WARNINGS
Included as part of the "PRECAUTIONS" Section
PRECAUTIONS
Secondary Malignancy Or Leukemia
The risk of developing secondary malignancies, including leukemia, is increased following
treatment with COSMEGEN.
Veno-Occlusive Disease
Severe and fatal hepatic veno-occlusive disease (VOD) can occur with COSMEGEN. Risk
factors for the development of VOD include age younger than 4 years or concomitant
radiotherapy. After treatment with COSMEGEN, monitor frequently for signs and symptoms of
VOD; these include elevations in AST, ALT, total bilirubin, hepatomegaly, weight gain, or
ascites. If patients develop VOD, considering delaying next dose of COSMEGEN. Resume,
reduce dose or permanently discontinue based on severity of reaction and disease being treated.
Extravasation
Extravasation of COSMEGEN can result in severe local tissue injury manifesting as blistering,
ulcerations and persistent pain requiring wide excision surgery followed by split-thickness skin
grafting. If any signs or symptoms of extravasation occur, immediately interrupt the injection or
infusion. Apply ice to the site intermittently for 15 minutes, 4 times a day for 3 days [see DOSAGE AND ADMINISTRATION]. Observe closely and consult plastic surgery if necessary based on
severity of reaction.
Myelosuppression
Severe and fatal myelosuppression, which may include neutropenia, thrombocytopenia and
anemia, can occur with COSMEGEN. The nadir in neutrophil counts generally occurs 14 to
21 days after administration. Obtain complete blood counts prior to each treatment cycle. Delay
next dose of COSMEGEN if severe myelosuppression has not improved. Consider dose
reduction for patients with prolonged myelosuppression based on severity of reaction and disease
being treated.
Immunizations
The safety with live viral vaccines following COSMEGEN has not been studied and vaccination
with live virus vaccines is not recommended before or during treatment.
Severe Mucocutaneous Reactions
Severe mucocutaneous reactions, such as Steven-Johnson syndrome and Toxic Epidermal
Necrolysis (TEN), can occur with COSMEGEN. Permanently discontinue COSMEGEN in
patients who experience a severe mucocutaneous reaction.
Renal Toxicity
Abnormalities of renal function can occur with COSMEGEN. Monitor creatinine and
electrolytes frequently during COSMEGEN therapy.
Hepatotoxicity
Hepatotoxicity can occur with COSMEGEN. Monitor AST, ALT, alkaline phosphatase, and
bilirubin prior to and during COSMEGEN therapy.
Potentiation Of Radiation Toxicity And Radiation Recall
COSMEGEN can increase radiation-induced gastrointestinal toxicity, myelosuppression, or
erythema and vesiculation of the skin or buccal and pharyngeal mucosa. Reduce the dose of
COSMEGEN by 50% during concomitant radiation.
Radiation recall, affecting previously treated radiation fields, can occur in patients who receive
COSMEGEN after prior radiation therapy. Although the risk can occur with distant radiation
exposure, the risk appears highest when COSMEGEN is administered within two months of
prior radiation.
Embryo-Fetal Toxicity
Based on findings from animal studies and its mechanism of action, COSMEGEN can cause
fetal harm when administered to a pregnant woman. In animal reproduction studies,
administration of dactinomycin to pregnant animals during the period of organogenesis was
teratogenic, resulting in malformations at doses lower than the recommended human dose.
Advise pregnant women of the potential risk to the fetus. Advise females of reproductive
potential to use effective contraception during treatment with COSMEGEN and for at least
6 months after the final dose. Advise males with female partners of reproductive potential to use
effective contraception during treatment with COSMEGEN and for 3 months after the final dose
[see Use In Specific Populations].
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment Of Fertility
Dactinomycin is a carcinogen in animals. Local sarcomas were produced in mice and rats after
repeated subcutaneous or intraperitoneal injections. Mesenchymal tumors occurred in male rats
given intraperitoneal injections of 50 mcg/kg, 2 to 5 times per week, for 18 weeks, at doses
(based on body surface area) 0.5 times the clinical dose of 1250 mcg/m2.
Dactinomycin was mutagenic in several in vitro and in vivo test systems including human
fibroblasts and leukocytes, and HeLa cells. DNA damage and cytogenetic effects have been
demonstrated in the mouse and the rat.
Use In Specific Populations
Pregnancy
Risk Summary
Based on findings from animal studies and its mechanism of action, COSMEGEN can cause
fetal harm when administered to a pregnant woman [see CLINICAL PHARMACOLOGY]. In
animal reproduction studies, administration of dactinomycin to pregnant animals during the
period of organogenesis was teratogenic, resulting in malformations at doses lower than the
recommended human dose (see Data). Advise pregnant women of the potential risk to a fetus
[see Females And Males Of Reproductive Potential].
In the U.S. general population, the estimated background risk of major birth defects and
miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.
Data
Animal Data
Dactinomycin was teratogenic in animals. Administration of dactinomycin to pregnant rats,
rabbits, and hamsters during the period of organogenesis, increased the incidence of fetal
malformations and caused embryotoxicity at doses (based on body surface area) as low as
0.2 times the clinical dose of 1250 mcg/m2.
Lactation
Risk Summary
There are no data on the presence of dactinomycin or its metabolites in human milk or their
effects on the breastfed infant or on milk production. Because of the potential for serious adverse
reactions in breastfed infants from COSMEGEN, advise women not to breastfeed during
treatment with COSMEGEN and, based on limited published data regarding the dactinomycin
half-life, for 14 days after the final dose.
Females And Males Of Reproductive Potential
Pregnancy Testing
Verify the pregnancy status of females of reproductive potential prior to initiating COSMEGEN
[see Pregnancy].
Contraception
COSMEGEN can cause fetal harm when administered to a pregnant woman [see Pregnancy].
Females
Advise females of reproductive potential to use effective contraception during treatment with
COSMEGEN and for at least 6 months after the final dose.
Males
Because of the potential for genotoxicity, advise males with female partners of reproductive
potential to use effective contraception during treatment with COSMEGEN and for 3 months
after the final dose [see Nonclinical Toxicology].
Pediatric Use
The safety and effectiveness of dactinomycin have been established in pediatric patients with
Wilms tumor, rhabdomyosarcoma, Ewing sarcoma, and metastatic nonseminomatous testicular
cancer.
The safety and effectiveness of dactinomycin have been established in post-menarchal pediatric
patients with gestational trophoblastic neoplasia.
The safety and effectiveness of COSMEGEN have not been established in pediatric patients
undergoing regional perfusion for locally recurrent or locoregional solid malignancies.
Geriatric Use
Clinical studies of COSMEGEN did not include sufficient numbers of subjects aged 65 and over
to determine whether they respond differently from younger subjects.