As reported by Dr. Joseph Mercola (1/11 mercola.com) New Evidence Identifies Strong Cell Phone Cancer Link - A recent study could change the debate over cell phones and cancer. A research
group has reported a sharp increase in the incidence of parotid gland tumors
over the last 30 years, with the steepest increase happening after 2001.
The research was carried out at Hebrew University in Jerusalem at the Hadassah
School of Dental Medicine by Rakefet Czerninski, Avi Zini and Harold
Sgan-Cohen. For many years now, skeptics have argued that the epidemiological
studies pointing to a tumor risk from cell phones must be wrong, because no one
has seen an increase in cell-phone related tumors in the general population.
But one of these earlier epidemiological studies found that heavy users of cell
phones "showed significantly elevated risks" of parotid gland tumors. (Sadetzki
et al showed 49 percent increased risk of parotid gland tumors. Another, by
Lonn et al, in 2006, found parotid gland increase of 160 percent (borderline
significance). So the long- term trend data recently reported by Hebrew
University is not surprising.
According to Microwave News: "The parotid gland is a type of salivary gland --
the one that is closest to the cheek next to where most people hold their cell
phones. Interestingly, the new ... data show no similar increases in the two
other major types of salivary glands, the submandibular and sublingual glands
that are further away from the phone."
In related news, another study by Hardell et al in Sweden has confirmed that
design flaws in the Interphone study (published May 2010) caused the risk of
brain tumors (gliomas) to be underestimated.
The Interphone study claimed that use of a digital cell phone for more than 10
years led to a 118 percent increase in the risk of brain cancer. But an
analysis by Hardell et al in 2006, which experts consider a very well designed
study, revealed that the increased risk of malignant brain tumors could be as
high as 180 percent.
A recent re-analysis of the Hardell data by the Hardell team, published December
17, 2010 in the International Journal of Epidemiology, finally now explains the
difference in brain tumor risk found in the two studies. It shows the
difference to be related to differences in methodology: 1) a difference in the
age ranges selected for the two analyses, and 2) due to the Interphone study
inaccurate classification of portable phone users as 'unexposed' to microwave
When the Hardell data was recast by the Hardell team using the more limited
protocol used by the Interphone study -- i.e. considering subjects who were
between 30-59 years instead of 20-80 years used by the Hardell team originally,
and classifying any subject who used a cordless phone as 'unexposed,' as the
Interphone study had inexplicably done -- the two data sets revealed
essentially the same risk of brain tumors. This demonstrates the lesser risk of
brain cancers from cell phone use reported in the Interphone study was a result
of the Interphone study's design flaws.
Camilla Rees of ElectromagneticHealth.org says: "Were a wider age range used, as
in the original Hardell research (ages 20 to 80), and subjects properly
classify as 'exposed' to microwave radiation if they used portable (including
cordless) phones emitting microwave radiation, the risk of brain tumors would
be as was found in the original Hardell research: a 180% increased risk of
malignant brain cancers."
Dr. Joseph Mercola's Comments: Salivary gland cancers are typically rare and have few known risk factors, but a
new study found a certain type of salivary gland cancer, parotid gland tumors,
are on the rise. In Israel, parotid gland cancers increased 4-fold from 1970 to
2006, while rates of other salivary gland cancers remained stable. Another
interesting finding is that 20 percent of the incidence of salivary gland
tumors are found in people under age 20. What's especially concerning about
these findings? Your parotid gland is the salivary gland closest to where you
hold your cell phone to your ear and cheek.
Just like smoking tobacco, they fail to realize that it can take anywhere from
10 to 30 years for brain tumors to develop from cell phone exposure, so we are
just now beginning to see some of the tragic effects of heavy cell phone use.
The truth is, many believe we are on the verge of a brain cancer epidemic.