The importance of diversity in clinical trials to obtain the most useful outcomes
Fatima, there’s recently been, appropriately so, more of a push to try and evaluate side effects by racial and ethnic subgroups. I think we’re still pretty crummy at it, but we are making some progress. How important is that to you when you think about patients and managing them?
Dr. Cardoso: I think this is quite important. One area of research that is underused, really, is all the new genomics and sequencing technologies to understand why people react differently to the same treatment. Why is it that for some people, either for ethnic or other reasons, you have a different metabolism or something else that justifies a very high rate of side effects from a certain treatment, whereas in other regions of the world this doesn’t happen?
Not to go into these new drugs, but when using a very old drug like a taxane, I found a difference in reaction between the Portuguese patients and the Belgian patients, the two countries where I’ve worked. I even found that the cause might be genetic because the Portuguese living in Belgium reacted differently than the Belgians themselves.
Maybe there is something in the genetics that justifies the type of side effects that you have. I make a plea also for us to dedicate research to understanding why certain side effects are related to race and others are related to maybe some other types of genetic alterations that will lead to an increased side effect.
Dr. Rugo: Sheila, comments?
Ms. Pettiford: That is just excellent. It’s excellent to even consider it because it is so obvious. To me, it’s an obvious situation because there are things that are underneath the skin that we don’t understand. We have to take that into consideration when we are dealing with all these wonderful – I call them miracle – drugs that have come about in the last 20 years.
There still is much more to be done, and I try to participate in any type of organization that’s encouraging diversity in clinical trials because you need to have people of all different ethnicities in order for us to get to these answers. It’s fascinating that you found this out, doctor.
The patient-centered dosing initiative
Ms. Maués: I have the pleasure of being a member of a patient-led initiative called the Patient-Centered Dosing Initiative (PCDI). We are highlighting the discussion around dosages of drugs, especially in the metastatic setting. Metastatic breast cancer is what we’re focusing on, although it could apply to any type of cancer. We are advised by a number of wonderful, world-renowned physicians, Dr. Rugo being one of them. Anne Loeser, the leader of our group, has spoken at ASCO about this topic of dosage. What we’re seeing is that the dosage determination for oncology drugs is still done in the same way it used to be done decades ago and mostly with the curative intent of early-stage disease — metastatic cancer patients back then really didn’t live long at all. What we’re seeing right now is people with metastatic breast cancer that are able to, in some cases, live a long life managing their disease.
Patients are put on doses that are too high for them to be able to manage the side effects, and then they end up having to go off the drug, which means they have lost one of the tools in their toolbox. So, what we like to say about dosing is that, for metastatic cancer patients, it’s a marathon and not a sprint. If we throw all the poison at the patient from the very beginning, they won’t be able to take this for a very long time. And in the metastatic setting, the goal is to stay on each therapy for as long as possible. If we burn one of the cards early on, you have to move on to the next one. This is finite because at some point, there are not enough drugs that can help a particular patient. The PCDI is really getting a lot of visibility with the FDA and experts. People are talking more about dosages, and the FDA is now providing guidance for pharmaceutical companies to study different dosages in the clinical trials from the very beginning. This initiative is almost 3 years old, and we have made a tremendous impact since then.
Dr. Rugo: I think this is an incredibly important area moving forward, and thankfully, there’s so much interest now in not only promoting diversity, enrollment in trials, and education to promote diversity but also in looking at differences in efficacy and side effects.
I’ll just thank everybody for your contributions and amazing perspectives in this incredibly important area. As we move forward with better agents, we need to also make sure we’re understanding what the side effects are, managing them, and hearing the voices of our patients. Thanks very much.
Ms. Pettiford: Thank you so much.
Dr. Cardoso: Thank you.
Ms. Maués: Thank you.