Cushing’s Syndrome Epidemiology

By Yolanda Smith, BPharm

Cushing’s syndrome is considered to be a rare disorder that results from prolonged exposure to glucocorticoids. However, there are few epidemiological studies to provide adequate data to describe the incidence and prevalence of the condition accurately. Most cases are diagnosed between the ages of 20 and 50, although any individual may be affected at any age.

The presentation of the symptoms of Cushing’s syndrome can vary greatly. In addition, many of the symptoms overlap with those caused by other health conditions, such as metabolic syndrome and polycystic ovary syndrome. This can make the diagnosis of the condition difficult. It is also difficult to establish epidemiological trends in Cushing’s syndrome, because not all cases of the disease are diagnosed. However, it is important that diagnosis is made as soon as possible, because early diagnosis and treatment of the condition are associated with improved morbidity and mortality rates.

Population-based Studies

There are several population-based studies that have reported the incidence and mortality rates of Cushing’s syndrome in certain populations over a discrete period of time.

A study in Denmark followed 166 patients with Cushing’s syndrome for 11 years, finding an incidence of 2 cases per million population per year. Of the 166 patients, 139 had benign disease. There was a mortality rate of 16.5% in the follow-up period of 8 years, with most deaths occurring in the year after the initial diagnosis, often before the initiation of treatment. The causes of death of patients with Cushing’s syndrome in the study included severe infections, cardiac rupture, stroke and suicide.

A study in Spain found 49 cases of Cushing’s syndrome over a period of 18 years, with an incidence of 2.4 cases per million inhabitants per year and a prevalence of 39.1 cases per million. The standard mortality ratio in this study was 3.8, in addition to an increase in morbidity rates.

Incidence

A low incidence of endogenous Cushing’s syndrome was established by the population-based studies outlined above, corresponding to approximately 2 cases per million. Some studies have an estimated incidence as low as 0.7 people per million.

However, the incidence of subclinical Cushing’s syndrome may be underestimated in certain population groups, such as those with osteoporosis, uncontrolled diabetes mellitus or hypertension. For example, of 90 obese patients with uncontrolled diabetes mellitus in one study, three had Cushing’s syndrome. This yielded a prevalence of 3.3%, which is considerably higher than the incidence reported in the population-based studies. However, these findings should be supported by larger studies.

Females are more likely to be affected by Cushing’s syndrome than males, with a risk ratio of approximately 3:1. There does not appear to be a genetic link that involves an ethnic susceptibility to the condition.

Treatment Outcomes

Surgery is the first-line treatment option for most cases of overt disease and remission is achieved in the majority of patients, approximately 65-85%. However, for up to 1 in 5 patients the condition recurs, and the risk does not appear to level off, even after 20 years of follow-up.

The risk of mortality for individuals with Cushing’s syndrome is estimated to be 2-3 times higher than that of the general population, based on epidemiological studies.

Reviewed by Dr Liji Thomas, MD.

From http://www.news-medical.net/health/Cushings-Syndrome-Epidemiology.aspx

Young people with Cushing syndrome may be at higher risk for suicide, depression

Children with Cushing syndrome may be at higher risk for suicide as well as for depression, anxiety and other mental health conditions long after their disease has been successfully treated, according to a study by researchers at the National Institutes of Health.

Cushing syndrome results from high levels of the hormone cortisol. Long-term complications of the syndrome include obesity, diabetes, bone fractures, high blood pressure, kidney stones and serious infections. Cushing’s syndrome may be caused by tumors of the adrenal glands or other parts of the body that produce excess cortisol. It also may be caused by a pituitary tumor that stimulates the adrenal glands to produce high cortisol levels. Treatment usually involves stopping excess cortisol production by removing the tumor.

“Our results indicate that physicians who care for young people with Cushing syndrome should screen their patients for depression-related mental illness after the underlying disease has been successfully treated,” said the study’s senior author, Constantine Stratakis, D(med)Sci, director of the Division of Intramural Research at NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development. “Patients may not tell their doctors that they’re feeling depressed, so it’s a good idea for physicians to screen their patients proactively for depression and related conditions.”

Cushing syndrome may affect both adults and children. A recent study estimated that in the United States, there are 8 cases of Cushing syndrome per 1 million people per year.

The researchers published their findings in the journal Pediatrics. They reviewed the case histories of all children and youth treated for Cushing syndrome at NIH from 2003 to 2014, a total of 149 patients. The researchers found that, months after treatment, 9 children (roughly 6 percent) had thoughts of suicide and experienced outbursts of anger and rage, depression, irritability and anxiety. Of these, 7 experienced symptoms within 7 months of their treatment.

Two others began experiencing symptoms at least 48 months after treatment.

The authors noted that children with Cushing syndrome often develop compulsive behaviors and tend to become over-achievers in school. After treatment, however, they then become depressed and anxious. This is in direct contrast to adults with Cushing syndrome, who tend to become depressed and anxious before treatment and gradually overcome these symptoms after treatment.

The authors stated that health care providers might try to prepare children with Cushing syndrome before they undergo treatment, letting them know that their mood may change after surgery and may not improve for months or years. Similarly, providers should consider screening their patients periodically for suicide risk in the years following their treatment.

Source: NIH/Eunice Kennedy Shriver National Institute of Child Health and Human Development

Cushing’s on Capitol Hill: Cushing’s Awareness Challenge

Earlier this year, I got this email:

Good morning Mary:

I hope everything is well.

I would like to invite you to join us at the Rare Disease Congressional Caucus briefing scheduled for April 2013. The final date is still being discussed but we are looking into two possible dates of either April 16th or April 18th. The meeting will take place in Washington, D.C. and will be attended by members of the Rare Disease Caucus including co-chairs Rep. Joseph Crowley and Rep. Leonard Lance.

As you may know Rare Disease Congressional Caucus is a forum for members of Congress to voice constituent concerns, share ideas, and build support for legislation that will improve the lives of people with rare diseases. The goal of the meeting in April is to educate the members of the Caucus about rare pituitary disorders, including Cushing’s Disease – area that has received little to no recognition among legislators. The meeting will serve as an opportunity to raise legislators’ awareness about multiple issues that patients with rare pituitary diseases, such as Cushing’s disease and Acromegaly, face in their everyday lives.

In preparation for the meeting we drafted a Resolution that addresses some of the key challenges for the patient community including long diagnostic delays, limited treatment options, difficulty finding physicians or treatment centers with expertise in their disease and as a result – a  diminished quality of life for patients. Would you be willing to have a look at the draft in the attachment and provide your feedback? Your opinion as a leader of the patient community and expert in Cushing’s disease would be highly appreciated.

I sincerely hope that you will be able to join us at the meeting to share your perspective and talk about the work that you are doing to help patient afflicted by Cushing’s disease live happier and healthier lives.

Please feel free to call or email anytime if you have questions or if you would like to discuss this further. I look forward to hearing back from you soon.

Attached to the email was the House of Congress Resolution.  Read it here.

I got back quite quickly and said that I would love to attend.  If it was on the 16th, I could go, no problem.  If it was the 18th, probably not because I had plane tickets that day to attend the Magic Foundation Conference in Las Vegas.

In late March, I needed to make my final decision on Las Vegas.  I had been waffling about that trip for a while since my husband had surprise triple bypass surgery in late January.  When I made the decision not to go, he still couldn’t drive or walk the dog – and I was just afraid to leave him alone for 5 days.

caucus1

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As it turned out, the date was a non-issue since the Congressional Caucus would be on the 16th.

April 15 was a terrible day as news of the Boston Marathon came in.  Security was stepped up in several cities, including Washington, DC.

I looked online to see if the Caucus would be cancelled and found out that the 16th was Emancipation Day in DC – and the main route that I would take to get there would be closed for a parade.

I was already getting very nervous about the whole thing and not knowing how to get there added to the stress levels.

I had my talk printed out with 3 different places to stop, depending on the time.

We left about 10AM for a noon meeting.  I’d decided to park at the train station and take a taxi to the Rayburn House Office Building.

When we got to the Rayburn Building, there was a long line of folks waiting to get in.  I don’t know if they only open the front door at certain times but when the line started to move, it went fairly quickly.  They took 5 at a time through security then we were on our own to find out where to go.

It turned out that our meeting room – 318 – is the room usually used for the Ways and Means Committee.  We got there just about 11:30.  Robert Knutzen from the Pituitary Network Association was already there as was Alexey from Novartis.  Alexey said “Mary?” and I said “Alexey?” and we introduced ourselves.  I already knew Bob from several past meetings so the four of us just chatted a bit while others started arriving.

I had brought quite a few Cushing’s brochures with me and had planned to hand them out to people but Julia from the RDLA (Rare Disease Legislative Advocates) showed me a table where I could leave them for folks to take on their own – and quite a few did.  If they read them, that’s another story!

Right around noontime, lots of people came in.  Some were staffers gathering information to take back to their offices, many others were from rare disease organizations, a few were legislators.  It was standing room only and we estimated there were maybe 120-140 people there.  Only two were known pituitary patients:  Bob with Acromegaly and me with Cushing’s.  Bob mentioned the statistic again “1 in 5” so at least 24 others in that room should have had a pituitary tumor…

Representative Leonard Lance (NJ) spoke a bit about the need to recognize rare diseases in this country.  He mentioned that there were 7,000 rare diseases and it was important to focus on getting awareness for patients with them.  This Caucus focused on the pituitary, although only 2 pituitary diseases were represented.

Vijay Iyengar, Vice President the Rare Disease Franchise of Novartis oncology talked about their two drugs to either cure disease or improve quality of life through a  3-pronged approach:

  • Targeted research
  • Open collaboration
  • Patient inspired solutions

Novartis created the Rare Disease Franchise was recently created as a means of strengthening their involvement and has two drugs with FDA approvals, one for Cushing’s and one for Acromegaly. Their Acromegaly drug is 25 years old and their newest, Signifor, was approved on the anniversary of the discovery of Cushing’s Disease (December 2012) and three new applications are in the approval pipeline.

These diseases are rare because not many people have them and not much knowledge is available about them.

He also said he needs collaborative partners, particularly with Cushing’s.  He would like to have Clinical Trial centers.  However, usually enough patients are near one or two centers.  With Cushing’s, there would need to be 40 or more centers.  We talked to Vijay after the Caucus about this and connecting his company with Cushing’s patients.

Emily Acland, although not a Cushing’s patient, summed up some of the symptoms based on her contacts with patients through the Patient Access Network.

Alexey Salamakha, Manager of Rare Disorders for Novartis/Public Affairs and Communications,  read some thoughts on the need for disability benefits from Donna of John’s Foundation for Cushing’s Awareness.  This included the the fact that veterinarians are more knowledgeable about Cushing’s than endocrinologists. He talked about patient advocacy.

Alexey specifically mentioned me and thanked me for my work.

Bob Knutzen was not diagnosed until the age of 52.  He is currently 75.  He expressed his desire to have Centers of Excellence for Hormonal Health with the funds coming from NIH’s budget.

Pituitary disease isn’t rare, just the diagnosis. He also pointed out that pituitary patients generally die 10 years early.  Without treatment, pituitary patients can’t have children.

If I didn’t know what acromegaly was before this meeting, I wouldn’t have known when I left, either.

Sean O’Neil, Vice President at Novartis made comments about his company and what was being done to help patients.

Other topics during this Caucus were:

  • The issues of Cortisol withdrawal
  • Congressmen Snyder and Runyon proposed H con resolution 31 “Supporting Rare Pituitary Disease Awareness”.  Track this resolution through the Committee, House and Senate
  • The need for awareness of pituitary gland diseases
  • There are lifetime changes – people may be cured/in remission but they’re never the same
  • The possibility of a dipstick for cortisol similar to ones diabetics use
  • Faster diagnosis

My contribution to all this was speed of diagnosis.  I told a bit of my story, diagnosing myself in the pre-Internet 1980’s and how today, 26 years later, people are still having issues with diagnosis and wasting on average 6-20 years just getting to surgery.  I mentioned that I knew a few people who went for 20 years before getting diagnosed.

After the Caucus was over, there was a lot of discussion, and I talked with several people who had questions about my experiences, Cushing’s Help, what could be done to raise awareness…

Will anything come of it?  I don’t know but maybe some folks will start thinking a bit more.

From Tom, on Facebook:

Mary did a great job presenting the Cushings story at the April 16 hearing of the Congressional Caucus on Rare Diseases – Challenges our Country Must Address. Co- chairs Congressman Joe Crowley (D-NY) and Congressman Leonard Lance (R-NJ) both attended and endorsed the good work being done in this effort. Mary spoke with many of the sponsors and others both before and after the hearing discussing her personal experience. Mary has created multiple websites to get the message out on rare diseases especially Cushing’s Syndrome. That effort now extends to more than 40 countries and more than 10,000 participants. We will be doing follow ups with the Congressional Caucus on Rare Diseases and with Novartis, RDLA, EveryLife, Patient Access Network, the Pituitary Network Association and others to build on the gains.

And another email:

Dear Mary,

It was a pleasure to meet you and Tom today. Thank you for attending the Rare Disease Congressional Briefing. I think you did an excellent job by sharing your unique perspective on what a life with Cushing’s disease is like. I want to thank you for supporting our mission and educating general public about pituitary disorders. We at Novartis strongly believe that patient advocacy organizations such as Cushing’s Help and Support and passionate advocates like you are the future and the hope of the Cushing’s community.

As a follow up to our conversation I have reached out to my contacts at NORD and asked if they can help with filing for a 501(c)(3) status. I will keep you posted. Please stay in touch.

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