Navigation Links
Increase in Thyroid Cancer Puzzles Experts
Date:7/14/2009

Uptick since 1980 cannot be explained solely by better screening: study

TUESDAY, July 14 (HealthDay News) -- Intensified screening doesn't entirely explain the jump in thyroid cancers noted in the United States since 1980, and scientists now believe that other as-yet-unknown factors are to blame.

A new study finds that thyroid tumors of all sizes are being picked up, not just the smaller ones that more aggressive screening would be expected to detect.

"You cannot simply explain this by increased screening, there's a real increased incidence," said Dr. Amy Chen, lead author of a study published online July 13 in the journal Cancer.

Although, "some of this increased incidence is due to increased screening finding smaller tumors," she added.

The findings surprised one expert.

"I wrote a chapter about this for a textbook about a year ago and I came away thinking this [rise in cancers] is a reflection of enhanced diagnostics," said Dr. Bruce J. Davidson, professor and chairman of otolaryngology-head and neck surgery at Georgetown University Hospital in Washington, D.C. But, "it is more disturbing that it's not just small tumors; it seems to be all tumors," he said.

An estimated 37,200 new cases of thyroid cancer will be diagnosed this year, according to the U.S. National Cancer Institute. Fortunately, the cancer is considered highly curable, but the researchers said survival rates have not improved with better detection.

Until now, an uptick in cases seen over the past three decades was attributed to increased use of ultrasound and image-guided biopsy to detect tumors. Some researchers had found that thyroid cancer was diagnosed more often in areas with higher incomes and less in uninsured populations, adding further credence to this theory.

Looking at thyroid cancer cases from 1988 to 2005 reported in a large cancer database, Chen and her team found a higher incidence not just in small tumors, but across all sizes.

The most pronounced increase was seen in primary tumors under 1.0 centimeters -- small ones for which many experts consider it safe to take a wait-and-see approach. The rate for these tumors rose almost 10 percent per year in men (1997 to 2005) and 8.6 percent per year in women (1988 to 2005).

But the authors also saw a 3.7 percent annual increase in tumors exceeding 4 centimeters in men and a 5.7 percent yearly rise in these tumors in women.

Cancers that had spread also increased in men by 3.7 percent annually and in women by 2.3 percent.

Thyroid cancer can be caused by exposure to radiation but there has been no evidence of increased exposure to radiation among Americans.

"People have looked at background radiation and nothing really has come of that that's very useful. And certainly not useful to us in why there would be a bump in incidence in the last 15 years," Davidson said.

Chen proposed in the study that environmental, dietary and genetic issues be explored.

More information

There's more on thyroid cancer at the American Cancer Society.



SOURCES: Bruce J. Davidson, M.D., professor and chairman, otolaryngology-head and neck surgery, at Georgetown University Hospital, Washington, D.C.; Amy Chen, M.D., director of health services research, American Cancer Society and associate professor of otolaryngology-head and neck surgery, Emory University, Atlanta; online, July 13, 2009 Cancer


'/>"/>
Copyright©2009 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Smoking may strongly increase long-term risk of eye disease
2. Diabetes appears to increase risk of death for patients with acute coronary syndromes
3. Prophylactic cranial irradiation in small cell lung cancer significantly increases survival
4. Fat on chest and upper back increases risk of insulin resistance
5. Ability to cope with stress can increase good cholesterol in older white men, study finds
6. Handling Stress Properly Increases Good Cholesterol
7. High alcohol consumption increases stroke risk among Chinese men
8. High alcohol consumption increases stroke risk, Tulane study says
9. Increased distance to physician associated with thicker skin cancer at diagnosis
10. Genetic predisposition increases childhood asthma risk
11. Smoking increases risks for head and neck cancers for men and women
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Increase in Thyroid Cancer Puzzles Experts
(Date:5/4/2016)... ... May 04, 2016 , ... All-Star Insurance of Northeast ... the people of their local community. The agency pledges to select a new ... hope is to bring awareness to important local causes with fundraising and other ...
(Date:5/4/2016)... ... May 04, 2016 , ... ... teamed up with one of the top website design companies to create a ... legal articles related to the law firm's main practice areas. These practice areas ...
(Date:5/4/2016)... ... May 04, 2016 , ... Nordic Naturals announces another breakthrough ... health. This synergistic combination of omega-3 fatty acids and potent antioxidants contains 1000 ... reduced glutathione and 200 mg of N-Acetylcysteine (NAC). , Each nutrient plays ...
(Date:5/4/2016)... ... 04, 2016 , ... Natalie Jill is a well respected lifestyle ... of the launch of her new book: Natalie Jill’s 7 Day Jump Start: Unprocess ... to jump start a new healthy lifestyle featuring simple recipes using MitoXcell’s raw cacao ...
(Date:5/4/2016)... ... May 04, 2016 , ... Bayco Products has ... (6.7 inch) dual-light flashlights in models NSP-9842XL and NSR-9844XL . , First ... at $59.95) uses 2 included CR-123 batteries to produce up to 650 lumens ...
Breaking Medicine News(10 mins):
(Date:5/4/2016)... , May 4, 2016 ... addition of the  "Global Actinic Keratosis Market ... to their offering.       (Logo: ... Keratosis Market and Competitive Landscape Highlights 2016, ... products, Actinic Keratosis epidemiology, Actinic Keratosis market ...
(Date:5/3/2016)... a major investment from Sino-German High-Tech Fund to further expand product development, strengthen its disease modeling capabilities and increase ... ... ... ... ...
(Date:5/3/2016)... LAKE OSWEGO, Ore. , May 3, 2016 /PRNewswire/ ... about the importance of extending care beyond the implant ... Scientific Sessions, May 4-7 in San Francisco ... tasked with continually delivering the highest quality of patient ... ensuring patients are cared for each and every tomorrow," ...
Breaking Medicine Technology: