Zelboraf Side Effects: Diarrhea & Other Bad Side Effects

Zelboraf Side Effects: Diarrhea & Other Bad Side Effects. Europe’s drug regulator has approved the targeted melanoma drug Zelboraf (vemurafenib), expanding the treatment options available to nearly 160,000 people who are afflicted every year by the deadliest form of skin cancer.

The European Medicines Agency’s approval of Zelboraf follows that of the United States Food and Drug Administration given in August, and Roche Holding AG, the drug’s Swiss maker, said it expects the European Commission to endorse the approval formally in February 2012.

The new medication is targeted for patients with tumors that have a mutation in a gene known as BRAF that allows melanoma cells to grow. About half of all melanomas have the genetic aberration the drug targets.

zelboraf side effects

Zelboraf is given as a twice-daily pill and is designed to be used alongside a companion diagnostic test, also from Roche, that identifies which patients have the BRAF genetic mutation.

The European drugs watchdog said it backed Zelboraf for treating patients with the BRAF mutation who suffered from metastatic or unresectable melanoma—or melanoma that cannot be removed by surgery.

Melanoma has a 90 percent survival rate when treated early, and because of its location on the skin’s surface, it is relatively easy to treat.

But melanoma’s invasive nature means that if left too long, it becomes highly aggressive: it can spread quickly to internal organs and the average survival rate is six to nine months.

Only one-fourth of all people with metastatic or unresectable melanoma survive more than a year and less than 15 percent remain alive after five years. In contrast, 90 percent of all people with localized melanoma survive.

Thus, there is an urgent need for medicines to treat metastatic melanoma, which is also the sixth most common malignancy in men and seventh most common cancer in women. Every year, around 60,000 people are affected by this cancer, and 15,000 people die from it.

“There is a high unmet medical need for alternative treatments for metastatic melanoma that improves survival of patients,” Europe’s drug regulator told Bloomberg.

The agency said the benefits of the new drug—lengthened period of time before melanoma progressed and increased the overall survival rate—outweighed outweigh its potential risks.

Zelboraf side effects include: back pain, constipation, cough, diarrhea, dizziness, dry skin, extreme photosensitivity, hair loss, headache, joint or muscle pain, loss of appetite, nausea, rash, secondary growths, taste changes, thickening of the skin, tiredness, vomiting and weakness.

Severe Zelboraf Side Effects. Patients are advised to see the doctor immediately if they experience any of these side effects—which are severe:

  • Severe allergic reactions—rash, hives, itching, difficulty breathing or swallowing, tightness in the chest or throat, swelling of the mouth, face, lips, or tongue, unusual hoarseness
  • Burning, numbness, or tingling
  • Eye pain, swelling, or redness
  • Fainting
  • Fast or irregular heartbeat
  • Fever
  • Light-headedness
  • Mouth sores or blisters
  • Red, swollen, blistered, or peeling skin
  • Severe or persistent dizziness
  • Swelling of the hands, feet, or ankles
  • Symptoms of liver problems—dark urine, pale stools, yellowing of the eyes or skin, unusual tiredness, nausea, or vomiting, persistent loss of appetite, severe stomach pain
  • Tingling, pain, redness, or swelling of the palms of the hands and soles of the feet
  • Vision changes –blurred vision, sensitivity to light

The U.S. FDA said this is not a complete list of all side effects that may occur when taking Zelboraf, and patients are encouraged to contact their health care providers if they have questions about side effects.

Zelboraf was developed in partnership with Daiichi Sankyo and became the second drug to be approved for melanoma in the U.S. this year, after Yervoy from Bristol-Myers Squibb.

zelboraf side effects - constipation

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In August, Roche said that Zelboraf would cost just over $56,000 for a six-month course of treatment in the U.S. It has yet to announce a price in Europe.

More effective than chemotherapy
In June (2011), Reuters reported that advanced melanoma patients treated with Zelboraf in a clinical trial were 63 percent less likely to die than patients given chemotherapy.

The trial results were “better than we expected,” Dr. Paul Chapman of Memorial Sloan-Kettering Cancer Center in New York and the study’s lead investigator told Reuters.

Dr. Chapman noted that the testing plan was changed after it became clear that patients were faring better on the targeted drug.

The study, which was presented during the meeting of the American Society of Clinical Oncology, was done on 675 patients with previously untreated, inoperable late-stage metastatic melanoma with the BRAF mutation.

After an average of three months of treatment, patients receiving Zelboraf had a 63 percent reduced risk of death compared to patients given the chemotherapy drug dacarbazine.

Zelboraf Side Effects: Diarrhea & Other Bad Side Effects posted 9 January 2012. Latest update on 3 October 2016.