Targeted Drug Therapy for Bile Duct Cancer

As researchers learn more about the changes in cells that cause cancer, they've developed drugs to target some of these changes. These targeted drugs work differently from standard chemotherapy (chemo) drugs. They sometimes work when standard chemo drugs don’t, and they often have different side effects.

FGFR2 inhibitors

FGFRs (fibroblast growth factor receptors) are proteins on cells that help them grow and divide normally. A small number of people with bile duct cancer within the liver have changes in the genes that make FGFRs, which result in abnormal FGFR proteins that cause cells to grow out of control and turn into cancer.

Pemigatinib (Pemazyre) and futibatinib (Lytgobi) are FGFR2 inhibitors. They block the abnormal FGFR2 protein in bile duct cancer cells and keep them from growing and spreading to other places.

These drugs can be used to treat some advanced bile duct cancers that cannot be removed by surgery or have spread to distant areas after at least one previous chemotherapy treatment. For these drugs to work, your cancer must have an abnormal FGFR2 gene, so your cancer will be tested before starting any of these drugs.

These medicines are taken by mouth as tablets, typically once a day. 

Possible side effects of FGFR2 inhibitors

The most common side effects of FGFR2 inhibitors include kidney problems, hair loss, diarrhea, constipation, nail problems, fatigue, taste changes, nausea, vomiting, dry mouth or mouth sores, loss of appetite, dry skin, dry eye or other eye problems, hand-foot syndrome, abdominal (belly) pain, and changes in blood mineral levels.

IDH1 inhibitor

In some people with bile duct cancer, the cancer cells have a change (mutation) in the IDH1 gene, which normally helps cells make the IDH1 protein. Mutations in this gene can lead to an abnormal IDH1 protein, which can stop cells from maturing the way they normally would.

Ivosidenib (Tibsovo) is an IDH1 inhibitor. It blocks the abnormal IDH1 protein, which seems to help the cancer cells mature into more normal cells. This drug can be used in people with advanced, previously treated bile duct cancer, if the cancer cells are found to have an IDH1 mutation. Your doctor can test your cancer cells to see if they have an IDH1 mutation.

This drug is taken by mouth, once a day.

Possible side effects of ivosidenib

Common side effects can include fatigue, nausea, vomiting, abdominal (belly) pain or swelling, diarrhea, loss of appetite, cough, low red blood cell counts (anemia), rash, and changes in lab tests showing the drug is affecting the liver.

Less common but more serious side effects can include changes in heart rhythm, pneumonia, and jaundice (yellowing of the eyes and skin).