The ABC Guidelines discuss tough clinical situations. Can you explain?
The guidelines also discuss issues that in clinical practice are quite difficult because we don’t have strong data. There are certain tough clinical situations. One example is how to treat a woman who has metastatic disease and is pregnant. We discuss the possibilities of treatment in that situation and also what other support these patients need. We discussed that the only available therapy we can use is chemotherapy. We cannot use endocrine therapy, nor biological agents such as anti-HER2 agents and immunotherapy. So, this raises a lot of concerns for how to treat these women without hurting the fetus. But in these guidelines, we discuss other needs of these patients. It’s a hot topic in the US and we did issue a recommendation: that in some situations where the life of the mother may be at risk because we are not able to provide the most adequate treatment, then they should be free to choose to terminate the pregnancy.
It is important to realize that you can’t give most of the new treatments — and ones that have an impact on survival — to a woman when she is pregnant.
What other tough clinical situations do you discuss in the new guidelines?
We discuss someone who has metastatic disease and is HIV-positive. Can we use CDK4/6 inhibitors? Can we use immunotherapy? What are the recent data? We have very little data to show that we can possibly use immunotherapy, but we do not have any safety data regarding the CDK4/6 inhibitors.
It’s important to note that people who are HIV-positive tend to have a worse mortality rate from cancer and also suffer from more toxicity. Very often, there is a need to reduce the doses of the treatments we are going to give. The guidelines provide guidance on these issues so that in clinical practice, doctors can have some help managing these difficult situations.
Another example of a tough clinical situation is how to treat an elderly, frail patient who has metastatic disease. We discuss what geriatric evaluations you need to perform before deciding the treatment. We discuss the need very often to reduce the starting dose and then adapt according to what the patient can tolerate.
We have discussed quite a lot of topics that are really patient-oriented and clinically oriented. The aim is to help everyone in clinical practice to provide the best available care.
Do you want to expand a bit on the elderly, frail patient and what you have in the guidelines about that?
A very important message is that it doesn’t matter what age your ID card says; it’s the biological age that is important. There are some people who are in their 80s, but they are very fit and they have a very active, normal life. There are other people who are in their 50s and they struggle. It’s important to perform a geriatric evaluation to determine the probability of tolerating a cancer treatment, and we normally use a simple tool called G8. If this tool shows fragility, then it is crucial to have a full geriatric assessment and a full physical exam.
It’s also very important to look for drug-drug interactions in the elderly because these patients often take many different therapies for other diseases.
Another issue is chronic undertreatment in the elderly. If you look just at chronological age and you don’t provide the optimal treatment, there will be increased mortality.
We also recommend starting elderly patients on a lower dose. There are not strong data for that, but we think it is clinical common sense to start at a lower dose. Then, if there is good tolerance, you can move to the usual dose.
Often, the elderly are excluded from clinical trials. Some of the clinical trials for some of the newer agents have included elderly patients. For example, there were some elderly patients in the CDK4/6 inhibitor trials. We know that these patients can receive these treatments with a reduction in dose.
Very frail elderly patients are often excluded from clinical trials. If we continue to do that, we will never know how to treat them.