for disposal and other handling under Cautions for Usage.
