Tag Archive for: TP53 mutation

How Does Biomarker Testing Impact Non-Small Cell Lung Cancer Care?

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How Does Biomarker Testing Impact Non-Small Cell Lung Cancer Care? from Patient Empowerment Network on Vimeo.

Biomarker testing identifies certain genes, proteins, or other molecules present in a biologic sample. Dr. Tejas Patil, of University of Colorado Cancer Center, discusses how results from these tests can be used to determine a treatment approach for non-small cell lung cancer (NSCLC).

Dr. Tejas Patil is an academic thoracic oncologist at the University of Colorado Cancer Center focused on targeted therapies and novel biomarkers in lung cancer. Learn more about Dr. Patil, here.

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Transcript:

Katherine:

Biomarker testing is important prior to choosing therapy for non-small cell lung cancer. What is this test and how long does it take to get results? 

Dr. Patil:

That is a great question. So, a biomarker is a biological molecule found in blood or other body fluids or tissues that is a sign of a normal or an abnormal process.  

Or let me reframe that as it represents having some kind of medical condition or disease. Now, it’s a very broad definition. Basically, a biomarker can be used to see how well the body responds to a treatment for a disease or a condition. And when we look at it from a genetic perspective, sometimes the term that you’ll see is a molecular marker or a signature molecule.  

So, these are terms that are sort of interchangeable with biomarkers. But the role of a biomarker is to help ascertain how well the body responds to a certain medical intervention, broadly speaking. 

Katherine:

Okay. What question should a patient ask their doctor about test results? 

Dr. Patil:

So that’s a very complicated question, and I will do my best to answer it succinctly. So, my personal view is that for any test to be meaningful, it should impact medical decision-making in some very concrete way.  

Specifically, with biomarkers, the result should either be prognostic or predictive and I’ll define what those terms are. So, a predictive biomarker is one that helps determine if a certain therapy will be effective. So, I’m going to use lung cancer as an example. In EGFR mutation in non-small cell lung cancer allows a doctor to prescribe an EGFR targeted therapy called osimertinib (Tagrisso). Therefore, in this example, the EGFR mutation is predictive.  

It opens the door for this targeted option that would otherwise not have been available if the patient did not have this EGFR mutation. A prognostic marker is a little different. This is the type of marker that helps categorize risk. So, in the same example I used earlier, that patient may have an EGFR mutation.  

They can also have a different mutation called TP53. Now this TP53 mutation doesn’t influence therapy. It’s not targetable, but it does influence risk.  

And so, there’s been a lot of emerging data to show that patients with TP53 mutations have worse outcomes on targeted therapies than patients without TP53. And in that case, that mutation is what we call a prognostic biomarker. 

What is High-Risk CLL and How Is It Treated?

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What is High-Risk CLL and How Is It Treated? from Patient Empowerment Network on Vimeo. 

What exactly is high-risk chronic lymphocytic leukemia (CLL), and how is it treated? Dr. Lyndsey Roeker discusses biomarkers that indicate high-risk CLL as well as treatment approaches that may be used for targeting specific subtypes of CLL.

Dr. Lyndsey Roeker is a hematologic oncologist at Memorial Sloan Kettering Cancer Center. Learn more about Dr. Roeker here.

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Transcript:

Katherine:                  

We have an audience question. Mike wants to know, “What does it mean to have high-risk CLL?”

Dr. Roeker:                

So, great question, and the interesting thing is that I think the answer to that question is evolving. So, deletion of 17p, deletion of 11q, and TP53 mutation have historically been markers of more aggressive disease or unfavorable CLL. In the era where we only had chemo and immunotherapy, we know that patients had less great outcomes. We know that the treatments tended to not work as well, and patients had disease that tended to come back faster, and things like that.

That’s all evolving in the era of targeted agents. We have some indication that probably patients who have more aggressive underlying disease biology, meaning disease that’s going to behave less well, kind of regardless of what we treat it with, certainly may derive less benefit, meaning that the treatment will work for less long. That being said, these treatments are still really effective for our patients who have traditionally high-risk disease. So, I think it still remains to be seen, in terms of long-term outcomes and what to expect for patients that have these traditionally high-risk characteristics.

Katherine:                  

Let’s run through a few potential results so we can understand how you might approach each patient type. If someone has deletion 17p, what is the approach?

Dr. Roeker:                 

So, there are two totally reasonable frontline treatment options.

So, BTK inhibitors, which are – the current approved ones are ibrutinib and acalabrutinib, are completely a reasonable approach in the frontline setting, meaning the first treatment that someone gets, and those are pills that you take daily. For ibrutinib, it’s once a day. For acalabrutinib, it’s twice a day, for as long as they’re working. And the idea is, with this approach, you keep on those medicines, and they keep the disease suppressed. So, that’s the first option.

The second totally reasonable option is a combination of venetoclax (Venclexta) and obinutuzumab (Gazyva). So, venetoclax is a pill and obinutuzumab is an IV medicine, and the way that this was studied was a total of one year of therapy. So, from the time you start until you’re done with all of your treatments, that’s a one-year course. And the drugs have different side effect profiles, and depending on other medical problems, patient preference about, let’s just take a pill and that’s easy, versus the combination of pill and IV medicines, either can be a completely reasonable choice.

It just depends a lot on patient and doctor preference.

Katherine:                  

What about the TP53 mutation?

Dr. Roeker:                 

So, both of those treatment options seem to work very well for TP53-mutated patients. We had that discussion about the possibility of chemoimmunotherapy for a small minority of patients, and for patients with a TP53 mutation, using chemoimmunotherapy up front is probably not the correct answer. It’s better to go with one of the targeted drug approaches.

Katherine:                  

How would you approach each patient type, if a patient is IGHV unmutated?

Dr. Roeker:                 

So, IGHV-unmutated is the same discussion. Chemoimmunotherapy is probably not going to provide a durable, meaning it’s not going to last for a long time. We’re not going to achieve that potential cure. So, for those patients, either the BTK inhibitor approach, or the venetoclax/obinutuzumab approach is completely a reasonable one to take.

Katherine:                  

And if they’re IGHV-mutated?

Dr. Roeker:                 

IGHV-mutated patients who are young and don’t have a lot of other medical problems, that’s when we add in the third option of chemoimmunotherapy. For many patients, it’s not wrong to choose either a BTK inhibitor or venetoclax/obinutuzumab, but it does add in that third potential option of chemoimmunotherapy.

Katherine:                  

Are there other markers that patients should know about?

Dr. Roeker:                 

So, TP53 mutation status, FISH, and karyotype kind of gets you most of them. Some centers do additional next-generation sequencing of other genes that have been associated with higher-risk disease, though really understanding how to interpret those results still remains somewhat unclear, and that’s still an area of research that people are doing, to really understand what those other mutations really mean for people.

What Does It Mean to Have High-Risk CLL?

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What Does It Mean to Have High-Risk CLL? from Patient Empowerment Network on Vimeo.

What does high-risk chronic lymphocytic leukemia (CLL) mean exactly? Dr. Jennifer Woyach explains the meaning of high-risk CLL, factors in determining disease progression, and the impact on treatment decisions.

Dr. Jennifer Woyach is a hematologist-oncologist specializing in chronic lymphocytic leukemia (CLL) at Ohio State’s Comprehensive Cancer Center – James Cancer Hospital & Solove Research Institute. Find out more about this expert here. 

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Transcript:

Katherine:                  

We have a patient question. I have 17p deletion. Should I be worried?

Dr. Woyach:               

So, 17p deletion is usually associated with more aggressive disease biology almost always associated with that unmutated IGHV. The reason I bring that up is there are a very small subset of patients who have 17p deletion and mutated IGHV who, actually, have pretty indolent or slow growing disease.

People who don’t, which is the majority of them with 17p deletion, do have a shortened time to treatment and shortened survival with most of our current therapies. There have been a lot of advances though in the treatment of 17p deleted CLL. And may of our newer therapies can very much prolong the remission time in the lives of patients with 17p deletion.

Katherine:                  

Dr. Woyach, how do these chromosomal changes affect disease progression and prognosis?

Dr. Woyach:               

So, the markers that are associated with more aggressive disease biology usually are going to be associated with people that need treatment within the first few years after diagnosis, especially those people who have 17p deletion, 11q deletion, unmutated IGHV.

Katherine:                  

What exactly are prognostic factors? Would you define that?

Dr. Woyach:               

Sure. Prognostic factors, and I mentioned three of them, the IGHV, FISH, and the TP53 mutation, are ones that have been studied extensively and shown that the presence of this marker or some change in this marker is associated with a change in the biology of the disease or in the response to therapy.

Katherine:                  

How does the identification of these changes or mutations affect treatment options?

Dr. Woyach:               

Well, right now, we’re lucky in CLL because we have a lot of treatment options. I would say the most important changes when we’re talking about somebody with CLL that is about to start their first treatment is the decision of whether chemotherapy is ever appropriate. So, almost everybody with CLL now is treated exclusively with targeted therapies.                              

So, nonchemotherapeutic options. There are some people who are young, and in CLL terms that means under the age of 65, who have mutated IGHV and who otherwise have good genetic list disease. So, normal chromosomes of the 13q deletion, no TP53 mutation. That small subset of patients, actually, has the potential to be cured with a specific type of chemotherapy. It’s called FCR or fludarabine, cyclophosphamide, rituximab. So, for those young, healthy patients, it’s really important to know those risk factors to know if they are in that group that has that potential for cure.

The converse to that is if patients don’t fall in that group, they probably shouldn’t receive chemotherapy as their first treatment, because it’s not as effective as our other therapies.

Katherine:                  

Yeah. It makes sense.

Dr. Woyach:               

And then, even in the future with first and other treatments with novel therapies, we know that patients with 17p deletion and TP53 mutation tend to have a shorter response time. And so, what I use that for in my practice is I know that those are people that I really have to be sure that we’re following them closely, taking any signs of progression seriously, and always have a back-up plan for what we’re going to do if this treatment doesn’t work.

What Tests Should CLL Patients Insist They Receive?

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What Tests Should CLL Patients Insist They Receive? from Patient Empowerment Network on Vimeo.

Which chronic lymphocytic leukemia (CLL) tests are most critical in CLL care? Dr. Jennnifer Woyach details the key tests, what the tests identify, and how they help provide optimal care personalized to each patient.

Dr. Jennifer Woyach is a hematologist-oncologist specializing in chronic lymphocytic leukemia (CLL) at Ohio State’s Comprehensive Cancer Center – James Cancer Hospital & Solove Research Institute. Find out more about this expert here. 

See More From INSIST! CLL

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Transcript:

Katherine:                  

The goal of this program, Dr. Woyach, is to provide the confidence and tools for patients to advocate for the essential tests to get the best care personalized to them. Are there specific tests that patients should make sure they have?

Dr. Woyach:               

Yeah. In CLL, I would say there are three that are very, very important before starting treatment. The first is something called the IGHV mutational status.

What that is defined as is the changes in the variable region of the immunoglobulin heavy chain. That’s a big mouthful that doesn’t mean a lot to most people. So, I’ll give you just a little background on what that really means biologically and then, what that means clinically. So, every B lymphocyte, so a normal B lymphocyte and a CLL cell, has receptors on the surface of the cell that allow it to interact with the environment. And in a normal B lymphocyte, this is really important for the immune system. So, bacteria, virus, something is in the body and the B cell surface receptor is going to be able to recognize that that’s not supposed to be there and then, do something about it.

In CLL, the surface receptors don’t do a lot of interacting with the outside environment but they’re still present there. And in a normal B cell development, the B cells are initially formed in the bone marrow.

And at the time that they’re formed, every one of those receptors is exactly the same. So, we can do DNA sequencing on those receptors and you’ll see that every one is identical. So, during a normal development of a B cell, it undergoes this process that’s called somatic hypermutation, which is where those receptors mutate or change. And that’s important because then, they can recognize different things. And so, you end up with this whole repertoire of thousands or millions of B cells that all are a little bit different and can recognize something different.

So, CLL cells, they’re all clonally related to each other. They’re all going to have the same receptor on their surface. And about 60 percent of the time that receptor is different than the newly born B cells. And so, this is probably a little bit more simplistic than it actually is. But the way we think about that is that those B cells or those CLL cells, which we call mutated because they underwent that mutational process, we think that that means that they come from a more mature initiating cell.

And they tend to be less aggressive, more slow growing. The other 40 percent of patients, if you look at the receptor on their surface, it’s exactly the same as the new B cells in the bone marrow. And we call those IGHV unmutated because they haven’t done that mutational process. And they behave very differently. So, in mutated CLL, only about half of people will ever need therapy in their lives. An average time from diagnosis to first treatment is about 10 years. In contrast to those patients who have unmutated IGHV, basically, all of those people will need therapy at some point in their lives. And average time from diagnosis to first treatment is about three years.

So, you can see how it really breaks people up into two very different categories of disease.

So, that’s the first test and one that’s really important. That’s also one that doesn’t change during the course of the disease. So, if somebody is diagnosed with mutated CLL, it’s always mutated. So, the next marker that’s important is, actually, chromosome changes. So, we know that there are a few different recurrent chromosome abnormalities in CLL that are common and important prognostically. So, one of these is a deletion of part of chromosome 13. It’s called a 13q deletion. It indicates, again, very slow-growing CLL. Patients how have normal chromosomes also are very good disease biology.

Some people have an extra copy of chromosome 12. That’s called trisomy 12, and that’s an intermediate marker. And then, there are two markers that are associated with a little bit more aggressive CLL. One is a deletion of proto chromosome 11. That’s called an 11q deletion.

And the other one is a deletion of proto chromosome 17 called a 17p deletion. These are all abnormalities that are important to test for. And the way that we test for these is something called FISH testing. And FISH stands for fluorescence in situ hybridization. And it’s a way to use an antibody to look for specific abnormalities in the CLL cells. So, that’s important. And another thing that can be done at specialized centers is something called stimulated cytogenetics. So, I mentioned to you with FISH testing, we’re looking for specific abnormalities with antibodies. But the things that we don’t test for we’re not going to see.

So, if they have a chromosome change that we don’t have an antibody looking at, we’ll never detect it. And we know that patients with CLL who have what’s called a complex karyotype, which is three or more chromosome abnormalities, they also have more aggressive disease.

So, like I said, at specialized centers, we can do what’s called a stimulated karyotype, which is where we look at all of the chromosomes. So, that’s FISH testing and karyotype. And then, the last thing is, actually, doing DNA sequencing for a specific mutation called a TP53 mutation. And TP53 is an important tumor suppressor protein. And it is mutated quite commonly in CLL. About 8 to 10 percent of patients at the time of first treatment and, actually, up to about 40 percent of people later on in the course of the disease. Most of the time, we see TP53 mutations occur at the same time as 17p deletions. About 80 percent of the time, those occur together but they can occur on their own.

So, that’s the third test that’s often helpful, especially prior to starting treatment.

Katherine:                  

Do patients need to be retested over time?

Dr. Woyach:               

Yeah. So, for the TP53 mutation and for FISH, it’s important to test for those before each line of therapy. Because those are so important in indicating disease biology and, specifically, with the 17p deletion and TP53 mutation, those indicate patients that are likely to not have as good of a response to treatment. It’s always important to check for those prior to therapy.