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Prostate Cancer Research: Updates From ASCO 2023

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Prostate Cancer Research: Updates From ASCO 2023 from Patient Empowerment Network on Vimeo.

Expert Dr. Channing Paller shares prostate cancer research news, including updates on the PEACE-1 and STAMPEDE clinical trials, FDA treatment approvals, PARP inhibitors, PSMA-targeted imaging, and educational resources.

Channing Paller, MD is the Director of Prostate Cancer Clinical Research at Johns Hopkins Medicine. Learn more about this Dr. Paller.

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Transcript:

Katherine:

Dr. Paller, in June, prostate cancer researchers from around the world met to discuss their findings at the annual American Society of Clinical Oncology, or ASCO meeting, in Chicago. Would you walk us through the highlights from that meeting that patients should know about? 

Dr. Paller:

Absolutely. 

We’ve had a exciting time for prostate cancer in June. So, I’d say, the first thing I would bring up is, the PEACE-1 trial was discussed again, and more data came out from that trial. That trial originally supported what we found, the STAMPEDE trial, to say, yes, we should add abiraterone (Zytiga) to androgen deprivation therapy and chemotherapy in helping de novo metastatic patients live longer and do better overall. And it also, this time around, showed us that combining abiraterone with radiation, plus or minus chemo, had patients do better. So, they had a longer progression-free survival, or metastasis-free survival. 

And also, the neat thing was, patients had fewer local symptoms in the long run. So, it prevented catheters being needed later, prevented blockages. It prevented local side effects from their cancer, which was really terrific to know, because that helps with patients’ quality of life. 

That was one of the main, personally. Go ahead. 

Katherine:

Yeah, I was just going to ask, anything else? 

Dr. Paller:

Yes. So, the second big headline, which is one of my dear loves, is all of the PARP inhibitor data. So, there were a couple trials presented, and this month has been terrific in terms of, there have been two drug approvals. So, let me talk through a couple of those. 

So, one of the big ones that was presented at ASCO was looking at talazoparib (Talzenna) and enzalutamide (Xtandi) in patients with metastatic castration-resistant prostate cancer, and it showed that the combination of those two drugs helped patients do better than enzalutamide alone, in that setting. What was also interesting is a subset of patients with DNA repair mutations did even better. 

June 20th, the FDA approved that combination for patients with metastatic castration-resistant prostate cancer with DNA repair mutations. (Lynparza) in the same space of metastatic castration-resistant prostate cancer for patients with BRCA mutations. That was a more narrow approval, but it was still very important. 

And what’s exciting here is, we’re really learning more about targeted therapy, precision medicine, for our prostate cancer patients. When I started treating prostate cancer patients back in 2005, the main drug approved was chemotherapy, docetaxel (Taxotere), and hormone deprivation therapy. And in the last almost 20 years, or 18 years, we’ve had 10 drug approvals, and we’re really starting to have multiple drugs approved based on people’s genetics.  

Katherine:

What is advanced prostate cancer? And is any of the research you mentioned focused on this stage of disease? 

Dr. Paller:

Well, advanced prostate cancer includes any prostate cancer that was extended outside the prostate, really, that’s spread to the nodes, even to the lymph nodes, to the liver, to the lungs, to the bones. And so, we have a lot of new findings, looking at this space, and that was a lot of what they showed at the ASCO conference. 

The other thing we’re learning is that we really want to get genetic testing on everybody. And so, in addition to your regular, “How do you feel?” “What do your labs show?” “What is your PSA doing?” 

We also want to get imaging, right? So, we want to look at imaging, in terms of, what did your CT and bone scan show? And nowadays, we’re moving into PSMA, or prostate-specific membrane antigen, PET scans. 

And so, that’s the new main way people look at where their prostate cancer has gone, and help them decide, what is the best treatment for me? Is it to get surgery locally, or has it advanced now, and I really need to do hormone therapy and radiation, or some other combination of systemic therapy, meaning more hormones, or more chemotherapy, with targeted therapies such as radiation? 

Katherine:

Beyond ASCO, Dr. Paller, are there other research or treatment advances that patients should know about? Anything other than what you’ve mentioned already? 

Dr. Paller:

Oh, yes. So, the other headline that I was really excited about at ASCO is watching medicine adopt the world of artificial intelligence. There was a great abstract, looking at how we can use artificial intelligence to look up pathology slides. 

So, in the past, we would always want to go to a top academic center to have your pathology reviewed by a top expert and make sure we were treating the right cancer, and make sure we really understand your risk. What we’re finding is, we can create biomarkers, and we’re understanding not just genetic, genomic biomarkers, but also pathology biomarkers, and age, and PSA, and risk, and comorbidities, and we can combine them all together and use AI to help us better stratify patients. 

And so, although it’s early, I think this is going to be an explosion in terms of helping us better define risk for patients in advanced prostate cancer, and help them figure out, do they need intensification of treatment, or can we de-intensify treatment? Can we not cause as much toxicity, and they’ll do just as well? And so, I was really excited to see that data as well. 

Katherine:

How can patients stay up to date on evolving research? 

Dr. Paller:

There are many ways to stay up to date. There are nice summaries at ASCO. There are nice summaries through the Prostate Cancer Foundation. There are good summaries at each of the institutions with whom you work. 

One of my favorite ways to stay up to date on precision medicine is one of these registries that I am co-leading, which is called the PROMISE registry. This is a wonderful opportunity which was conceived in the pandemic. 

And so, it’s pandemic friendly, and that is called the PROMISE registry. And what you can do is go to prostatecancerpromise.org and sign up if you have prostate cancer. And you say, “Hey, I have prostate cancer. This is my address. Please ship me a kit where I can do saliva testing of my genes.” And once you get your tests sent in, they’ll send you a kit, you send it back, you’ll get an email, and you can go over your results with a genetic counselor. 

And then, once you get enrolled in this program, it is really just a free information source. And so, you can learn more about the clinical trials around the country for patients with different mutations. And so, I love that as, whether or not you have a mutation and you’re going to follow with us for 20 years, because we’re going to offer you opportunities and let you be the first to know about new drug approvals, you can still hear about all of the new research. 

And I think that’s a wonderful, free resource that we’ve done for our patients to help them understand more about what’s out there. Another opportunity to learn more about prostate cancer is the prostate cancer clinical trial consortium. They have a nice website looking at germline genetics, looking at diversity, looking about clinical trial design. And so, there’s lots of different places to learn more about prostate cancer. 

Advanced Prostate Cancer: David’s Clinical Trial Profile

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Advanced Prostate Cancer: David’s Clinical Trial Profile from Patient Empowerment Network on Vimeo.

Prostate cancer patient David received a diagnosis at stage IV during a routine PSA check. Watch as he shares his prostate cancer journey, his experience with clinical trials and treatments, and his advice to other patients about lessons learned about prostate cancer side effects and the impacts of clinical trials.

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Transcript:

David: 

Hello, my name’s David. I am 58 years-old.I was diagnosed in 2016 with prostate cancer, I had no actual signs or symptoms of prostate cancer, it was only found due to Army doctors, I had something wrong with me, which had nothing to do with the cancer. They did a PSA check, and my PSA came back at 1050, where it should be around 0. From that I then got sent to a local hospital where I had tests, I had biopsies to open my prostate, which found out I had stage IV prostate cancer. 

From there I got asked would I like to go to the Christie County Hospital in Manchester, UK. From there, they offered me the trial called the STAMPEDE trial. This trial was used in different procedures, which is already around, we use them together to try and extend people with prostate’s life. I got to turn the arm where it was also attached with chemotherapy, followed by 20 sessions of radiotherapy. This happened over three, four months, which after that brought my PSA down, but only to round 20 odd. From this after a couple of months, my PSA started to rise fairly quickly. I then got put onto the drug called bicalutamide (Casodex). This lasted a couple of months, because my cancer is so aggressive, it started to grow. I then got put onto another chemotherapy, cabazitaxel (Jevtana). After my first session of the cabazitaxel, I then got a CT scan and from this we found out the growths were still growing. 

So after this, I then got put on a drug called abiraterone with [inaudible] which is a stand-only. I was on this for 22 months, which was very good, it brought my PSA down to eight, which is as low as it’s ever been. Like I say, it lasted 22 months, but then the cancer started to come back quite a bit, so my oncologist actually said there’s no actual normal treatment left for me, and asked would I like to go on to trials, clinical, a first stage clinical trial, right away I said yes. My first clinical trial was a Carrick called Carrick, this lasted six months, but again, the cancer started to grow again, so I came off of this. I then have four weeks, no trials at all. It’s what called a clean-out where you can’t have any drugs at all in between trials. I then went on to what was called task 368-1, this lasted longer which lasted seven months. That again, the cancer starts to grow again. So, then I got on this one called CellCentric For the the CellCentric trail, they put you back on to abiraterone, which normally you don’t, wouldn’t take past one to two months… for me, it’s carried on working again. It’s now on seven months of working until it stops working, I can’t go on the new drug called CellCentric. 

For me, this is cool because it’s still working, the old drug, and it’s a very…let’s say there’s not a lot of side effects except for what steroids [inaudible]. So at the moment, we’re just seeing how it goes. I have scans every eight weeks, a CT scan and a full body scan from each time they come back, they then decide what’s happening next…and that is my journey up to now, which is five-and-a-half years later. 

With the clinical trials, I feel really good at the moment, because as I said, the trial [inaudible] and abiraterone (Zytiga) is not a drug that causes a lot of side effects. Through other trials have been, they are very intense, and that’s what they always warn people, which are overnight stays when you first take the drugs, so they are very tiring, you have to have blood done overnight all the way through the night, you get BCGs to make sure your body is not reacting to the drugs, and then the side effects of the drugs after.  So, they are very intense, but also, I am still here, I did not expect to be here. October, this year October I got told I would not be here three years ago, so it shows what clinical trials can actually do for you.  I’m still here, I still live a very good life. We go walking, the wife and I quite often, and we did three, four-mile last night, and we just enjoy our lives. 

People don’t realize…a lot of men don’t talk about it the physical side and the sexual side of prostate cancer, the treatment, because your libido to go, and it just causes a [inaudible] of your testosterone. You don’t feel like…and it’s a closeness that you lose… Amanda’s been unbelievable, she’s been there for me all the way through. She’s my rock, she’s the one went down down, she pushes me, but then she has days where she’s down. And this is where people need to realize the partners will improve the encounters much as the patient. And this is some of them we talked about…we’re very open about people where we talk about it. We have our days, the last couple of days I’ve been down. But she’s there to try and help me get back, and I try and do it for her when she is…and the family is the same, having the family support, when I’ve been to appointments, I get phone calls, quite a few, I get messages how are things going. And it’s just nice knowing that people do care, we have friends who keep in touch all the time, make sure everything’s okay, and you need that support of your family and friends. 

It’s very important for them to be there with you. 

The clinical trial to me is drugs that normally are not being used on humans before. They’ve only been tested in the laboratories. So, the first stage is a dosage stage where they check in and see what a person can actually take…so different people have different amounts of the dose.  And then from there they go to the expansion stage, and that is when they bring more people, and they know what dose to give people. Well, it’s to find new drugs, which can help other people in the future, as well as myself…I always say to myself, “This could help someone in the future, live for longer, stay longer with their family, be there longer.” It’s helping me other months, as I say, but it’s also to help other people in the future, something that’s not been used with people before.  

What I would say to other people who are thinking of going on clinical trials and the families is go for it. They are done so carefully, you’re checked all the time, your bloods are checked, your health is checked, your [inaudible]. It’s something that you can stay longer with your family. There could be cures in the future with this as well, no one actually knows, and it’s something people should not be scared of doing. Like I said, I’m on my third trial, and I will keep on going, I know there are more trials for me after this. And I will keep on going. 

Treatment Options for Advanced Prostate Cancer

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Treatment Options for Advanced Prostate Cancer from Patient Empowerment Network on Vimeo.

What are treatment options for advanced prostate cancer? Expert Dr. Maha Hussain provides a breakdown of hormone therapy and explains how targeted therapy is used in prostate cancer care.

Dr. Maha Hussain is the Deputy Director of the Robert H. Lurie Comprehensive Cancer Center of Northwestern University. Learn more about this expert here.

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Transcript:

Katherine:

Now that we understand how test results can help inform a patient’s cancer and how it may behave. Let’s discuss how they can affect treatment options for men with advanced disease. First, let’s do a brief review of the treatment types currently available. There’s hormone therapy, right. What else?

Dr. Hussain:

Perhaps, it’s simpler if we focus on advanced disease, specifically metastatic disease.

So, if that’s the deal, then the backbone of treatment is hormone treatment. And it really is. We call it hormone, but technically it’s an anti-hormone. What we’re trying to do is shut down the hormonal pathway that stimulate the testes, which is the factory that makes testosterone. So, we are looking at shutting down testosterone production from the testes in order to starve the cancer.

Now, the male hormone is produced predominantly – somewhere about 95 percent of it is made by the testes, and then there are about 5 percent-ish that comes from other sources. These are, again, male hormones like the adrenal gland and so on. And there was a while ago some research – I want to say from the MD Anderson crowd, but this is two years ago – that suggested also that the tumor may start to make sort of in-house production of male hormone to support itself.

Now, having said that, again, testes continue to be the source of the majority of the male hormone. And so, historically, the first data that showed benefit was actually by surgically removing the testes, which is what we call orchiectomy or bilateral orchiectomy. And then medications began hitting the market and were evaluated in the late ’80s and then 1990s, beginning with Lupron – which by the way, in the ’80s, it was an injection that the patient had to give themselves every day, which is remarkable.

But even then, there is a personal preference by patients to go and take injections as opposed to go through surgery with orchiectomy. But still, I would say for some patients it may be an option until it ought to be discussed as an option. Then what we know is this, is because of the

potential other sources for the male hormone, the concept of what we call combined androgen depravation was being evaluated.

And again, this goes back to the ’80s when the first drug was flutamide and then bicalutamide, and there are other drugs that became. And they kind of added a sprinkle, I call it, to survival. But it wasn’t dramatic, huge differences in survival. And so, generally, while we used it, everybody believed in using it. Moving forward, the drugs like abiraterone, enzalutamide, apalutamide are the three hormonal drugs that have demonstrated conclusively really an advantage in terms of prolonging life when added to the Lupron.

So, what I tell my patients is that, when it comes to hormone treatment there is really no way around it. You can delay it. Some people are exploring for some patients who don’t have a lot of cancer, maybe a couple of areas, maybe just do targeted radiation and then leave the person alone to buy them some treatment-free time.

And, to me, this is where the discussion that has to happen with the patient. What is the objective? Is the objective to kind of be ahead of the game and maximally treat the cancer with the hope of prolonging life? Or is the objective to delay treatment? And I would tell you that, with these types of conversation, nine out of 10 or 9.5 out of 10 men opt for moving aggressively up front with management. So, that’s that.

Now, the one thing I should point out, one of the trials that also was a landmark trial in this disease was the study CHAARTED, which was an intergroup clinical trial at the time it was designed, led by ECOG, and the PI was Dr. Chris Sweeney. I was part of the team that worked on the design also of the study.

And that was a trial that looked at adding docetaxel to hormone therapy, versus hormone therapy alone, to try to see if it adds something. Historically, all the chemotherapies prior to that that were added to hormone treatment for patients with newly diagnosed metastatic disease had not delivered. And docetaxel did.

However, one thing I should point out, based on that trial – and I don’t want to go into too much details for the sake of time – the patients that seemed to be benefiting were the patients that had more aggressive, more disease in their system. And so, liver metastases, lung metastases spread in the bone at different areas, not like few isolated areas in the spine or the pelvis, but much more than that.

And so, for the patients who have what we call high-volume prostate cancer based on scans – and I’m happy to explain what that means if it’s needed – these are the patients that I would offer either the docetaxel plus hormone treatment, which is the injection, or the injection plus the hormonal pills that I mentioned earlier.

Katherine:

What about targeted therapy? How is that used?

Dr. Hussain:

Okay. So, let’s begin with the molecularly targeted therapy. So, as we speak right now, for patients who have newly diagnosed metastatic disease that we call hormone-sensitive, molecularly targeted therapy is not standard of care. So, I would encourage patients who may qualify for clinical trial to be involved in those. The flipside is – we can talk about it – is that molecularly targeted therapies, specifically with PARP inhibitors have pretty much entered in the space of prostate cancer with a couple of drugs that were FDA-approved.

The other way of targeted treatment, which would be what we refer to targeted radiation, this would be a different story. This is not systemic treatment. This is a local treatment. And what is done is basically if patients do not have a lot of cancer in their body based on scans, and only certain areas, and they are starting systemic therapy, they can certainly consult with a radiation oncologist to target radiation to areas that are visible on scan. So, if somebody has a couple of, let’s say, pelvic bone lesions, maybe a lymph node, and they are already starting systemic therapy, they can consult with a radiation oncologist focal radiation. And so, that would be the general scheme.