Surge in Thyroid Cancer Cases May Be Due to This
Many might be getting unnecessary treatment for slow-growing disease, some experts say
By Steven Reinberg
THURSDAY, Feb. 20, 2014 (HealthDay News) -- A surge in the number of thyroid cancer cases in recent decades suggests the disease is being overdiagnosed and overtreated, a new study contends.
Although the number of thyroid cancer diagnoses has almost tripled since 1975, most are the more common and less aggressive form of the disease known as papillary thyroid cancer, the study authors said.
"The incidence of thyroid cancer is at epidemic proportions, but it doesn't look like an epidemic of disease, it looks like an epidemic of diagnosis," said lead researcher Dr. H. Gilbert Welch, a professor of medicine at the Dartmouth Institute for Health Policy and Clinical Practice.
According to Welch, more people are having their neck imaged to look for blockage of the arteries or for other reasons, and nodules on the thyroid are then found.
"This means that a lot of people are having their thyroids removed for a cancer that was never going to bother them," he said.
Welch believes that thyroid cancer should be treated much like prostate cancer, another slow-growing cancer, where patients have an option for watchful waiting that may never result in aggressive treatment.
"We have to be really cautious that we don't create more problems than we solve. We will be looking hard at the question of watchful waiting for small papillary thyroid cancers, and we are going to be asking hard questions about whether we should even be looking for them," Welch said.
The report was published online Feb. 20 in the journal JAMA Otolaryngology-Head & Neck Surgery.
Dr. David Cooper, a professor of medicine and radiology at Johns Hopkins University School of Medicine, thinks another factor may be at play with thyroid cancer diagnoses and treatment.
"I would submit that this is not the cause of the current thyroid cancer epidemic, since this is how doctors have been examining patients for decades or even centuries," he said.
"Once a thyroid abnormality is found, it is hard to ignore it in the current medical environment, and patients often end up on an unstoppable juggernaut, leading to invasive procedures such as thyroid biopsy and ultimately to surgery," Cooper said.
Welch noted that the treatment of many cancers is changing.
"Medicine is in the midst of a course correction. We've believed for years that the best strategy for cancer was to find as much as we could, but we are realizing that the population harbors a lot of early cancer, and we have to make sure we don't create more problems than we solve by looking for them," he said.
For the study, Welch and his colleague, Dr. Louise Davies of the VA Medical Center in White River Junction, Vt., used federal government data to study patients diagnosed with thyroid cancer from 1975 to 2009.