Tillmann T et al. · 2007
Researchers exposed 1,170 mice to cell phone radiation from GSM and DCS wireless signals for 2 hours daily over 2 years to test whether this exposure causes cancer. The study found no increase in cancer rates at any of the three radiation levels tested, including the highest level of 4.0 W/kg. Interestingly, male mice actually showed fewer liver tumors at higher radiation doses, though overall tumor rates remained within normal ranges for laboratory mice.
Takebayashi T et al. · 2006
Japanese researchers studied 101 people with acoustic neuromas (benign tumors on the nerve connecting the ear to the brain) and compared their mobile phone use to 339 healthy controls. They found no increased risk of developing these tumors among mobile phone users, even those who used phones for over 8 years or accumulated more than 900 hours of call time. The study suggests mobile phone use does not significantly increase acoustic neuroma risk in Japan.
Wang LL, Chen GD, Lu DQ, Chiang H, Xu ZP. · 2006
Researchers exposed breast cancer cells (MCF-7) to cell phone radiation at 1800 MHz for 24 hours to see if it would change gene activity. They found essentially no meaningful changes in gene expression, even when using exposure levels higher than typical cell phone use. The study suggests that this type of radiation may not significantly alter how genes function in these particular cells.
Shen YH, Yu D, Fu YT, Chiang H. · 2006
Chinese researchers exposed 500 female rats to cell phone radiation (900 MHz GSM signals) for 4 hours daily over 26 weeks after giving them a chemical known to cause breast tumors. They tested different radiation levels, including some well above typical phone exposure. The study found no difference in breast cancer rates between exposed and unexposed rats - about one-third developed tumors regardless of radiation exposure.
Schüz J et al. · 2006
Danish researchers followed 420,095 cell phone subscribers for up to 21 years to see if mobile phone use increased cancer risk. They found no increased risk for brain tumors, acoustic neuromas, or other cancers typically associated with phone use, even among people who used phones for 10 years or more. This large-scale study suggests that cell phone use does not significantly increase cancer risk over the long term.
Schuz J et al. · 2006
German researchers studied 747 brain tumor patients and 1,494 healthy controls to see if sleeping near DECT cordless phone base stations increases brain tumor risk. They found no increased risk of glioma or meningioma brain tumors, with odds ratios of 0.82 and 0.83 respectively (values below 1.0 suggest slightly reduced risk). This provides initial evidence that low-level radiofrequency exposure from cordless phone base stations may not increase brain tumor risk.
Schuz J et al. · 2006
German researchers studied 747 brain tumor patients and 1,494 healthy controls to examine whether cell phone and cordless phone use increases the risk of glioma and meningioma (two types of brain tumors). While they found no overall increased risk from phone use, people who used cell phones for 10 or more years showed a 2.2-fold higher risk of glioma, though this finding wasn't statistically definitive. The results suggest potential long-term risks that require further investigation.
Qutob SS et al. · 2006
Researchers exposed human brain cancer cells (glioblastoma) to 1.9 GHz radiofrequency radiation for 4 hours at power levels ranging from very low to quite high (0.1 to 10 W/kg SAR). They found no changes in gene expression at any exposure level, while heat treatment successfully triggered expected cellular stress responses. This suggests that RF fields at these levels don't alter how genes function in these particular brain cells.
Muscat JE, Hinsvark M, Malkin M · 2006
Researchers analyzed brain cancer rates in the United States from 1973 to 2002, comparing them to the dramatic rise in mobile phone use that began in 1984. Despite mobile phone subscriptions increasing exponentially during this period, rates of neuronal brain cancers remained unchanged. This suggests that mobile phone use does not increase the risk of these specific types of brain tumors.
Lonn S et al. · 2006
Researchers in Denmark and Sweden studied whether long-term mobile phone use increases the risk of parotid gland tumors (tumors in the salivary glands near your ears). They compared 172 people with these tumors to 681 healthy controls, examining their mobile phone usage patterns over more than 10 years. The study found no increased risk of either malignant or benign parotid gland tumors associated with mobile phone use, even among long-term users.
Lahkola A, Tokola K, Auvinen A. · 2006
Researchers analyzed 12 studies involving 2,780 people with brain tumors to determine if mobile phone use increases cancer risk. They found no significant increase in brain tumor risk for people who used mobile phones for more than 5 years, with odds ratios (risk measures) hovering around 1.0 for all tumor types studied. This suggests that at least for the first 5-10 years of mobile phone use, the risk of developing brain tumors does not appear to increase substantially.
Hepworth SJ et al. · 2006
Researchers studied 966 glioma patients and 1,716 healthy controls to see if mobile phone use increases brain tumor risk. They found no overall increased risk of glioma from phone use, with an odds ratio of 0.94 (meaning slightly lower risk, though not statistically significant). However, they noted some curious findings about tumor location that they attributed to recall bias rather than real biological effects.
Heikkinen et al. · 2006
Finnish researchers exposed female rats to 900 MHz radiofrequency radiation (similar to cell phone frequencies) for 2 hours daily over 2 years while also giving them a known cancer-causing chemical in their drinking water. The study aimed to see if RF radiation would make tumors more likely to develop. The researchers found no evidence that RF radiation increased cancer risk, even when combined with a chemical known to cause tumors.
Zook BC,Simmens SJ. · 2006
Researchers exposed 1,080 rats to pulsed 860 MHz radiofrequency radiation (similar to cell phone signals) for 6 hours daily to see if it would accelerate tumor development in animals already given a cancer-causing chemical. After examining over 1,200 brain and nervous system tumors, they found no evidence that RF exposure affected tumor incidence, growth rate, severity, or how quickly tumors appeared. This suggests that this particular RF signal did not act as a tumor promoter in this animal model.
Vrijheid M, Deltour I, Krewski D, Sanchez M, Cardis E. · 2006
Researchers used computer simulations to examine how memory errors and study design flaws might affect cancer research on cell phone use. They found that when people can't accurately remember their past phone usage, studies may significantly underestimate the true cancer risk from mobile phones. This suggests that existing studies showing little or no cancer risk may be missing real health effects due to these research limitations.
Vrijheid M et al. · 2006
Researchers tracked actual mobile phone use in 672 volunteers across 11 countries using operator records and software-modified phones, then compared this to what people remembered six months later. The study found that people's memories were moderately accurate but contained significant errors - light users underestimated their phone use while heavy users overestimated it. This memory bias weakens the ability of cancer studies to detect real health risks from mobile phone radiation.
Salahaldin AH, Bener A. · 2006
Researchers in Qatar examined all 13 cases of acoustic neuroma (a type of brain tumor) diagnosed over two years and found that most patients were heavy cell phone users, making calls 14 times daily for over 5 years. The country's acoustic neuroma rate of 17.2 cases per million people was higher than rates reported in other countries. This suggests a potential link between intensive cell phone use and this specific type of brain tumor.
Linet MS et al. · 2006
Researchers studied whether cellular phone use increases the risk of non-Hodgkin lymphoma (a type of blood cancer) by comparing 551 cancer patients to 462 healthy controls. They found no increased cancer risk even among regular phone users, though very few participants had used phones for more than 6 years or 200 total hours. The findings are limited because cell phone use was still relatively new when the study was conducted in the early 2000s.
Kim SC, Nam KC, Kim DW. · 2006
Researchers developed a computer model to estimate how much radiofrequency radiation different cell phone users receive based on their usage patterns. The model considers factors like daily usage time, hands-free use, phone type, and the phone's specific absorption rate (SAR) to rank exposure risk on a 0-10 scale. This tool could help scientists better categorize study participants in future research investigating links between cell phone radiation and brain cancer.
Hardell L, Carlberg M, Hansson Mild K. · 2006
Researchers analyzed phone use data from 905 brain cancer patients and 2,162 healthy controls to examine whether cellular and cordless phones increase brain tumor risk. They found that heavy phone users (more than 2,000 hours of lifetime use) had significantly higher rates of malignant brain tumors, with analog phones showing the highest risk at nearly 6 times normal rates. The risk was greatest when tumors developed on the same side of the head where people typically held their phone.
Hardell L, Carlberg M, Hansson Mild K. · 2006
Swedish researchers analyzed data from over 3,400 people to examine whether cell phone and cordless phone use increases the risk of benign brain tumors. They found that analog cell phone users had nearly triple the risk of developing acoustic neuroma (a tumor affecting hearing), while digital phones and cordless phones showed more modest increases in risk. The risk was highest among people who had used analog phones for more than 15 years.
Hardell, L., Carlberg, M., Mild, K., 2005. · 2006
Swedish researchers studied 317 people with malignant brain tumors and compared their phone usage to 692 healthy controls. They found that people who used analog cell phones, digital cell phones, or cordless phones had roughly 2-3 times higher odds of developing brain tumors, with the risk increasing to 3-4 times higher for those who used phones for more than 10 years. The risk was strongest for high-grade astrocytoma, an aggressive type of brain cancer.
Berg G et al. · 2006
German researchers studied nearly 1,500 workers exposed to radio frequency radiation in their jobs to see if they developed brain tumors more often than unexposed people. While they found no statistically significant increase in brain cancer risk, workers with the highest occupational RF exposure showed a 21% higher risk of glioma and 34% higher risk of meningioma compared to unexposed workers. The researchers noted that longer exposure duration showed a concerning trend toward increased risk that warrants further investigation.
Anghileri LJ, Mayayo E, Domingo JL, Thouvenot P. · 2006
Researchers exposed mice to radio frequency radiation from cellular phones and found it accelerated cancer development in ways similar to known cancer-promoting chemicals. The study showed that RF exposure triggered calcium ion signals that activated cancer-causing genes while weakening immune defenses. This suggests cell phone radiation may speed up cancer progression through the same biological pathways used by established carcinogens.
Anghileri LJ, Mayayo E, Domingo JL. · 2006
Researchers investigated whether iron supplements might worsen cancer risk from radiofrequency radiation exposure using animals that naturally develop lymphomas (blood cancers) as they age. They found that combining radiofrequency exposure with iron injections created a synergistic effect, meaning the combination was more dangerous than either factor alone. This suggests that people receiving iron therapy might face increased cancer risk from RF radiation exposure.
