Verzenio

Abemaciclib.

Verzenio 100 mg film-coated tablets: Each film-coated tablet contains 100 mg abemaciclib.
Excipients with known effect: Each film-coated tablet contains 28 mg of lactose monohydrate.
Verzenio 150 mg film-coated tablets: Each film-coated tablet contains 150 mg abemaciclib.
Excipients with known effect: Each film-coated tablet contains 42 mg of lactose monohydrate.
Excipients/Inactive Ingredients: Tablet core: croscarmellose sodium, lactose monohydrate, microcrystalline cellulose, colloidal hydrated silica, sodium stearyl fumarate.
Film coating: Verzenio 100 mg film-coated tablets: polyvinyl alcohol (E1203), titanium dioxide (E171), macrogol (E1521), talc (E553b).
Verzenio 150 mg film-coated tablets: polyvinyl alcohol (E1203), titanium dioxide (E171), macrogol (E1521), talc (E553b), iron oxide yellow (E172).

Pharmacotherapeutic group: Antineoplastic agents, protein kinases inhibitors. ATC code: L01XE50.
Pharmacology: Pharmacodynamics: Mechanism of action: Abemaciclib is a potent and selective inhibitor of cyclin-dependent kinases 4 and 6 (CDK4 and CDK6), and most active against Cyclin D1/CDK4 in enzymatic assays. Abemaciclib prevents retinoblastoma protein (Rb) phosphorylation, blocking cell cycle progression from the G1 to the S-phase of cell division, leading to suppression of tumour growth. In oestrogen receptor-positive breast cancer cell lines, sustained target inhibition with abemaciclib prevented rebound of Rb phosphorylation resulting in cell senescence and apoptosis. In vitro, Rb-negative and Rb-depleted cancer cell lines are generally less sensitive to abemaciclib. In breast cancer xenograft models, abemaciclib dosed daily without interruption at clinically relevant concentrations alone or in combination with anti-oestrogens resulted in reduction of tumour size.
Pharmacodynamic effects: In cancer patients, abemaciclib inhibits CDK4 and CDK6 as indicated by inhibition of phosphorylation of Rb and topoisomerase II alpha, which results in cell cycle inhibition upstream of the G1 restriction point.
Cardiac electrophysiology: The effect of abemaciclib on the QTcF interval was evaluated in 144 patients with advanced cancer. No large change (that is, >20 ms) in the QTcF interval was detected at the mean observed maximal steady state abemaciclib concentration following a therapeutic dosing schedule.
In an exposure-response analysis in healthy subjects at exposures comparable to a 200 mg twice-daily dose, abemaciclib did not prolong the QTcF interval to any clinically relevant extent.
Clinical efficacy and safety: Randomised Phase 3 Study MONARCH 3: Verzenio in combination with aromatase inhibitors: The efficacy and safety of Verzenio in combination with an aromatase inhibitor (anastrozole or letrozole) was evaluated in MONARCH 3, a randomised, double-blind, placebo-controlled phase 3 study in women with HR positive, HER2 negative locally advanced or metastatic breast cancer who had not received prior systemic therapy in this disease setting. Patients were randomised in a 2:1 ratio to receive Verzenio 150 mg twice daily plus a non-steroidal aromatase inhibitor given daily at the recommended dose versus placebo plus a non-steroidal aromatase inhibitor according to the same schedule. The primary endpoint was investigator-assessed progression-free survival (PFS) evaluated according to RECIST 1.1; key secondary efficacy endpoints included objective response rate (ORR), clinical benefit rate (CBR) and overall survival (OS).
The median age of patients enrolled was 63 years (range 32-88). Approximately 39% of patients had received chemotherapy and 44% had received antihormonal therapy in the (neo)adjuvant setting. Patients with prior (neo)adjuvant endocrine therapy must have completed this therapy at least 12 months before study randomisation. The majority of patients (96%) had metastatic disease at baseline. Approximately 22% of patients had bone-only disease, and 53% patients had visceral metastases.
The study met its primary endpoint of improving PFS. Primary efficacy results are summarised in Table 1 and Figure 1. (See Table 1 and Figure 1.)

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Progression-free survival (PFS) was significantly prolonged in the Verzenio plus aromatase inhibitor (AI) arm, (Hazard Ratio [HR] of 0.540 [95% CI, 0.418 to 0.698]); median PFS was 28.18 months in the Verzenio plus AI arm and was 14.76 months in the placebo plus AI arm. These results correspond to a clinically meaningful reduction in the risk of disease progression or death of 46% for patients treated with abemaciclib plus an aromatase inhibitor.
Overall survival was not mature at the final PFS analysis (93 events observed across the two arms). The HR was 1.057 (95% CI: 0.683, 1.633), p=0.8017.
A series of prespecified subgroup PFS analyses showed consistent results across patient subgroups including age (<65 or ≥65 years), disease site, disease setting (de novo metastatic vs recurrent metastatic vs locally advanced recurrent), presence of measurable disease, progesterone receptor status, and baseline ECOG performance status. A reduction in the risk of disease progression or death was observed in patients with visceral disease, (HR of 0.567 [95% CI: 0.407, 0.789]), median PFS 21.6 months versus 14.0 months; in patients with bone-only disease (HR 0.565, [95% CI: 0.306, 1.044]); and in patients with measurable disease (HR 0.517, [95% CI: 0.392, 0.681]).
Randomised Phase 3 Study MONARCH 2: Verzenio in combination with fulvestrant: The efficacy and safety of Verzenio in combination with fulvestrant was evaluated in MONARCH 2, a randomised, double-blind, placebo-controlled phase 3 study in women with HR positive, HER2 negative locally advanced or metastatic breast cancer. Patients were randomised in a 2:1 ratio to receive Verzenio 150 mg twice daily plus fulvestrant 500 mg at intervals of one month, with an additional 500 mg dose given two weeks after the initial dose, versus placebo plus fulvestrant according to the same schedule. The primary endpoint was investigator-assessed PFS evaluated according to RECIST 1.1; key secondary efficacy endpoints included objective response rate (ORR), clinical benefit rate (CBR) and overall survival (OS).
The median age of patients enrolled was 60 years (range, 32-91 years). In each treatment arm the majority of patients were white, and had not received chemotherapy for metastatic disease. 17% of patients were pre/perimenopausal on ovarian suppression with a GnRH agonist. Approximately 56% patients had visceral metastases. Approximately 25% of patients had primary endocrine resistance (progression on endocrine therapy within the first 2 years of adjuvant endocrine therapy or within the first 6 months of first line endocrine therapy for metastatic breast cancer) and for the majority, endocrine resistance developed later. 59% of patients had most recent endocrine therapy in the (neo)adjuvant setting, and 38% in metastatic setting.
The study met its primary endpoint of improving PFS. Primary efficacy results are summarised in Table 2 and Figure 2. (See Table 2 and Figure 2.)

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Median PFS was significantly prolonged in the Verzenio plus fulvestrant arm (HR of 0.553 [95% CI 0.449, 0.681]); median PFS was 16.4 months versus 9.3 months in the placebo plus fulvestrant arm. These results correspond to a clinically meaningful reduction in the risk of disease progression or death of 44.7% and a 7.2 month improvement in median PFS for patients treated with Verzenio plus fulvestrant. Verzenio plus fulvestrant prolonged progression-free survival with neither a clinically meaningful or significant detriment to health-related quality of life.
A series of prespecified subgroup PFS analyses showed consistent results across patient subgroups including age (<65 or ≥65 years), race, geographic region, disease site, endocrine therapy resistance, presence of measurable disease, progesterone receptor status, and menopausal status. A reduction in the risk of disease progression or death was observed in patients with visceral disease, (HR of 0.481 [95% CI: 0.369, 0.627]), median PFS 14.7 months versus 6.5 months; in patients with bone-only disease (HR of 0.543 [95% CI: 0.355, 0.833]); patients with measurable disease (HR of 0.523 [95% CI: 0.412, 0.644]). In patients who were pre/perimenopausal, the hazard ratio was 0.415 (95% CI: 0.246, 0.698); in patients who were progesterone receptor negative, the HR was 0.509 (95% CI: 0.325, 0.797).
In a sub-population with locally advanced or metastatic disease that had not received prior endocrine therapy, the PFS was also consistent.
Overall survival (OS) analysis in the ITT population showed a statistically significant improvement in patients receiving Verzenio plus fulvestrant compared with those receiving placebo plus fulvestrant. The overall survival results are summarized in Table 3 and Figure 3. (See Table 3 and Figure 3.)

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Analyses for OS by stratification factors showed OS HR of 0.675 (95 % CI: 0.511, 0.891) in patients with visceral disease, and 0.686 (95 % CI: 0.451, 1.043) in patients with primary endocrine resistance.
Paediatric population: The European Medicines Agency has waived the obligation to submit the results of studies with Verzenio in all subsets of the paediatric population in breast cancer (see Dosage & Administration for information on paediatric use).
Pharmacokinetics: Absorption: Abemaciclib absorption is slow, with a T_max of 8 hours and a mean absolute bioavailability of approximately 45 %. In the therapeutic dose range of 50-200 mg, the increase in plasma exposure (AUC) and C_max is approximately dose proportional. Steady state was achieved within 5 days following repeated twice daily dosing, and abemaciclib accumulated with a geometric mean accumulation ratio of 3.7 (58% CV) and 5.8 (65% CV) based on C_max and AUC, respectively. A high-fat meal increased combined AUC of abemaciclib and its active metabolites by 9% and increased C_max by 26%. These changes were not considered to be clinically relevant. Therefore, abemaciclib can be taken with or without food.
Distribution: Abemaciclib is highly bound to plasma proteins in humans (mean bound fraction approximately 96% to 98%). The geometric mean systemic volume of distribution is approximately 750 L (69% CV), indicating distribution of abemaciclib into tissues.
Concentrations of abemaciclib and its active metabolites in cerebrospinal fluid are comparable to unbound plasma concentrations.
Biotransformation: Hepatic metabolism is the main route of clearance for abemaciclib. Abemaciclib is metabolised to several metabolites primarily by cytochrome P450 (CYP) 3A4. The primary biotransformation is hydroxylation to a metabolite that circulates with an AUC that is 77% of parent drug. In addition, N-desethyl and N-desethylhydroxy metabolites circulate at AUCs that are 39% and 15% of parent drug. These circulating metabolites are active with similar potency to abemaciclib.
Elimination: The geometric mean hepatic clearance (CL) of abemaciclib was 21.8 L/h (39.8% CV), and the mean plasma elimination half-life for abemaciclib in patients was 24.8 hours (52.1% CV). After a single oral dose of [¹⁴C] -abemaciclib, approximately 81% of the dose was excreted in faeces and 3.4% excreted in urine. The majority of the dose eliminated in faeces was metabolites.
Special populations: Age, gender, and body weight: Age, gender, and body weight had no effect on the exposure of abemaciclib in a population pharmacokinetic analysis in patients with cancer (135 males and 859 females; age range 24-91 years; and body weight range 36-175 kg).
Hepatic impairment: Abemaciclib is metabolised in the liver. Mild (Child Pugh A) and moderate (Child Pugh B) hepatic impairment had no effect on the exposure of abemaciclib. In subjects with severe hepatic impairment (Child Pugh C), the AUC_0-∞ of abemaciclib and potency adjusted unbound abemaciclib plus its active metabolites increased 2.1-fold and 2.4-fold, respectively. The half-life of abemaciclib increased from 24 to 55 hours (see Dosage & Administration).
Renal impairment: Renal clearance of abemaciclib and its metabolites is minor. Mild and moderate renal impairment had no effect on the exposure of abemaciclib. There are no data in patients with severe renal impairment, end stage renal disease or in patients on dialysis.
Toxicology: Preclinical safety data: The primary target organ findings of potential relevance to humans included gastrointestinal and haematolymphopoietic organ effects in rats and dogs in studies up to 13 weeks duration. Effects in lung and skeletal muscle occurred only in rats at exposure levels approximately 2-fold higher than human exposure levels and effects in kidney occurred only in rats at exposure levels approximately 6-fold higher than human exposure levels. Complete or partial recovery was observed for all target organs at the end of the 28-day recovery period.
Genotoxicity: Abemaciclib was not mutagenic in a bacterial reverse mutation (Ames) assay, was not clastogenic in an in vitro chromosomal aberration assay in human peripheral blood lymphocytes, and was not clastogenic in an in vivo rat bone marrow micronucleus assay.
Carcinogenicity: Specific animal studies to test abemaciclib for carcinogenic potential have not been performed.
Developmental toxicity: Abemaciclib was teratogenic and caused decreased foetal weight at maternal exposures similar to the recommended human dose.

Verzenio is indicated for the treatment of women with hormone receptor (HR) positive, human epidermal growth factor receptor 2 (HER2) negative locally advanced or metastatic breast cancer in combination with an aromatase inhibitor or fulvestrant as initial endocrine-based therapy, or in women who have received prior endocrine therapy.
In pre- or perimenopausal women, the endocrine therapy should be combined with a luteinising hormone-releasing hormone (LHRH) agonist.

Verzenio therapy should be initiated and supervised by physicians experienced in the use of anti-cancer therapies.
Posology: Verzenio in combination with endocrine therapy: The recommended dose of abemaciclib is 150 mg twice daily when used in combination with endocrine therapy. Please refer to the Summary of Product Characteristics of the endocrine therapy combination partner for the recommended posology.
Verzenio should be taken continuously as long as the patient is deriving clinical benefit from therapy or until unacceptable toxicity occurs.
If a patient vomits or misses a dose of Verzenio, the patient should be instructed to take the next dose at its scheduled time; an additional dose should not be taken.
Dose adjustments: Management of some adverse reactions may require dose interruption and/or dose reduction as shown in Tables 4-9. (See Table 4.)

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Complete blood counts should be monitored prior to the start of Verzenio therapy, every two weeks for the first two months, monthly for the next two months, and as clinically indicated. Before treatment initiation, absolute neutrophil counts (ANC) ≥1500/mm³, platelets ≥100,000/mm³, and haemoglobin ≥8 g/dL are recommended. (See Table 5.)

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Treatment with antidiarrhoeal agents, such as loperamide, should be started at the first sign of loose stools. (See Table 6.)

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Alanine aminotransferase (ALT) and aspartate aminostransferase (AST) should be monitored prior to the start of Verzenio therapy, every two weeks for the first two months, monthly for the next two months, and as clinically indicated. (See Tables 7, 8 and 9.)

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CYP3A4 inhibitors: Concomitant use of strong CYP3A4 inhibitors should be avoided. If strong CYP3A4 inhibitors cannot be avoided, the abemaciclib dose should be reduced to 100 mg twice daily.
In patients who have had their dose reduced to 100 mg abemaciclib twice daily and in whom co-administration of a strong CYP3A4 inhibitor cannot be avoided, the abemaciclib dose should be further reduced to 50 mg twice daily.
In patients who have had their dose reduced to 50 mg abemaciclib twice daily and in whom co-administration of a strong CYP3A4 inhibitor cannot be avoided, the abemaciclib dose may be continued with close monitoring of signs of toxicity. Alternatively, the abemaciclib dose may be reduced to 50 mg once daily or discontinued.
If the CYP3A4 inhibitor is discontinued, the abemaciclib dose should be increased to the dose used prior to the initiation of the CYP3A4 inhibitor (after 3 to 5 half-lives of the CYP3A4 inhibitor).
Special populations: Elderly: No dose adjustment is required based on age (see Pharmacology: Pharmacokinetics under Actions).
Renal impairment: No dose adjustments are necessary in patients with mild or moderate renal impairment. There are no data regarding abemaciclib administration in patients with severe renal impairment, end stage renal disease, or in patients on dialysis (see Pharmacology: Pharmacokinetics under Actions). Abemaciclib should be administered with caution in patients with severe renal impairment, with close monitoring for signs of toxicity.
Hepatic impairment: No dose adjustments are necessary in patients with mild (Child Pugh A) or moderate (Child Pugh B) hepatic impairment. In patients with severe (Child Pugh C) hepatic impairment, a decrease in dosing frequency to once daily is recommended (see Pharmacology: Pharmacokinetics under Actions).
Paediatric population: The safety and efficacy of abemaciclib in children and adolescents aged less than 18 years has not been established.
No data are available.
Method of administration: Verzenio is for oral use.
The dose can be taken with or without food. It should not be taken with grapefruit or grapefruit juice (see Interactions).
Patients should take the doses at approximately the same times every day.
The tablet should be swallowed whole (patients should not chew, crush, or split tablets before swallowing).

In the event of an abemaciclib overdose, fatigue and diarrhoea may occur. General supportive care should be provided.

Hypersensitivity to the active substance or to any of the excipients listed in Description.

Neutropenia: Neutropenia was reported in patients receiving abemaciclib. Dose modification is recommended for patients who develop Grade 3 or 4 neutropenia (see Dosage & Administration). Fatal events occurred in <1% of patients. Patients should be instructed to report any episode of fever to their healthcare provider.
Infections/infestations: Infections were reported in patients receiving abemaciclib plus endocrine therapy at a higher rate than in patients treated with placebo plus endocrine therapy. Lung infection was reported in patients receiving abemaciclib without concurrent neutropenia. Fatal events occurred in <1% of patients. Patients should be monitored for signs and symptoms of infection and treated as medically appropriate.
Venous thromboembolism: Venous thromboembolic events were reported in 5.3% of patients treated with abemaciclib plus fulvestrant or aromatase inhibitors, compared to 0.8% of patients treated with placebo plus fulvestrant or aromatase inhibitors. Patients should be monitored for signs and symptoms of deep vein thrombosis and pulmonary embolism and treated as medically appropriate.
Increased aminotransferases: Increases in ALT and AST were reported in patients receiving abemaciclib. Based on the level of ALT or AST elevation, abemaciclib may require dose modification (see Dosage & Administration).
Diarrhoea: Diarrhoea is the most common adverse reaction. Across clinical studies, median time to onset of the first diarrhoea event was approximately 6 to 8 days, and median duration of diarrhoea was 9 to 12 days (Grade 2) and 6 to 8 days (Grade 3). Diarrhoea can be associated with dehydration. Patients should start treatment with antidiarrhoeal agents such as loperamide at the first sign of loose stools, increase oral fluids and notify their healthcare provider. Dose modification is recommended for patients who develop ≥ Grade 2 diarrhoea (see Dosage & Administration).
Interstitial Lung Disease (ILD)/Pneumonitis: Interstitial lung disease (ILD)/pneumonitis was reported in patients receiving abemaciclib. Monitor patients for pulmonary symptoms indicative of ILD/pneumonitis and treat as medically appropriate. Based on the grade of ILD/pneumonitis, abemaciclib may require dose modification (see Dosage & Administration). Permanently discontinue abemaciclib in patients with Grade 3 or 4 ILD/pneumonitis.
Concomitant use of inducers of CYP3A4: Concomitant use of CYP3A4 inducers should be avoided due to the risk of decreased efficacy of abemaciclib (see Interactions).
Visceral crisis: There are no data on the efficacy and safety of abemaciclib in patients with visceral crisis.
Lactose: Patients with rare hereditary problems of galactose intolerance, total lactase deficiency or glucose-galactose malabsorption should not take this medicine.
Sodium: This medicinal product contains less than 1 mmol sodium (23 mg) per tablet, that is to say essentially "sodium-free".
Effects on ability to drive and use machines: Verzenio has minor influence on the ability to drive and use machines. Patients should be advised to be cautious when driving or using machines in case they experience fatigue or dizziness during treatment with Verzenio (see Adverse Reactions).

Women of childbearing potential/Contraception in females: Women of childbearing potential should use highly effective contraception methods (e.g. double-barrier contraception) during treatment and for at least 3 weeks after completing therapy (see Interactions).
Pregnancy: There are no data from the use of abemaciclib in pregnant women. Studies in animals have shown reproductive toxicity (see Pharmacology: Toxicology: Preclinical safety data under Actions). Verzenio is not recommended during pregnancy and in women of child-bearing potential not using contraception.
Breast-feeding: It is unknown whether abemaciclib is excreted in human milk. A risk to newborns/infants cannot be excluded. Patients receiving abemaciclib should not breast-feed.
Fertility: The effect of abemaciclib on fertility in humans is unknown. In animal studies, no effects on female reproductive organs were observed. However, cytotoxic effects to the male reproductive tract in rats and dogs indicate that abemaciclib may impair fertility in males (see Pharmacology: Toxicology: Preclinical safety data under Actions).

Summary of the safety profile: The most commonly occurring adverse reactions are diarrhoea, infections, neutropenia, anaemia, fatigue, nausea, vomiting and decreased appetite.
Tabulated list of adverse reactions: In the following table, adverse reactions are listed in order of MedDRA body system organ class and frequency. Frequency gradings are: 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), and not known (cannot be estimated from the available data). Within each frequency grouping, adverse reactions are presented in order of decreasing seriousness. (See Table 10.)

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Description of selected adverse reactions: Neutropenia: Neutropenia was reported frequently (45.1%) and a Grade 3 or 4 decrease in neutrophil counts (based on laboratory findings) was reported in 28.2% of patients receiving abemaciclib in combination with aromatase inhibitors or fulvestrant. The median time to onset of Grade 3 or 4 neutropenia was 29 to 33 days, and median time to resolution was 11 to 15 days. Febrile neutropenia was reported in 0.9% patients. Dose modification is recommended for patients who develop Grade 3 or 4 neutropenia (see Dosage & Administration).
Diarrhoea: Diarrhoea was the most commonly reported adverse reaction (see Table 10). Incidence was greatest during the first month of abemaciclib treatment and was lower subsequently. The median time to onset of the first diarrhoea event was approximately 6 to 8 days across studies, and the median duration of diarrhoea was 9 to 12 days (Grade 2) and 6 to 8 days (Grade 3) across studies. Diarrhoea returned to baseline or lesser grade with supportive treatment such as loperamide and/or dose adjustment (see Dosage & Administration).
Increased aminotransferases: In patients receiving abemaciclib in combination with aromatase inhibitors or fulvestrant, ALT and AST elevations were reported frequently (15.1% and 14.2%, respectively). Grade 3 or 4 ALT or AST elevations (based on laboratory findings) were reported in 6.1% and 4.2% patients. The median time to onset of Grade 3 or 4 ALT elevation was 57 to 61 days, and median time to resolution was 14 days. The median time to onset of Grade 3 or 4 AST elevation was 71 to 185 days, and median time to resolution was 13 to 15 days. Dose modification is recommended for patients who develop Grade 3 or 4 ALT or AST increase (see Dosage & Administration).
Creatinine: Although not an adverse reaction, abemaciclib has been shown to increase serum creatinine in 98.3% of patients (based on laboratory findings), 1.9% Grade 3 or 4 (based on laboratory findings). In patients receiving an aromatase inhibitor or fulvestrant alone, 78.4% reported an increase in serum creatinine (all laboratory grades). Abemaciclib has been shown to increase serum creatinine due to inhibition of renal tubular secretion transporters without affecting glomerular function (as measured by iohexol clearance) (see Interactions). In clinical studies, increases in serum creatinine occurred within the first month of abemaciclib dosing, remained elevated but stable through the treatment period, were reversible upon treatment discontinuation, and were not accompanied by changes in markers of renal function, such as blood urea nitrogen (BUN), cystatin C, or calculated glomerular filtration rate based on cystatin C.
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 to the Drug Office, Department of Health.

Effects of other medicinal products on the pharmacokinetics of abemaciclib: Abemaciclib is primarily metabolised by CYP3A4.
CYP3A4 inhibitors: Co-administration of abemaciclib with CYP3A4 inhibitors can increase plasma concentrations of abemaciclib. In patients with advanced and/or metastatic cancer, co-administration of the CYP3A4 inhibitor clarithromycin resulted in a 3.4-fold increase in the plasma exposure of abemaciclib and a 2.5-fold increase in the combined unbound potency adjusted plasma exposure of abemaciclib and its active metabolites.
Use of strong CYP3A4 inhibitors together with abemaciclib should be avoided. If strong CYP3A4 inhibitors need to be co-administered, the dose of abemaciclib should be reduced (see Dosage & Administration), followed by careful monitoring of toxicity. Examples of strong CYP3A4 inhibitors include, but not limited to: clarithromycin, itraconazole, ketoconazole, lopinavir/ritonavir, posaconazole or voriconazole. Avoid grapefruit or grapefruit juice.
No dose adjustment is necessary for patients treated with moderate or weak CYP3A4 inhibitors. There should, however, be close monitoring for signs of toxicity.
CYP3A4 inducers: Co-administration of abemaciclib with the strong CYP3A4 inducer rifampicin decreased the plasma concentration of abemaciclib by 95% and unbound potency adjusted plasma concentration of abemaciclib plus its active metabolites by 77% based on AUC_0-∞. Concomitant use of strong CYP3A4 inducers (including, but not limited to: carbamazepine, phenytoin, rifampicin and St. John's wort) should be avoided due to the risk of decreased efficacy of abemaciclib.
Effects of abemaciclib on the pharmacokinetics of other medicinal products: Medicinal products that are substrates of transporters: Abemaciclib and its major active metabolites inhibit the renal transporters organic cation transporter 2 (OCT2), multidrug and extrusion toxin protein (MATE1), and MATE2-K. In vivo interactions of abemaciclib with clinically relevant substrates of these transporters, such as dofetilide or creatinine, may occur (see Adverse Reactions). In a clinical drug interaction study with metformin (substrate of OCT2, MATE1 and 2) co-administered with 400 mg abemaciclib, a small but not clinically relevant increase (37%) in metformin plasma exposure was observed. This was found to be due to reduced renal secretion with unaffected glomerular filtration.
In healthy subjects, co-administration of abemaciclib and the P-glycoprotein (P-gp) substrate loperamide resulted in an increase in loperamide plasma exposure of 9% based on AUC_0-∞ and 35% based on C_max. This was not considered to be clinically relevant. However, based on the in vitro inhibition of P-gp and breast cancer resistance protein (BCRP) observed with abemaciclib, in vivo interactions of abemaciclib with narrow therapeutic index substrates of these transporters, such as digoxin or dabigatran etexilate, may occur.
In a clinical study in patients with breast cancer, there was no clinically-relevant pharmacokinetic drug interaction between abemaciclib and anastrozole, fulvestrant, exemestane, letrozole or tamoxifen.
It is currently unknown whether abemaciclib may reduce the effectiveness of systemically acting hormonal contraceptives.

Special precautions for disposal: Any unused medicinal product or waste material should be disposed of in accordance with local requirements.
Incompatibilities: Not applicable.

Store below 30°C.
Shelf life: The shelf life is 36 months.

Targeted Cancer Therapy

L01EF03 - abemaciclib ; Belongs to the class of cyclin-dependent kinase (CDK) inhibitors. Used in the treatment of cancer.

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