Following 7 case control studies and 11 cohort studies were included: Demers et al. (1991), Loomis (1992), Rosenbaum et al (1994), Stenlund et al. (1997), Cocco et al. (1998), Feychting et al. (1998), Park et al. (2004), Matanoski et al. (1991), Tynes et al. (1992), Guenel et al. (1993), Floderus et al. (1994), Theriault et al. (1994), Savitz et al. (1995), Fear et al. (1996), Johansen et al. (1998), Floderus et al. (1999), Pollan et al. (2001), and Nichols et al. (2005).
356 cases of male breast cancer
A statistical significant increased risk of male breast cancer with electromagnetic field exposure was found (pooled ORs = 1.32, CI = 1.14 -1.52), and subgroup analyses also showed similar results.
The authors concluded that electromagnetic field exposure may be associated with the increased risk of male breast cancer despite missing experimental evidence.