2.1 Recommended Dosage

The recommended dosage of TURALIO is 250 mg taken orally twice daily with a low-fat meal (approximately 11 to 14 grams of total fat) until disease progression or unacceptable toxicity [see Clinical Pharmacology (12.3)]. Taking TURALIO with a high-fat meal (approximately 55 to 65 grams of total fat) increases pexidartinib concentrations and may increase the risk of adverse reactions, including hepatotoxicity [see Warnings and Precautions (5.1, 5.4), Drug Interactions (7.2), Clinical Pharmacology (12.2, 12.3)].

Swallow TURALIO capsules whole. Do not open, break, or chew the capsules.

If a patient vomits or misses a dose of TURALIO, instruct the patient to take the next dose at its scheduled time.

2.2 Dosage Modifications for Adverse Reactions

The recommended dose reductions for adverse reactions are provided in Table 1.

Permanently discontinue TURALIO in patients who are unable to tolerate 125 mg orally twice daily.

The recommended dosage modifications for adverse reactions are summarized in Table 2.

2.3 Concomitant Use of Moderate or Strong CYP3A Inhibitors or UGT Inhibitors

Avoid concomitant use of TURALIO with moderate or strong CYP3A inhibitors or UGT inhibitors during treatment with TURALIO. If concomitant use with a moderate or strong CYP3A inhibitor or UGT inhibitor cannot be avoided, reduce the TURALIO dose according to the recommendations in Table 3.

If concomitant use of a moderate or strong CYP3A inhibitor or UGT inhibitor is discontinued, increase the TURALIO dose (after 3 plasma half-lives of the moderate or strong CYP3A inhibitor or UGT inhibitor) to the dose that was used before starting the inhibitor [see Clinical Pharmacology (12.3)].

2.4 Concomitant Use of Acid-Reducing Agents

Avoid the concomitant use of proton pump inhibitors (PPI) while taking TURALIO. As an alternative to a PPI, administer TURALIO 2 hours before or 2 hours after taking a locally-acting antacid, or if using a histamine 2 (H2)-receptor antagonist, administer TURALIO at least 2 hours before or 10 hours after taking an H2-receptor antagonist [see Clinical Pharmacology (12.3)].

2.5 Dosage Modification for Renal Impairment

The recommended dosage of TURALIO for patients with mild to severe renal impairment (creatinine clearance [CLcr] 15 to 89 mL/min estimated by Cockcroft-Gault using actual body weight) is 125 mg in the morning and 250 mg in the evening with a low-fat meal [see Clinical Pharmacology (12.3)].

2.6 Dosage Modification for Hepatic Impairment

The recommended dosage of TURALIO for patients with moderate hepatic impairment (total bilirubin >1.5 to 3 × upper limit of normal (ULN), not due to Gilbert's syndrome, with any AST) is 125 mg twice daily with a low-fat meal [see Clinical Pharmacology (12.3)]. TURALIO has not been studied in patients with severe hepatic impairment (total bilirubin >3 to 10 × ULN and any AST).

5.1 Hepatotoxicity

TURALIO can cause serious and potentially fatal liver injury and is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) [see Warnings and Precautions (5.2)].

Hepatotoxicity, including liver failure and life-threatening vanishing bile duct syndrome (VBDS), ductopenia, and symptomatic cholestasis (including severe pruritus) can occur in patients treated with TURALIO and can occur despite monitoring and prompt drug cessation. The mechanism of cholestatic hepatotoxicity is unknown and its occurrence cannot be predicted. It is unknown whether liver injury can also occur in the absence of increased transaminases.

Of the first 609 patients who received TURALIO under the REMS program, 32 (5.3%) developed a liver injury event of concern (LIEC), defined as any serious liver-related outcome or any liver abnormality that triggers drug discontinuation per the US Prescribing Information [see Dosage and Administration (2.2)]. These 32 patients developed liver toxicity within 71 days of the first dose of TURALIO; ten required hospitalization, and two developed VBDS. Sixteen of the 32 patients had not fully recovered at the time of the analysis, including 6 patients followed for at least 6 months after discontinuation.

Among 768 patients who received TURALIO in clinical trials, there were two irreversible cases of cholestatic liver injury. One patient with advanced cancer and ongoing liver toxicity died and one patient with a confirmed case of VBDS required a liver transplant.

In ENLIVEN, 3 of 61 (5%) patients who received TURALIO developed signs of serious liver injury, defined as ALT or AST ≥3 × ULN with total bilirubin ≥2 × ULN. In these patients, peak ALT ranged from 6 to 9 × ULN, peak total bilirubin ranged from 2.5 to 15 × ULN, and alkaline phosphatase (ALP) was ≥2 × ULN. ALT, AST, and total bilirubin improved to <2 × ULN in these three patients 1 to 7 months after discontinuing TURALIO.

Avoid TURALIO in patients with pre-existing increased serum transaminases; total bilirubin or direct bilirubin (>ULN); or active liver or biliary tract disease, including increased ALP. Monitor liver tests, including AST, ALT, total bilirubin, direct bilirubin, ALP, and gamma-glutamyl transferase (GGT) prior to initiation of TURALIO, weekly for the first 8 weeks, every 2 weeks for the next month and every 3 months thereafter. Withhold and dose reduce, or permanently discontinue TURALIO based on the severity of the hepatotoxicity [see Dosage and Administration (2.2)]. Refer patients to a hepatologist if liver tests do not return to normal. Rechallenge with a reduced dose of TURALIO may result in a recurrence of increased serum transaminases, bilirubin, ALP., or other signs of liver injury. Monitor liver tests weekly for the first month after rechallenge.

5.2 TURALIO REMS Program

TURALIO is only available through a restricted program under a REMS, because of the risk of hepatotoxicity [see Warnings and Precautions (5.1)].

Notable requirements of the TURALIO REMS Program include the following:

• Prescribers must be certified with the program by enrolling and completing training.
• Patients must complete and sign an enrollment form for inclusion in a patient registry.
• Pharmacies must be certified with the program and must only dispense to patients who are authorized to receive TURALIO.

Further information is available at www.TURALIOREMS.com or 1-833-887-2546.

5.3 Embryo-Fetal Toxicity

Based on animal studies and its mechanism of action, TURALIO may cause fetal harm when administered to a pregnant woman. Oral administration of pexidartinib to pregnant rats and rabbits during the period of organogenesis resulted in malformations, increased post-implantation loss, and abortion at exposures approximately equal to the human exposure at the recommended dose based on area under the curve (AUC).

Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective non-hormonal contraception, since TURALIO can render hormonal contraceptives ineffective, during treatment with TURALIO and for 1 month after the final dose. Advise males with female partners of reproductive potential to use effective contraception during treatment with TURALIO and for 1 week after the final dose [see Drug Interactions (7.3), Use in Specific Populations (8.1, 8.3)].

5.4 Potential Risks Associated with a High-Fat Meal

Taking TURALIO with a high-fat meal increases pexidartinib concentrations, which may increase the incidence and severity of adverse reactions, including hepatotoxicity [see Clinical Pharmacology (12.2, 12.3)].

Instruct patients to take TURALIO with a low-fat meal (approximately 11 to 14 grams of total fat) and to avoid taking TURALIO with a high-fat meal (approximately 55 to 65 grams of total fat). Consider referring patients to a dietician as deemed necessary [see Dosage and Administration (2.1), Warnings and Precautions (5.1), Drug Interactions (7.2)].

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

The safety of TURALIO 250 mg orally twice daily administered with a low-fat meal has been established based on adequate and well-controlled studies of TURALIO 400 mg orally twice daily administered on an empty stomach and additional pharmacokinetic data that indicate there is no clinically significant difference in the relative exposure between the two dosages [see Clinical Pharmacology (12.3)].

The safety of TURALIO was evaluated in ENLIVEN [see Clinical Studies (14.1)]. ENLIVEN excluded patients with ALT, AST, or total bilirubin >1.5 × ULN; and known active or chronic infection with hepatitis B or C virus, or human immunodeficiency virus. Patients received TURALIO without food at a dose of 400 mg in the morning and 600 mg in the evening orally for 2 weeks followed by 400 mg orally twice daily until disease progression or unacceptable toxicity. Seventy-nine percent of patients received TURALIO for 6 months or longer and 66% for greater than one year.

The median age of TURALIO-treated patients was 44 years (range: 22-75), 57% were females, and 85% were White.

Serious adverse reactions were reported in 13% of patients who received TURALIO. Most frequent (occurring in >1 patient) serious adverse reactions included abnormal liver tests (3.3%) and hepatotoxicity (3.3%).

Permanent discontinuation due to an adverse reaction occurred in 13% of patients who received TURALIO. Most frequent adverse reactions (occurring in >1 patient) requiring permanent discontinuation included increased ALT (4.9%), increased AST (4.9%) and hepatotoxicity (3.3%).

Dose reductions or interruptions occurred in 38% of patients who received TURALIO. Most frequent adverse reactions (occurring in >1 patient) requiring a dosage reduction or interruption were increased ALT (13%), increased AST (13%), nausea (8%), increased ALP (7%), vomiting (4.9%), increased bilirubin (3.3%), increased GGT (3.3%), dizziness (3.3%), and abdominal pain (3.3%).

The most common (>20%) adverse reactions, including laboratory abnormalities, in patients who received TURALIO were: increased lactate dehydrogenase (LDH), increased AST, hair color changes, fatigue, increased ALT, decreased neutrophils, increased cholesterol, increased ALP, decreased lymphocytes, eye edema, decreased hemoglobin, rash, dysgeusia, and decreased phosphate.

Tables 4, 5, and 6 summarize the adverse reactions and laboratory abnormalities in ENLIVEN during the randomized phase (Week 25).

Clinically relevant adverse reactions occurring in <10% of patients were:

Eye: blurred vision, photophobia, diplopia, reduced visual acuity

Gastrointestinal: dry mouth, stomatitis, mouth ulceration

General: pyrexia

Hepatobiliary: cholangitis, hepatotoxicity, liver disorder

Neurological: cognitive disorders (memory impairment, amnesia, confusional state, disturbance in attention, attention deficit/hyperactivity disorder)

Skin and subcutaneous tissue: alopecia, skin pigment changes (hypopigmentation, depigmentation, discoloration, hyperpigmentation), photosensitivity reactions.

6.2 Postmarketing Experience

The following adverse reactions have been identified during post-approval use of TURALIO. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Investigations: Blood creatine phosphokinase increased

7.1 Use with Hepatotoxic Products

TURALIO can cause hepatotoxicity. In patients with increased serum transaminases, total bilirubin, or direct bilirubin (>ULN) or active liver or biliary tract disease, avoid coadministration of TURALIO with other products known to cause hepatotoxicity [see Warnings and Precautions (5.1)].

7.2 Effect of Other Drugs or Food on TURALIO

7.3 Effect of TURALIO on Other Drugs

8.1 Pregnancy

8.2 Lactation

8.3 Females and Males of Reproductive Potential

TURALIO may cause fetal harm when administered to a pregnant woman [see Use in Specific Populations (8.1)].

8.4 Pediatric Use

The safety and effectiveness of TURALIO in pediatric patients have not been established.

8.5 Geriatric Use

Clinical studies of TURALIO did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects.

8.6 Renal Impairment

Reduce the dosage when administering TURALIO to patients with mild to severe renal impairment (CLcr 15 to 89 mL/min, estimated by Cockcroft-Gault [C-G]) [see Dosage and Administration (2.5), Clinical Pharmacology (12.3)].

8.7 Hepatic Impairment

No dosage adjustment is recommended for patients with mild hepatic impairment (total bilirubin ≤ upper limit of normal [ULN] with AST > ULN or total bilirubin >1 to 1.5 × ULN with any AST) [see Clinical Pharmacology (12.3)].

Reduce the dosage of TURALIO for patients with moderate hepatic impairment (total bilirubin >1.5 to 3 × ULN, not due to Gilbert's syndrome, with any AST) [see Dosage and Administration (2.6), Clinical Pharmacology (12.3)].

TURALIO has not been studied in patients with severe hepatic impairment (total bilirubin >3 to 10 × ULN and any AST).

12.1 Mechanism of Action

Pexidartinib is a small molecule tyrosine kinase inhibitor that targets colony stimulating factor 1 receptor (CSF1R), KIT proto-oncogene receptor tyrosine kinase (KIT), and FMS-like tyrosine kinase 3 (FLT3) harboring an internal tandem duplication (ITD) mutation. Overexpression of the CSF1R ligand promotes cell proliferation and accumulation in the synovium. In vitro, pexidartinib inhibited proliferation of cell lines dependent on CSF1R and ligand-induced autophosphorylation of CSF1R. Pexidartinib also inhibited the proliferation of a CSF1R dependent cell line in vivo.

12.2 Pharmacodynamics

12.3 Pharmacokinetics

The pharmacokinetics of TURALIO was evaluated following single doses in healthy subjects and following multiple doses in patients as summarized in Table 9.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenicity studies were performed in mice and rats. Both studies were negative for carcinogenic findings at exposures up to 9 times the human exposure at the recommended daily dose based on AUC.

Pexidartinib was not mutagenic in an in vitro bacterial reverse mutation (AMES) assay or clastogenic in either an in vitro human peripheral blood lymphocyte chromosomal aberrations assay or in an in vivo mouse bone marrow micronucleus assay.

Based on nonclinical findings, TURALIO may impair male and female fertility. In a fertility study in which pexidartinib was administered orally to male and female rats, there were reductions in pregnancy, as well as increases in pre- and post-implantation loss with a corresponding reduction in viable embryos at 40 mg/kg (approximately 1.3 times the human exposure at the recommended dose). Males at this dose level displayed reductions in spermatogenic parameters and adverse effects on sperm concentration, production, motility, and morphology. Lower testicular and epididymal weights occurred in this study at doses of ≥10 mg/kg/day (approximately 0.3 times the human exposure at the recommended dose). This is consistent with findings in chronic toxicology studies of germ cell depletion of the testes and hypospermia and cellular debris in the epididymis in male reproductive tissues of both rats and dogs at respective doses as low as 20 and 30 mg/kg/day (approximately 0.6 and 0.1 times the human exposure at the recommended dose). In rats, these changes persisted following a 16-week recovery period at the 60 mg/kg/day dose level (approximately 1.5 times the human exposure at the recommended dose).

In female rats, necrosis of corpora lutea occurred at doses ≥0.5 mg/kg/day (approximately 0.01 times the human exposure at the recommended dose) with pigment deposition within the interstitium of the ovaries, an increased incidence of luteal cysts and incidence/severity of hemorrhage of corpora lutea, and a decreased incidence of retained antral follicles and decreased corpora lutea at 60 mg/kg (approximately 1.8 times the human exposure at the recommended dose). In female dogs there were decreased follicle numbers and moderate atrophy of the oviduct, uterus, and cervix at doses as low as 1 mg/kg (approximately 0.01 times the human exposure at the recommended dose).

13.2 Animal Toxicology and/or Pharmacology

In repeat dose toxicity studies of up to 26 weeks in rats, there were findings of myxomatous change in the skin, tongue, and gastrointestinal tract, lymphoid depletion of the bone marrow and thymus, and chronic progressive nephropathy of the kidney at 20 mg/kg/day (approximately 0.6 times the human exposure at the recommended dose). Similar changes occurred in the rat carcinogenicity study along with alterations in the tunica intima of the aorta. Vascular inflammation consistent with polyarteritis nodosa occurred in male rats at 60 mg/kg/day (approximately 1.5 times the human exposure at the recommended dose). There were also dose-dependent findings of minimal to moderate subphyseal or cortical hyperostosis and physeal hypertrophy in the femur that correlated with decreased systemic phosphate levels at doses ≥ 60 mg/kg.

14.1 Tenosynovial Giant Cell Tumor

The efficacy of TURALIO 250 mg orally twice daily administered with a low-fat meal has been established based on adequate and well-controlled studies of TURALIO 400 mg orally twice daily administered on an empty stomach and additional pharmacokinetic data that indicate there is no clinically significant difference in the relative exposure between the two dosages.

The efficacy of TURALIO was evaluated in ENLIVEN (NCT02371369), a double-blind, randomized (1:1), placebo-controlled, multicenter trial in patients with symptomatic TGCT [also referred to as giant cell tumor of the tendon sheath (GCT-TS) or pigmented villonodular synovitis (PVNS)] for whom surgical removal of the tumor would be associated with worsening functional limitation or severe morbidity. Eligible patients were required to have measurable disease per the Response Evaluation Criteria in Solid Tumors (RECIST) v1.1. Patients were randomized to placebo or TURALIO administered on an empty stomach: 400 mg in the morning and 600 mg in the evening for 2 weeks followed by 400 mg twice daily until unacceptable toxicity or disease progression. Randomization was stratified by geographic region (US vs. non-US countries) and disease location (upper extremity vs. lower extremity involvement). Patients who completed treatment in the double-blind, randomized part of the trial were eligible to advance to an open-label extension part in which all patients were given the option to receive pexidartinib.

The major efficacy outcome measure was overall response rate (ORR) as assessed by blinded independent central review (BICR) at Week 25 using RECIST v1.1. Additional efficacy outcome measures were mean change from baseline in range of motion of the affected joint at Week 25 and ORR as assessed by BICR at Week 25 using tumor volume score (TVS). Range of motion was measured as a percent of normal reference range for the affected joint. Range of motion assessments were performed by a third-party clinical assessor using a goniometer. TVS was defined in ENLIVEN as the estimated volume of the maximally distended synovial cavity or tendon sheath involved, measured in 10% increments. Patients in the placebo arm were offered TURALIO at Week 25 beginning with a 400 mg twice daily dose, as permitted by the study protocol.

A total of 120 patients were randomized, 61 to the TURALIO arm and 59 to the placebo arm. The median age was 44 years (range: 18-79); 59% were females; 88% were White; 53% had prior surgery; 88% were diagnosed with diffuse TGCT; and 9% had previously been treated with systemic therapy. Disease locations were knee (61%), ankle (18%), hip (11%), wrist (3%), foot (3%) and other (5%).

ENLIVEN demonstrated a statistically significant improvement in ORR in patients randomized to TURALIO compared with placebo. Efficacy results are summarized in Table 10.

The analysis of mean change from baseline in range of motion at Week 25 demonstrated a statistically significant improvement in patients randomized to TURALIO compared to placebo. Figure 1 shows the change from baseline in range of motion for each patient at Week 25 (TURALIO N=45, placebo N=43). Results were excluded for 1 patient with missing baseline and 31 patients with a missing range of motion assessment at Week 25.

ORR by TVS was 56% (95% CI: 43%, 67%) in patients randomized to the TURALIO arm and 0% in patients randomized to the placebo arm; p < 0.0001.

At completion of the open-label extension part of the study in which all patients received TURALIO, the ORR using RECIST v1.1 was 61% (95% CI: 48%, 72%) in the 61 patients originally randomized to the TURALIO arm. The median duration of response was not reached (range: 4.6+, 63.4+ months) in the 37 responders.

Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature].

Keep containers closed and do not remove desiccant from bottles.

Hepatotoxicity

Advise patients of the risk of hepatotoxicity that could be fatal and that they will need to undergo monitoring for liver injury. Advise patients to immediately report any signs or symptoms of severe liver injury to their healthcare provider and that liver testing and prompt cessation of TURALIO may not eliminate the risk of severe or life-threatening liver injury [see Warnings and Precautions (5.1)].

TURALIO REMS Program

• TURALIO is available only through a restricted program called TURALIO REMS Program and patients are required to be part of the patient registry [see Warnings and Precautions (5.2)].
• TURALIO is available only from certified pharmacies participating in the program. Therefore, provide patients with the telephone number and website for information on how to obtain the product.

Embryo-Fetal Toxicity

• Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Advise females of reproductive potential to inform their healthcare provider of a known or suspected pregnancy [see Warnings and Precautions (5.3), Use in Specific Populations (8.1, 8.3)].
• Advise females of reproductive potential to use effective non-hormonal contraception during treatment with TURALIO and for 1 month after the final dose [see Drug Interactions (7.3), Use in Specific Populations (8.3)].
• Advise male patients with female partners of reproductive potential to use effective contraception during treatment and for 1 week after the final dose [see Use in Specific Populations (8.3), Nonclinical Toxicology (13.1)].

Lactation

Advise females not to breastfeed during treatment with TURALIO and for 1 week after the final dose [see Use in Specific Populations (8.2)].

Infertility

Advise females and males of reproductive potential that TURALIO may impair fertility [see Use in Specific Populations (8.3), Nonclinical Toxicology (13.1)].

Administration

• Instruct patients to take TURALIO with a low-fat meal (approximately 11 to 14 grams of total fat) and to avoid taking TURALIO with a high-fat meal (approximately 55 to 65 grams of total fat). Consider referring patients to a dietician as deemed necessary [see Dosage and Administration (2.1), Warnings and Precautions (5.4), Drug Interactions (7.2)].
• Instruct patients to swallow capsules whole (do not open, break, or chew) [see Dosage and Administration (2.1)].

Drug Interactions

Advise patients to inform their healthcare providers of all concomitant products, including over-the-counter products and supplements [see Dosage and Administration (2), Drug Interactions (7)].

Photosensitivity

Inform patients of the signs and symptoms of photosensitivity. Advise patients to avoid prolonged sun exposure and to use sunscreen and protective clothing during treatment with TURALIO [see Adverse Reactions (6.1)].