Overview
11 DESCRIPTION Pemigatinib is a kinase inhibitor with the chemical name 3-(2,6-difluoro-3,5-dimethoxyphenyl)-1-ethyl-8-(morpholin-4-ylmethyl)-1,3,4,7-tetrahydro-2 H -pyrrolo[3',2':5,6]pyrido[4,3- d ]pyrimidin-2-one. Pemigatinib has a molecular formula of C 24 H 27 F 2 N 5 O 4 and molecular mass of 487.5 g/mole.
Mechanism of Action
12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Pemigatinib is a small molecule kinase inhibitor that targets FGFR1, 2 and 3 with IC 50 values of less than 2 nM. Pemigatinib also inhibited FGFR4 in vitro at a concentration approximately 100 times higher than those that inhibit FGFR1, 2, and 3. Pemigatinib inhibited FGFR1-3 phosphorylation and signaling and decreased cell viability in cancer cell lines with activating FGFR amplifications and fusions that resulted in constitutive activation of FGFR signaling. Constitutive FGFR signaling can support the proliferation and survival of malignant cells.
Indications
- 1 INDICATIONS AND USAGE PEMAZYRE is a kinase inhibitor indicated: for the treatment of adults with previously treated, unresectable locally advanced or metastatic cholangiocarcinoma with a fibroblast growth factor receptor 2 (FGFR2) fusion or other rearrangement as detected by an FDA-approved test. ( 1 , 2.1 ) This indication is approved under accelerated approval based on overall response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial(s). ( 1 , 2.
Common Doses
- 13.5 mg
- 9 mg
- 4.5 mg
- 7 mg
Dosage
2 DOSAGE AND ADMINISTRATION Cholangiocarcinoma: Confirm the presence of an FGFR2 fusion or rearrangement prior to initiation of treatment with PEMAZYRE. ( 2.1 ) Recommended dosage is 13.5 mg orally once daily for 14 consecutive days followed by 7 days off therapy in 21-day cycles. Continue treatment until disease progression or unacceptable toxicity occurs. ( 2.2 ) Myeloid/lymphoid neoplasms with FGFR1 rearrangement: Recommended dosage is 13.5 mg orally once daily. Continue treatment until disease progression or unacceptable toxicity. ( 2.
Contraindications
- 4 CONTRAINDICATIONS None. None. ( 4 )
Side Effects
- 6 ADVERSE REACTIONS The following adverse reactions are discussed elsewhere in the labeling: Ocular Toxicity [see Warnings and Precautions ( 5.1 )] Hyperphosphatemia and Soft Tissue Mineralization [see Warnings and Precautions ( 5.2 )] Cholangiocarcinoma: The most common adverse reactions (incidence ≥ 20%) are hyperphosphatemia, alopecia, diarrhea, nail toxicity, fatigue, dysgeusia, nausea, constipation, stomatitis, dry eye, dry mouth, decreased appetite, vomiting, arthralgia, abdominal pain, hypophosphatemia, back pain, and dry skin. ( 6.
Interactions
- 7 DRUG INTERACTIONS Strong and Moderate CYP3A Inducers: Avoid concomitant use of PEMAZYRE. ( 7.1 ) Strong and Moderate CYP3A Inhibitors: Avoid concomitant use. If concomitant use cannot be avoided, reduce PEMAZYRE dosage. ( 2.4 , 7.1 ) 7.1 Effect of Other Drugs on PEMAZYRE Strong and Moderate CYP3A Inducers Concomitant use of PEMAZYRE with a strong or moderate CYP3A inducer decreases pemigatinib plasma concentrations [ see Clinical Pharmacology ( 12.3 )], which may reduce the efficacy of PEMAZYRE. Avoid concomitant use of strong and moderate CYP3A inducers with PEMAZYRE.