title: Cancer among spouses: review of 195 couples.
abstract: BACKGROUND
  The study of cancer in spouses may play an important role in the assessment of cancer etiology.
  
  
  METHODS
  Patterns of occurrence of cancer in 195 couples related by marriage only and treated in a regional hospital are reported. The distribution of tumors by site was compared with national data.
  
  
  RESULTS
  Seven sites of cancer were found to be more frequent in married couples than in the general population, in particular carcinoma of the colon (37 observed vs. 19.5 expected in husbands [relative risk (RR) = 1.89 (95% confidence intervals [CI], 1.5-2.4); P < 0.001] and 32 vs. 16.7 in wives [RR = 1.92 (95% CI, 1.4-2.5); P < 0.001]), carcinoma of the prostate (32 vs. 20 in husbands [RR = 1.6 (95% CI, 1.19-2.09); P < 0.01]), and carcinoma of the female breast (84 vs. 55 in wives [RR = 1.53 (95% CI, 1.3-1.8); P < 0.001]). Same site tumors were observed in 13 couples versus 6.21 expected in the general population (RR = 2.09 [95% CI, 1.25-3.26]; P < 0.01). A combination of carcinoma of the prostate and female breast sites was found in 18 couples versus 5.4 expected in the general population (RR = 3.34 [95% CI, 2.19-4.84]; P < 0.001).
  
  
  CONCLUSIONS
  The distribution of cancer sites among spouses in those families in which both spouses have developed a cancer differs from that of the general population. These differences may be caused by shared risk factors. Increased awareness can explain only part of the excess.
authors.affiliation: Department of Oncology, Assaf Harofeh Medical Center, Zrifin, Israel.
authors.forename: N
authors.initials: N
authors.lastname: Walach
authors.forename: I
authors.initials: I
authors.lastname: Novikov
authors.forename: I
authors.initials: I
authors.lastname: Milievskaya
authors.forename: G
authors.initials: G
authors.lastname: Goldzand
authors.forename: B
authors.initials: B
authors.lastname: Modan
mesh_terms: D000367:Age Factors; D000368:Aged; D001932:Brain Neoplasms / Q000453:epidemiology; D001943:Breast Neoplasms / Q000453:epidemiology; D002277:Carcinoma / Q000453:epidemiology; D016009:Chi-Square Distribution; D003110:Colonic Neoplasms / Q000453:epidemiology; D016001:Confidence Intervals; D004777:Environment; D005192:Family Health; D005260:Female; D006801:Humans; D015994:Incidence; D007557:Israel / Q000453:epidemiology; D007585:Jews / Q000706:statistics & numerical data; D008019:Life Style; D008297:Male; D008393:Marriage; D009010:Monte Carlo Method; D009369:Neoplasms / Q000453:epidemiology*; D011336:Probability; D011471:Prostatic Neoplasms / Q000453:epidemiology; D012004:Rectal Neoplasms / Q000453:epidemiology; D012042:Registries; D012307:Risk Factors; D012737:Sex Factors; D018454:Spouses / Q000706:statistics & numerical data*; D013274:Stomach Neoplasms / Q000453:epidemiology