Liver enzyme rises and nerve changes on T-DM1

T-DM1, whose full name is trastuzumab emtansine and brand name Kadcyla, carries a chemotherapy medicine called DM1 into HER2-positive cancer cells. Most of the chemotherapy stays attached until it reaches its target, but some reaches healthy tissues, and two of the places that notice it are the liver and the nerves. Rises in liver enzymes on blood tests are one of the most common findings on T-DM1. They are usually mild, cause no symptoms, and often peak about a week after a dose before settling by the next cycle. That is why liver tests are checked before every dose. If the rise is larger, your team may delay a dose until the numbers improve, lower the dose, or in rare cases stop T-DM1 altogether. Serious liver damage is uncommon but has been reported, so symptoms such as yellow skin or eyes, dark urine or pain under the right ribs need urgent attention. Nerve changes, known as peripheral nerve damage, are also fairly common. They usually show up as tingling, numbness or a pins-and-needles feeling in the fingers or toes. Many people starting T-DM1 already have some nerve damage from earlier chemotherapy such as paclitaxel or docetaxel, and T-DM1 can make it worse. Most nerve symptoms are mild. If they become troublesome, a pause or lower dose often helps, and they tend to improve slowly after treatment ends.

Liver rises are usually mild

Most people have small, temporary changes that settle between doses without any treatment.

Tests before every dose

Routine blood tests catch changes early, long before most people would feel anything.

Report nerve symptoms early

Tingling or numbness that worsens is easier to manage when your team hears about it soon.

Liver and nerve effects are well described, but no one can say in advance exactly who will develop them or how much.

Nerve damage may not fully recover

For most people it improves over months after treatment, but some are left with lasting numbness, especially if earlier chemotherapy had already caused damage.

No proven prevention

No medicine or supplement has been clearly shown to prevent nerve damage from T-DM1. Early reporting and dose adjustment remain the main tools.

Other causes are possible

Liver test changes can come from other medicines, alcohol, infections or cancer in the liver, so your team may look for other causes.

What this page cannot tell you

It cannot interpret your own results. A number that looks high may be acceptable in context, and your team is best placed to judge.

Numb fingers and feet can make everyday tasks harder and raise the chance of injury. Small changes at home help a great deal.

Protect your feet

Wear comfortable, well-fitting footwear indoors and out, check your feet daily for cuts, and keep floors clear to reduce the risk of falls.

Watch the temperature

Test bath water with your elbow or a thermometer, and use gloves when handling hot pans or very cold items, since reduced feeling can hide burns.

Keep moving

Gentle walking, balance exercises and hand exercises can help you stay steady. A physiotherapist can suggest a routine that suits you.

Ask about pain relief

If nerve symptoms become painful, some medicines used for nerve pain may help. Your doctor can advise whether one is suitable.