Mar 26, 2015

One Size Fits All—Right Now, But, What If…

The typical clinical trial today involves hundreds or even thousands of volunteers who are fairly similar (have the same cancer with similar stage and similar prior therapy and maybe even similarities in general health). Then two treatments are compared to each other in this large group of patients. If one treatment fares better than the other, that better treatment becomes the new gold standard treatment. That’s good. That’s progress! But it’s certainly not perfect.

So what about the individual patient?
What is lost in this process is knowledge about how these treatments affect individual patients; for example, you. The average benefit seen in a clinical trial is not shared equally by all participants. Some patients are fortunate to have cancers that are particularly responsive to available treatments and these patients may benefit a great deal. Others may benefit a little less and some may not benefit at all. A few may even be harmed by the treatment as they experience unpleasant side effects along with little or no effectiveness.
A clinical trial treatment is judged by how it performed in the entire group of participants and not as much by how each individual patient responded. Over the years, this approach has saved countless lives. In most cases it’s the best we have at the present time. What about the future? What’s on the horizon?

The Big Three New Directions
1 Targeted Therapy. More and more cancer drugs are designed to target specific defects that occur only in cancer cells and not in the normal human body. This is the same process used in creating antibiotics that attack the bacteria and not the human. As a result, antibiotics have been enormously successful. It has been far more difficult to figure out what makes a human cancer cell uniquely different from the regular human cells that it came from. But drugs are now being designed to exploit these newly discovered Achilles’ heels of cancer. For example, Imatinib Mesylate (aka Gleevec) (developed at OHSU) was one of the first such drugs to become mainstream, revolutionizing the treatment of Chronic Myelogenous Leukemia as well as several other cancers.
Targeted drugs have a good chance of being both more effective and less toxic than most drugs currently in use. Targeted drugs are also more amenable to individualized therapy. Since these drugs have a specific target, it is possible to develop tests that examine the cancer and determine if that particular target is present in a specific, individual patient.

2 Personalized Therapy. More clinical trials than ever before are asking patients to consider a biopsy of their cancer as part of the research. For cancers that circulate in the blood this may be possible with just a simple blood sample. In other cases a needle biopsy might be needed to get a sample. Don’t be surprised if you get such a request when you’re contemplating a clinical trial. These tumor samples are being used to better understand which cancers respond to which treatments. Fear of needles aside, this is a good and progressive step in conducting clinical trials and providing benefits for all those with cancer!
It is likely that in the future the multi-thousand patient clinical trials that seek to measure benefit in the entire group may be replaced by smaller studies that focus on subgroups of cancers that have specific treatable defects.

3 Pharmacogenomics. Not only can we not now tell in advance who will benefit from which treatment, we are equally unable to predict who will develop serious side effects. Matching drugs to cancers will require careful biologic analysis of the tumors. Predicting, and therefore avoiding, side effects will require a careful biologic analysis of the whole human being.
While our individual differences are not due only to genetics, many of our differences and those things that make us unique are coded into our DNA. We expect that hidden within that code is the ability to predict how the body will react to various medications and treatments. In the future, we hope to be able to perform very sophisticated laboratory tests that will enable us to predict which treatments will result in the greatest benefit and do the least harm to each individual patient‑‑and for minimal cost. Let’s hope this all happens sooner rather than later!

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To put a smile on your face see Larry's latest cartoon.
To learn more about clinical trials, take a look at our book.

(c) 2012 Tom Beer and Larry Axmaker

Mar 9, 2015

Cancer and Clinical Trials—by the numbers

Every once in a while we find it helpful to take a step back from clinical trial results, experimental drugs, and finding a clinical trial to look at some other cancer information. Today it’s taking a look at the big picture—the numbers, or as close to the facts as we can get. 

In the Wide, Wide World
This year 9,000,000 people worldwide will die from cancer and the number is rising. That is 13% of all deaths. The U.S. ranks 58th in the rate of world cancer deaths. That means 57 countries have lower rates of cancer deaths than we do. The rates are much higher in Poland and Hungary and much lower in Mexico, Iran and many other countries. 

There are growing numbers of people in the world with cancer. How can this be with all the improvements we have made in diagnosis and treatment? Well, there are more and more older people throughout the world. The number one risk factor in getting cancer is to get older. And, more people are living longer with cancer. Then there are factors like pollution and smoking, which is still very popular around the world.

Close to Home
14.5 million living Americans have or have had cancer. 1.6 million more will be diagnosed this year and 589,000 will die from cancer. And, of all those individuals, only about 3% (42,000) will ever volunteer to participate in a clinical trial. You can help improve that statistic!

In the U.S. the 5-year cancer survival rate for all cancers was 49% in 1977. It is 68% today—and much higher for some cancers such as prostate (99%). Earlier diagnosis, better treatment, and lower smoking rates have helped. The most common cancers in the U.S. are breast, prostate, and lung. Breast and prostate cancer have high survival rates, lung cancer has a very low survival rate‑‑still.

Over a lifetime your chance of getting cancer of any kind is 37% if you are a woman and 43% if you are a man. You can avoid some cancers (stay out of the sun, don’t smoke) but others seem to just happen. 

How About some $ and Sense?
Cancer is expensive. In the U.S., cancer treatment costs exceed $88 billion each year. Half of that is for Doctor and out-patient Hospital costs. 35% is for in-Hospital treatment and 11% is for prescription drugs. That’s a lot of money to help us stay alive. And costs are going to increase.

Cancer is very common, horrible, expensive, and unpredictable. The numbers in this article won’t cure you, probably didn’t surprise you, and will not likely change any of your behaviors and choices. But you never know…


Post Text Here
To put a smile on your face see Larry's latest cartoon.
To learn more about clinical trials, take a look at our book.

(c) 2012 Tom Beer and Larry Axmaker