panitumumab


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panitumumab

(pan-i-tu-mu-mab) ,

Vectibix

(trade name)

Classification

Therapeutic: antineoplastics
Pharmacologic: monoclonal antibodies
Pregnancy Category: C

Indications

Treatment of metastatic colorectal cancer that expresses EGFR (epidermal growth factor receptor) and has failed conventional treatments (to be used as monotherapy).

Action

genetic implication Binds to EGFR resulting in inactivation of kinases that regulate proliferation and transformation.

Therapeutic effects

Decreased progression of colorectal cancer.

Pharmacokinetics

Absorption: IV administration results in complete bioavailability.
Distribution: Monoclonal antibodies cross the placenta and enter breast milk.
Metabolism and Excretion: Unknown.
Half-life: 7.5 days.

Time/action profile

ROUTEONSETPEAKDURATION
IVunknownend of infusionunknown

Contraindications/Precautions

Contraindicated in: Concurrent leucovorin;genetic implication Patients whose tumors have KRAS mutations in codon 12 or 13 (not effective); Obstetric / Lactation: Pregnancy or lactation.
Use Cautiously in: Pediatric: Safety not established.

Adverse Reactions/Side Effects

Central nervous system

  • fatigue (most frequent)

Ear, Eye, Nose, Throat

  • ocular toxicity (life-threatening)
  • eyelash growth

Respiratory

  • pulmonary fibrosis (life-threatening)
  • cough (most frequent)

Gastrointestinal

  • abdominal pain (most frequent)
  • constipation (most frequent)
  • diarrhea (most frequent)
  • nausea (most frequent)
  • vomiting (most frequent)
  • stomatitis

Dermatologic

  • necrotizing fasciitis (life-threatening)
  • paromychia (most frequent)
  • abscesses
  • dry skin
  • erythema
  • photosensitivity
  • pruritis
  • rash
  • skin fissures

Fluid and Electrolyte

  • edema (most frequent)
  • hypocalcemia
  • hypomagnesemia (most frequent)

Miscellaneous

  • infusion reactions (life-threatening)
  • sepsis (life-threatening)

Interactions

Drug-Drug interaction

None noted.

Route/Dosage

Intravenous (Adults) 6 mg/kg as a 60-min infusion every 14 days; ↓ infusion rates and dose modifications are recommended for infusion reactions and other serious toxicities.

Availability

Solution for IV administration (requires dilution): 20 mg/mL

Nursing implications

Nursing assessment

  • Assess for dermatologic toxicity (dermatitis acneiform, pruritus, erythema, rash, skin exfoliation, paronychia, dry skin, skin fissures). If severe, may lead to infection (sepsis, septic death, abscesses requiring incision and drainage). With severe reactions, withhold panitumumab and monitor for inflammatory or infectious sequelae.
  • Monitor for severe infusion reactions (anaphylactic reaction, bronchospasm, fever, chills, hypotension). If severe reaction occurs, stop panitumumab; may require permanent discontinuation.
  • Assess for pulmonary fibrosis (cough, wheezing, exertional dyspnea, interstitial lung disease, pneumonitis, lung infiltrates). Permanently discontinue panitumumab if these signs occur.
  • Monitor for diarrhea during therapy.
  • Lab Test Considerations: Monitor electrolyte levels periodically during and for 8 wk after completion of therapy. May cause hypomagnesemia and hypocalcemia.

Potential Nursing Diagnoses

Risk for impaired skin integrity (Adverse Reactions)
Impaired gas exchange (Adverse Reactions)

Implementation

  • Intermittent Infusion: Diluent: Withdraw necessary amount of panitumumab. Dilute to a volume of 100 mL with 0.9% NaCl; dilute doses >1000 mg with 150 mL.Concentration: 10 mg/mL. Mix by inverting gently; do not shake. Administer via infusion pump using a low-protein binding 0.2 mcg or 0.22 mcg in-line filter. Solution is colorless and may contain a small amount of visible translucent to white, amorphous, proteinaceous particles. Do not administer solutions that are discolored or contain particulate matter. Store in refrigerator; do not freeze. Use diluted solution within 6 hr of preparation if stored at room temperature or within 24 hr if refrigerated.
  • Rate: Administer over 60 min every 14 days. Administer doses >1000 mg over 90 min.
    • If mild to moderate infusion reaction (Grade 1 or 2) occurs decrease infusion rate by 50%. If severe reaction (Grade 3 or 4) occurs, immediately and permanently discontinue panitumumab.
    • If severe dermatologic toxicities (Grade 3 or higher) or those considered intolerable occur, withhold panitumumab. If toxicity does not improve to ≤ grade 2 within 1 mo, discontinue permanently. If toxicity improves to ≤ grade 2 and patient improves symptomatically after withholding no more than 2 doses, resume therapy at 50% dose. If toxicities recur, permanently discontinue panitumumab. If toxicities do not recur, increase subsequent doses in 25% increments of the original dose until recommended dose of 6 mg/kg is reached.
  • Y-Site Incompatibility: Flush line before and after administration with 0.9% NaCl. Do not mix with other medications or solutions.

Patient/Family Teaching

  • Explain purpose of panitumumab to patient.
  • May cause photosensitivity. Caution patient to wear sunscreen and hats and to limit sun exposure.
  • Advise patient to notify health care professional if signs and symptoms of dermatologic toxicity, infusion reactions, pulmonary fibrosis, or ocular changes occur.
  • Advise patient that panitumumab may cause fertility impairment and may have teratogenic effects. Caution women of childbearing yr to use contraception during and for at least 6 mo after the last dose and not to breast feed during and for at least 2 mo after the last dose of panitumumab. Encourage women who become pregnant to enroll in Amgen’s Pregnancy Surveillance Program by calling 1-800-772-6436.
  • Emphasize the need for periodic blood tests to monitor electrolyte levels.

Evaluation/Desired Outcomes

  • Decreased progression of colorectal cancer.

panitumumab

a miscellaneous antineoplastic.
indications This drug is used to treat metastatic colon cancer expressing epidermal growth factor receptor.
contraindication Known hypersensitivity to this drug prohibits its use.
adverse effects Adverse effects of this drug include fatigue, ocular toxicity, peripheral edema, anorexia, mouth ulceration, abdominal pain, constipation, thrombophlebitis, pruritus, skin fissure, hypocalcemia, hypomagnesemia, antibody formation, dyspnea, pneumonitis, and wheezing. Life-threatening side effects include exfoliative dermatitis, bronchospasm, cough, hypoxia, and pulmonary fibrosis. Common side effects include nausea, diarrhea, vomiting, and rash.
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References in periodicals archive ?
In his study of the effect of prophylaxis, 95 patients initiating the EGFR inhibitor panitumumab were randomized to a prophylactic regimen that included skin moisturizers, sunscreen, a topical steroid, and doxycycline, or to treatment adjusted for symptoms once they developed (J Clin Oncol.
Two available anti epidermal growth factor receptor monoclonal antibodies are cetuximab and panitumumab which have been approved for metastatic colorectal cancer treatment.
Cetuximab and Panitumumab are both monoclonal antibodies that are used in the treatment of colorectal cancer and competitively inhibit epidermal growth factor receptor (EGFR).
Another example is the compound panitumumab (Vectibix), which was initially approved by the U.
The moderate uptake of other late-stage pipeline products, panitumumab and Xilonix, following their expected approval, is expected to drive additional growth within this market.
At ASCO, Amgen also presented results from Phase II tests that reinforced the improved overall survival benefit of panitumumab (Vectibix) when used in combination with FOLFOX, an oxaliplatin-based chemotherapy regimen, compared to bevacizumab (Avastin) plus FOLFOX as first-line treatment in patients with wild-type RAS metastatic colorectal cancer (mCRC).
Another drug used to treat bowel cancer that has spread to other parts of the body, panitumumab, also showed a large increase in prescriptions after the CDF was introduced in England.
Panitumumab is a fully humanized mab which binds with greater affinity (compared to cetuximab) to ErbB1, causing no immunogenicity.
The American Cancer Society (ACS), as is its habit, paints an optimistic picture: "Several targeted therapies are approved by the FDA to treat metastatic colorectal cancer: bevacizumab (Avastin) and ziv-aflibercept (Zaltrap) block the growth of blood vessels to the tumor, and cetuximab (Erbitux) and panitumumab (Vectibix) block the effects of hormone-like factors that promote cancer growth.
These drugs are Degarelix, Abiraterone acetate, Plerixafor, Eribulin mesylate, Mucotrol, Crizotinib, Etravirine, Nelarabine, Fingolimod, Tolvaptan, Rilpivirine, Vemurafenib, Lipiodol UF, Cabazitaxel and Panitumumab.
El concentrado panitumumab, miembro de una nueva clase de farmacos, inhibe el crecimiento de las celulas malignas y provoca su suicidio, mejorando la sobrevida y dejando a los pacientes libres de la progresion del mal.
This result quickly led to the use of panitumumab and cetuximab without testing for EGFR protein expression.