Avastin

Approved Uses

Avastin is used to treat various types of advanced or metastatic cancers. It is often prescribed in combination with other chemotherapy medications. The specific conditions it is used for include:

• Colorectal Cancer: Used for cancer of the colon or rectum that has spread to other parts of the body.
• Lung Cancer: Used for certain types of non-small cell lung cancer.
• Glioblastoma: Used to treat a specific type of brain tumor that has returned after previous treatment.
• Kidney Cancer: Used for metastatic renal cell carcinoma.
• Cervical Cancer: Used for cancer of the cervix that is persistent, recurrent, or has spread.
• Ovarian, Fallopian Tube, or Peritoneal Cancer: Used for these types of cancers, often when they have returned or are in an advanced stage.

In many cases, Avastin is used when the cancer has spread to other parts of the body or has not responded to other treatments.

Angiogenesis Inhibition

Avastin is a monoclonal antibody that acts as an angiogenesis inhibitor. This means it is designed to interfere with the growth of new blood vessels that tumors need to survive and expand.

Blocking VEGF

Cancerous tumors release a protein called vascular endothelial growth factor (VEGF). This protein acts as a signal that encourages the body to grow new blood vessels toward the tumor, providing it with oxygen and nutrients. Avastin works by specifically targeting and binding to these VEGF proteins.

By attaching to VEGF, Avastin prevents the protein from interacting with its receptors on the surface of blood vessel cells. This action blocks the signal for new blood vessel growth, effectively starving the tumor of its blood supply.

Effects on Cancer Growth

When the tumor's blood supply is restricted, several things may happen:

• Tumor shrinkage: The tumor may stop growing or begin to shrink because it lacks the necessary nutrients.
• Reduced metastasis: The tumor's ability to spread to other parts of the body may be reduced when its blood vessel network is limited.
• Improved treatment delivery: The medication may decrease the pressure inside a tumor, which can sometimes help other cancer treatments, such as chemotherapy, reach the cancer cells more effectively.

Common Side Effects

Many people using Avastin experience mild to moderate side effects. These may include:

• Nosebleeds
• Headache
• High blood pressure
• Back pain
• Dry or flaky skin
• Watery eyes
• Changes in the sense of taste
• Stuffy or runny nose
• Diarrhea or loss of appetite
• Feeling tired or weak

Serious Side Effects

Some side effects can be severe and require immediate medical attention. Contact a healthcare provider right away if you experience:

• Gastrointestinal complications: Development of a hole in the stomach or intestines (perforation).
• Wound healing issues: Incisions that do not heal properly or open up after surgery.
• Severe bleeding: Coughing up blood, heavy vaginal bleeding, or any bleeding that will not stop.
• Blood clots: Symptoms such as chest pain, sudden shortness of breath, or sudden numbness or weakness on one side of the body.
• Kidney damage: Signs include foamy urine or swelling in the hands, legs, or feet.
• Neurological problems: Confusion, vision changes, or seizures, which may be signs of a rare brain condition.
• Infusion reactions: Dizziness, wheezing, or shivering during or shortly after the injection.

Serious Risks and Boxed Warnings

Avastin is associated with several severe complications that require careful monitoring. These include:

• Gastrointestinal Perforation: The formation of holes in the stomach or intestines, which can be fatal.
• Wound Healing: This medication can prevent wounds from healing properly. It is generally avoided for several weeks before and after major surgical procedures.
• Severe Bleeding: There is a risk of serious internal bleeding, including coughing up blood or bleeding in the digestive tract.

Cardiovascular and Neurological Effects

• High Blood Pressure: New or worsening hypertension is a common side effect that may require treatment.
• Blood Clots: There is an increased risk of blood clots in the arteries, which can lead to a stroke or heart attack.
• Neurological Issues: A rare condition called posterior reversible encephalopathy syndrome (PRES) may occur, causing seizures, confusion, or vision loss.

Additional Precautions

• Kidney Function: The drug can cause protein to appear in the urine, indicating potential kidney damage.
• Infusion Reactions: Some individuals may experience reactions during the administration of the drug, such as dizziness or breathing difficulties.
• Pregnancy and Fertility: This medication can cause birth defects or pregnancy loss. It may also lead to ovarian failure in women of childbearing age.

Pregnancy

Avastin can cause serious harm to an unborn baby, including birth defects or pregnancy loss. Because of these risks, healthcare providers recommend that people who can become pregnant use effective birth control while receiving this medication and for at least 6 months after the final dose. If you become pregnant or think you might be pregnant during treatment, you should contact your healthcare provider immediately.

Fertility

This medication may affect a woman's ability to have children. It can cause the ovaries to stop working, which may lead to irregular periods or the complete stopping of menstrual cycles. It is not certain if these effects on fertility are permanent.

Breastfeeding

It is not known whether Avastin passes into human breast milk. Due to the risk of serious side effects in a nursing infant, breastfeeding is not recommended during treatment and for at least 6 months after the last dose. It is important to discuss feeding options with a healthcare provider to ensure the safety of the infant.

Available Forms

Avastin is supplied as a preservative-free, sterile liquid solution. It is intended for intravenous use after being diluted by a medical professional.

Administration

This medication is administered as an infusion into a vein. It is typically given in a hospital or clinical setting by a doctor or nurse and is not available for self-administration.

FDA Approval Status

Avastin is approved by the U.S. Food and Drug Administration (FDA) for the treatment of several specific types of advanced or metastatic cancers. It is a monoclonal antibody that is typically administered in combination with chemotherapy or other targeted treatments.

Approved Indications

The FDA has approved Avastin for the treatment of the following conditions:

• Metastatic colorectal cancer
• Non-squamous non-small cell lung cancer
• Glioblastoma (specifically for patients with progressive disease following prior therapy)
• Metastatic renal cell carcinoma (kidney cancer)
• Persistent, recurrent, or metastatic cervical cancer
• Epithelial ovarian, fallopian tube, or primary peritoneal cancer

Boxed Warning

The FDA requires a boxed warning for Avastin due to the risk of serious and potentially fatal complications. These include:

• Gastrointestinal Perforation: The development of holes in the stomach or intestines.
• Surgery and Wound Healing Complications: Avastin can interfere with the body's ability to heal wounds. It should be stopped at least 28 days before elective surgery and should not be started or restarted until surgical wounds are fully healed.
• Hemorrhage: Severe or fatal bleeding, including coughing up blood, has occurred in patients receiving this medication.

Regulatory History

Avastin was the first angiogenesis inhibitor approved by the FDA. While it was previously granted accelerated approval for the treatment of breast cancer, that specific indication was later revoked by the FDA because subsequent studies did not show the drug was safe and effective for that use.

Factors Influencing Cost

The total price of Avastin treatment can vary significantly based on several factors:

• Dosage and Frequency: The amount of medication needed and how often it is administered depend on the patient's weight and the specific type of cancer being treated.
• Administration Fees: Because Avastin is an intravenous infusion, costs include not only the drug but also the fees for the healthcare facility and the medical staff performing the procedure.
• Insurance Coverage: Most private insurance plans and Medicare cover Avastin for approved uses, though patients may still be responsible for deductibles, copayments, or coinsurance.

Biosimilar Options

Avastin is a biologic medication. There are several FDA-approved biosimilars available, such as Mvasi and Zirabev. Biosimilars are highly similar to the original biologic and are typically available at a lower cost than the brand-name drug.

Financial Assistance

The manufacturer of Avastin offers programs to help patients manage the cost of the medication. These may include copay cards for those with commercial insurance or patient assistance programs for individuals who are uninsured or underinsured. Patients should consult with their healthcare provider or the manufacturer's access services to explore these options.