The oral dose of Oforta™ is different than the intravenous fludarabine phosphate dose.

The recommended adult dose of Oforta™ is 40 mg/m2 administered by mouth daily for five consecutive days. Each 5-day course of treatment should commence every 28 days. Dosage may be decreased or delayed based on evidence of hematologic or nonhematologic toxicity. Physicians should consider delaying or discontinuing the drug if neurotoxicity occurs. Oforta™ can be taken either on an empty stomach or with food. The tablets have to be swallowed whole with water; they should not be chewed or broken.

The following table provides guidance for determining the number of tablets of Oforta™ to be administered based on body surface area (BSA):

A number of clinical settings may predispose to increased toxicity from Oforta™. These include advanced age, renal insufficiency, and bone marrow impairment. Such patients should be monitored closely for excessive toxicity and the dose modified accordingly. The optimal duration of treatment has not been clearly established. It is recommended that three additional cycles of Oforta™ be administered following the achievement of a maximal response and then the drug should be discontinued.

2.2  Renal Impairment

• Reduce dose by 20% in patients with mild to moderate renal impairment (creatinine clearance 30 to 70 mL/min/1.73 m2). [See Warnings and Precautions (5.7)]

• Reduce dose by 50% in patients with severe renal impairment (creatinine clearance < 30 mL/min/1.73 m2). [See Warnings and Precautions (5.7)]

• 3  DOSAGE FORMS AND STRENGTHS

Dose-dependent neurotoxicity has been observed with fludarabine phosphate. Dose levels approximately 4 times greater (96 mg/m2/day for 5 days to 7 days) than the recommended intravenous dose (25 mg/m2/day for 5 days) were associated with a syndrome characterized by delayed blindness, coma and death. Symptoms appeared from 21 days to 60 days following the last dose. Thirteen of 36 patients (36.1%) who received fludarabine phosphate intravenously at high doses (≥ 96 mg/m2/day for 5 days to 7 days per course) developed severe neurotoxicity, while only one of 443 patients (0.2%) who received the drug intravenously at low doses (≤ 40 mg/m2/day for 5 days per course) developed toxicity. In the pivotal clinical study conducted with Oforta™ administered at 40 mg/m2, severe impairment of consciousness was reported in one patient. The effect of chronic administration of fludarabine phosphate on the central nervous system is unknown; however, patients have received the recommended dose for up to 15 courses of therapy. Physicians should consider delaying or discontinuing the drug if neurotoxicity occurs.

5.2  Bone Marrow Suppression

Severe bone marrow suppression, notably anemia, thrombocytopenia and neutropenia, has been reported in patients treated with fludarabine phosphate. In a study in adult solid tumor patients, the median time to nadir counts was 13 days (range, 3 days to 25 days) for granulocytes and 16 days (range, 2 days to 32 days) for platelets. Most patients had hematologic impairment at baseline either as a result of disease or as a result of prior myelosuppressive therapy. Cumulative myelosuppression may be seen. While chemotherapy-induced myelosuppression is often reversible, administration of Oforta™ requires careful hematologic monitoring.

Several instances of trilineage bone marrow hypoplasia or aplasia resulting in pancytopenia, sometimes resulting in death, have been reported in adult patients. The duration of clinically significant cytopenia in the reported cases has ranged from approximately 2 months to approximately 1 year. These episodes have occurred both in previously treated or untreated patients. One case of pancytopenia was reported in the pivotal clinical study conducted with Oforta™.

Instances of life-threatening and sometimes fatal autoimmune hemolytic anemia have been reported to occur after one or more cycles of treatment with fludarabine phosphate in patients with or without a previous history of autoimmune hemolytic anemia or a positive Coombs' test and who may or may not be in remission from their disease. Steroids may or may not be effective in controlling these hemolytic episodes. The majority of patients rechallenged with fludarabine phosphate developed a recurrence in the hemolytic process. The mechanism(s) which predispose patients to the development of this complication has not been identified. Patients undergoing treatment with Oforta™ should be evaluated and closely monitored for hemolysis.

5.3  Pulmonary Toxicity

A high incidence of fatal pulmonary toxicity was observed in a clinical investigation using fludarabine phosphate in combination with pentostatin (deoxycoformycin) for the treatment of refractory chronic lymphocytic leukemia (CLL) in adults. Therefore, the use of Oforta™ in combination with pentostatin is not recommended.

5.4  Infections

Of 133 adult patients with CLL who received intravenous fludarabine phosphate in two clinical trials, there were 29 fatalities during study. Approximately 50% of the fatalities were due to infection and 25% due to progressive disease. Of 183 adult patients with CLL that received Oforta™ in two clinical trials, there were 13 deaths. Approximately 50% of the deaths were due to progressive disease, while two patient deaths (15%) were attributed to infection. Monitor for signs and symptoms of infection.

5.5  Tumor Lysis Syndrome

Tumor lysis syndrome associated with fludarabine phosphate treatment has been reported in patients with CLL with large tumor burdens. Since Oforta™ can induce a response as early as the first week of treatment, precautions should be taken in those patients at risk of developing this complication.

5.6  Use of Transfusions

Transfusion-associated graft-versus-host disease has been observed rarely after transfusion of non-irradiated blood in fludarabine phosphate treated patients. Consideration should, therefore, be given to the use of irradiated blood products in those patients requiring transfusions while undergoing treatment with Oforta™.

5.7  Renal Impairment

Oforta™ must be administered cautiously in patients with renal impairment. Following dosing of the intravenous product, the total body clearance of 2-fluoro-ara-A has been shown to be directly correlated with creatinine clearance. Patients with mild to moderate impairment of renal function (creatinine clearance 30 to 70 mL/min/1.73 m2) should have their Oforta™ dose reduced by 20% and be monitored closely. Patients with severe impairment of renal function (creatinine clearance < 30 mL/min/1.73 m2) should have their Oforta™ dose reduced by 50% and be monitored closely.

5.8  Monitoring

• Hematologic and Nonhematologic Toxicity

  Oforta™ is an antineoplastic agent with potentially significant toxic side effects. Patients undergoing therapy should be closely observed for signs of hematologic and nonhematologic toxicity. Periodic assessment of peripheral blood counts is recommended to detect the development of anemia, neutropenia and thrombocytopenia.

• Hematopoietic Suppression

  During treatment, the patient's hematologic profile (particularly neutrophils and platelets) should be monitored regularly to determine the degree of hematopoietic suppression.

• Infections

  Patients treated with Oforta™ appear to be at an increased risk of infection. Monitor for signs and symptoms of infection.

• 5.9  Pregnancy

Based on its mechanism of action, Oforta™ can cause fetal harm when administered to a pregnant woman. Fludarabine phosphate administered to rats and rabbits during organogenesis caused an increase in resorptions, skeletal and visceral malformation, and decreased fetal body weights. If Oforta™ is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be apprised of the potential hazard to the fetus. Women of childbearing potential should be advised to avoid becoming pregnant. Women of childbearing potential and fertile males must take contraceptive measures during and at least for 6 months after the cessation of therapy.

[see Use in Specific Populations (8.1) ].

6  ADVERSE REACTIONS

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 data described below reflect exposure to Oforta™ in 159 patients exposed to the drug. Oforta™ was studied primarily in Study 1 in 78 patients with CLL who received prior therapy and in Study 2 in 81 patients with CLL who had not received prior therapy.

Based on experience with the intravenous and oral use of fludarabine phosphate, the most common adverse reactions include myelosuppression (neutropenia, thrombocytopenia and anemia), fever and chills, infection, and nausea and vomiting. Other commonly reported events include malaise, fatigue, anorexia, and weakness. Serious opportunistic infections have occurred in patients with CLL treated with fludarabine phosphate. The most frequently reported adverse reactions and those reactions which are more clearly related to the drug, as reported in clinical studies conducted with intravenous and oral fludarabine phosphate, are arranged below according to body system.

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

The use of Oforta™ in combination with pentostatin is not recommended due to the risk of severe pulmonary toxicity. [See Warnings and Precautions (5.6)]

8  USE IN SPECIFIC POPULATIONS

8.1  Pregnancy

It is not known whether Oforta™ is excreted in human milk. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions including tumorigenicity in nursing infants, a decision should be made to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother.

8.4  Pediatric Use

Safety and effectiveness in pediatric patients have not been established.

8.5  Geriatric Use

Of 78 previously treated patients with B-CLL treated with Oforta™ 50% were ≥ age 65 and 3% were ≥ age 75. The response rate was generally lower among patients age 65 and older. Among previously treated patients (Study 1) age 65 and older, the overall objective response, according to standardized response criteria developed by the National Cancer Institute CLL Working Group (NCI criteria), was 41%. The safety profile among younger and older patients on study was similar. Other reported clinical experience has not identified differences in responses or safety between older and younger patients.

8.6  Patients with Renal Impairment

In patients receiving intravenous fludarabine phosphate, the total body clearance of the metabolite 2-fluoro-ara-adenine (2F-ara-A) correlated with the creatinine clearance, indicating the importance of the renal excretion pathway for the elimination of the drug. Renal clearance represented approximately 40% of the total body clearance. Patients with mild to moderate renal impairment (30 to 70 mL/min/1.73 m2) receiving 20% reduced fludarabine phosphate dose had a similar exposure compared to patients with normal renal function receiving the recommended dose (AUC; 21 nM•h/mL versus 20 nM•h/mL). Two patients with severe renal impairment (< 30 mL/min/1.73 m2) receiving 40% reduced fludarabine phosphate dose had a 40% increase in exposure compared to patients with normal renal function receiving the recommended dose. The mean total body clearance was 172 mL/min for patients with normal renal function, 124 mL/min for patients with mild to moderately impaired renal function, and 71 mL/min for the two patients with severe renal impairment.

10  OVERDOSAGE

Fludarabine phosphate (2F-ara-AMP) is a synthetic purine nucleotide antimetabolite agent. Upon administration, 2F-ara-AMP is rapidly dephosphorylated in the plasma to 2F-ara-A, which then enters into the cell. Intracellularly, 2F-ara-A is converted to the 5′-triphosphate, 2-fluoro-ara-ATP (2F-ara-ATP). 2F-ara-ATP competes with deoxyadenosine triphosphate for incorporation into DNA. Once incorporated into DNA, 2F-ara-ATP functions as a DNA chain terminator, inhibits DNA polymerase alpha, gamma, and delta, and inhibits ribonucleoside diphosphate reductase. 2F-ara-A also inhibits DNA primase and DNA ligase I. The mechanism of action of this antimetabolite is not completely characterized and may be multi-faceted.

12.2  Pharmacodynamics

Studies with the intravenous product have demonstrated that fludarabine phosphate is converted to the active metabolite, 2F-ara-A. Clinical pharmacology studies have focused on 2F-ara-A pharmacokinetics.

Following administration of the intravenous product, systemic plasma clearance of 2F-ara-A is approximately 117 mL/min to 145 mL/min. After five daily 30 minute intravenous infusions of 25 mg 2F-ara-AMP/m2 to cancer patients, trough concentrations of 2F-ara-A increased by a factor of about 2. The terminal half-life of 2F-ara-A was approximately 20 hours. Plasma protein binding of 2F-ara-A was approximately 19% to 29%. A correlation was noted between the degree of absolute granulocyte count nadir and increased area under the concentration × time curve (AUC).

2F-ara-A exhibits dose proportional increases in AUC and Cmax after single oral doses of 50 mg, 70 mg or 90 mg of 2F-ara-AMP. Cmax of 2F-ara-A occurs 1 hour to 2 hours after single or multiple oral doses and is approximately 20 % to 30 % of the maximum plasma concentrations produced at the end of a 30 minute intravenous infusion of the same dose. The absolute oral bioavailability of 2F-ara-A is 50–65% following single and repeated doses of Oforta™. Similar systemic exposure (AUC) was observed after a single 40 mg/m2 Oforta™ and a single 25 mg/m2 fludarabine phosphate intravenous dose. The terminal half-life of 2F-ara-A was similar to that following intravenous administration; approximately 20 hours. The Cmax, AUC and terminal half-life of 2F-ara-A are unaffected when administered with a high fat meal, although Tmax is slightly delayed from 1.3 hours to 2.2 hours.

Following intravenous administration, renal clearance of 2F-ara-A represents approximately 40% of the total body clearance of fludarabine phosphate, and total body clearance is inversely correlated with serum creatinine and creatinine clearance. In two patients with median creatinine clearance of 22 mL/min/1.73 m2, 2F-ara-A clearance was reduced by 56%. Dosage adjustment based on creatinine clearance is recommended as follows:

Reduce dose by 20% in patients with mild to moderate renal impairment (creatinine clearance 30 to 70 mL/min/1.73 m2). [See Warnings and Precautions (5.7)]

Reduce dose by 50% in patients with severe renal impairment (creatinine clearance < 30 mL/min/1.73 m2). [See Warnings and Precautions (5.7)]

13  NONCLINICAL TOXICOLOGY

13.1  Carcinogenesis, Mutagenesis, Impairment of Fertility

No animal carcinogenicity studies with Oforta™ have been conducted.

Oforta™ is a clastogen.

Fludarabine phosphate was clastogenic in vitro to Chinese hamster ovary cells (chromosome aberration assay) in the presence of metabolic activation and induced sister chromatid exchanges both in the presence and absence of metabolic activation. In addition, fludarabine phosphate was clastogenic in vivo (mouse micronucleus assay) but was not mutagenic to germ cells (dominant lethal test in male mice). Fludarabine phosphate was not mutagenic to bacteria (Ames test) or mammalian cells either in the presence or absence of metabolic activation.

Studies in mice, rats and dogs have demonstrated dose-related adverse effects on the male reproductive system. Observations consisted of a decrease in mean testicular weights in mice and rats with a trend toward decreased testicular weights in dogs and degeneration and necrosis of spermatogenic epithelium of the testes in mice, rats and dogs.

14  CLINICAL STUDIES

HOW SUPPLIED

Oforta™ is supplied in 10 milligram tablets that are film-coated, capsule shaped, salmon pink in color, and marked on one side with ‘LN’ in a regular hexagon. Each film-coated tablet contains 10 mg fludarabine phosphate. The tablets are supplied in blisters, each blister strip containing 5 tablets. Packages of 15 and 20 tablets are available in child-resistant containers.

NDC 0024-5820-15: 15 – 10 milligram film-coated tablets per container. Each film-coated tablet is packaged in an individual blister package; 5 tablets per blister strip; 3 blister strips packaged in a plastic bottle with a child-resistant container closure; each bottle is packaged in an individual chip-board carton.

NDC0024-5820-20: 20 – 10 milligram film-coated tablets per container. Each film-coated tablet is packaged in an individual blister package; 5 tablets per blister strip; 4 blister strips packaged in a plastic bottle with a child-resistant container closure; each bottle is packaged in an individual chip-board carton.

STORAGE

Store under normal lighting conditions at 25°C (77°F); excursions permitted to 15–30°C (59–86°F) [see USP controlled room temperature].

HANDLING AND DISPOSAL

Procedures for proper handling and disposal should be considered. Consideration should be given to handling and disposal according to guidelines issued for cytotoxic drugs. Several guidelines on this subject have been published.1–4 Caution should be exercised in the handling of Oforta™. Push tablets through foil to open. Do not remove tablets from individual blisters until immediately prior to taking or administering each scheduled dose. Do not crush tablets. Avoid exposure by direct contact of the skin or mucous membranes or by inhalation. If contact occurs, wash thoroughly with soap and water or wash the eyes immediately with gently flowing water for at least 15 minutes. Consult healthcare provider in case of a skin reaction or if the drug gets in the eyes.

17  PATIENT COUNSELING INFORMATION

17.1  Bone Marrow Suppression

Inform patients that Oforta™ decreases blood cell counts such as white blood cells, platelets, and red blood cells. Thus, it is important that periodic assessment of their blood count be performed to detect the development of neutropenia, thrombocytopenia and anemia. [See Warnings and Precautions (5.2)]

17.2  Infections

Instruct patients to notify their physician promptly if fever or other signs of infection such as chills, cough, or burning pain on urination occurs while on therapy. [See Warnings and Precautions (5.4)]

17.3  Pregnancy

Women of childbearing potential and fertile males must take contraceptive measures during and at least for 6 months after the cessation of therapy. Oforta™ may cause fetal harm when administered to a pregnant woman. [See Warnings and Precautions (5.9)]

17.4  Handling and Disposal

Instruct patients that caution should be exercised in the handling of Oforta™. Do not crush tablets. Avoid exposure by direct contact of the skin or mucous membranes or by inhalation. If contact occurs, wash thoroughly with soap and water or wash the eyes immediately with gently flowing water for at least 15 minutes. Consult healthcare provider in case of a skin reaction or if the drug gets in the eyes. Ask your healthcare provider or pharmacist for directions about how to safely dispose of Oforta™.

What Is OFORTA™?

OFORTA™ (oral fludarabine phosphate tablets) is a prescription anticancer medicine that slows or stops the growth of cancer cells in adults with chronic lymphocytic leukemia (CLL). OFORTA™ also stops or slows the growth of some healthy cells. This can cause side effects that you should know about and report to your healthcare provider.

OFORTA™ has not been studied in children.

What is the most important information I should know about OFORTA™?

On rare occasions people taking OFORTA™ can have life-threatening symptoms. If you:

• have problems seeing

• feel very sleepy, tired, or confused

• have shortness of breath or have trouble breathing

• have yellow skin or dark urine

Tell your healthcare provider right away.

What should I tell my healthcare provider before taking OFORTA™?

Before taking OFORTA™, tell your healthcare provider about all of your medical conditions, including if you:

• have kidney problems

• have bleeding problems

• are pregnant or plan to become pregnant. It is not known if OFORTA™ will harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. Women should not get pregnant during treatment with OFORTA™ because the unborn baby may be harmed. Both men and women must take contraceptive measures during and for at least six months after cessation of therapy. Call your doctor right away if you become pregnant during or in the six months after treatment with OFORTA™.

• are breast-feeding or plan to breast-feed. It is not known if OFORTA™ passes into your breast milk. You and your healthcare provider should decide if you will take OFORTA™ or breast-feed. You should not do both.

Tell your healthcare provider about all the medicines you take including prescription and non-prescription medicines, vitamins, and herbal supplements. Using OFORTA™ with certain other medicines may affect each other. Using OFORTA™ with other medicines may cause serious side effects.

Know the medicines you take. Keep a list of them with you to show your healthcare provider.

How should I take OFORTA™?

• Take OFORTA™ exactly as your healthcare provider tells you to take it.

• Your healthcare provider will tell you how much and when to take OFORTA™.

• OFORTA™ can be taken with or without food.

• Push tablets through foil to open. Do not remove tablets from individual blisters until immediately prior to taking or administering each scheduled dose.

• OFORTA™ tablets have to be swallowed whole with water; they should never be chewed, crushed, or broken. If you cannot swallow OFORTA™ whole, ask your healthcare provider if you can take another form of fludarabine.

• If you miss a dose call your healthcare provider.

• If you take too much call your healthcare provider.

What should I avoid while taking OFORTA™?

• Do not allow other people or pets to touch or take OFORTA™.

• Avoid letting the tablets (whole or broken) touch your skin

• Do not chew tablets or hold them in your mouth. Swallow tablets right away.

• Do not breathe in any powder or residue from a broken tablet.

• If you touch a broken tablet, wash the area thoroughly with soap and water.

• If any OFORTA™ gets in your eyes, wash your eyes right away with water for at least 15 minutes, and call your healthcare provider right away.

• Call your healthcare provider right away in case of a skin reaction.

What are the possible side effects of OFORTA™?

See “What is the most important information I should know about OFORTA™?”

OFORTA™ may cause serious side effects, including:

Low blood cell counts.

OFORTA™ lessens the number of blood cells that fight infection, help your blood to clot, and carry oxygen throughout your body. This can result in

• Infection

• Bleeding

• Tiredness.

Avoid activities that can raise your chances of these conditions. Your healthcare provider will check your blood counts so that you will know when you are most at risk for infection, bleeding, and tiredness.

Call your healthcare provider right away if you have a temperature of 100.5°F or above or do not feel well. Do not take a fever medicine until you check with your healthcare provider.

OFORTA™ may cause other side effects, including:

• nausea and vomiting

• loss of appetite

• skin rash

• swelling in your legs

• diarrhea

• redness and irritation inside your mouth (stomatitis)

• abdominal and muscle pain.

Tell your healthcare provider if you have any side effect that bothers you or that does not go away. These are not all the possible side effects of OFORTA™. For more information, ask your healthcare provider or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

How should I store and throw away OFORTA™?

• Store OFORTA™ at 59–86°F (15–30°C).

• Keep under normal light in a child-resistant container.

• Safely throw away medicine that is out of date or no longer needed.

• Do not put OFORTA™ in your regular household trash.

• Ask your healthcare provider or pharmacist for directions about how to safely throw away and handle OFORTA™.

Keep OFORTA™ and all medicines out of the reach of children.

General information about OFORTA™

Medicines are sometimes prescribed for conditions that are not mentioned in patient information. Do not use OFORTA™ for a condition for which it was not prescribed. Do not give OFORTA™ to other people, even if they have the same symptoms you have. It may harm them.

This patient information leaflet summarizes the most important information about OFORTA™. For more information about OFORTA™, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about OFORTA™ that is written for health professionals. For more information call 1-800-633-1610.