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:5/26/2016)... ... May 26, 2016 , ... Saint Francis Hospital ... years, and the efforts have paid off. Since implementation of these efforts, ... care to enhance perioperative patient experiences and reduce costly complications. Since implementation in ...
(Date:5/26/2016)... ... May 26, 2016 , ... Development Team of Pixel ... for FCPX. , "This new layered style transition tool will keep a consistent flow ... CEO of Pixel Film Studios. , TranSweep is an all new layered style ...
(Date:5/26/2016)... (PRWEB) , ... May 26, 2016 , ... ... industry leader in Blood Pressure products . , High blood pressure affects ... effects. Left untreated, high blood pressure can lead to heart disease, stroke, kidney ...
(Date:5/25/2016)... ... May 26, 2016 , ... The United States Food and Drug Administration ... both men and women. To date, the company is the first and only manufacturer ... adult who suffers with androgenetic alopecia. , “This new level of clearance substantiates ...
(Date:5/25/2016)... ... 25, 2016 , ... The Georgia State University College of Law new building ... Design Commission. , The annual award recognizes projects, programs, individuals and organizations that have ... of its physical heritage and the balance between the old and the new. , ...
Breaking Medicine News(10 mins):
(Date:5/24/2016)... LONDON , May 24, 2016 ... erfüllt beide primären Endpunkte ... und Überlegenheit in ‚ausgezeichneter plus guter ... aufsteigenden Colons    ,      (Logo: ... B.V. gab heute neue positive Daten von der ...
(Date:5/24/2016)... -- NxStage Medical, Inc. (Nasdaq: NXTM ), a ... today announced that Jeffrey H. Burbank , Chief ... of investor conferences. Where applicable, a webcast of the ...   ... Friday, June 10, 2016 1:30 p.m. ET ...
(Date:5/24/2016)... HONG KONG , May 24, 2016 /PRNewswire/ ... primer stent de doble terapia del mundo, introduce ... fístula arteriovenosa. OrbusNeich, una compañía global ... cambian las vidas, ha expandido su cartera incluyendo ... catéteres balón JADE™ y Scoreflex™ PTA son los ...
Breaking Medicine Technology: