Nonfatal cancer preceding Parkinson's disease: a case-control study.
BACKGROUND
We conducted a population-based case-control study to investigate the association of Parkinson's disease (PD) with preceding nonfatal cancer.


METHODS
We used the medical records-linkage system of the Rochester Epidemiology Project to identify all incident cases of PD in Olmsted County, MN (1976-1995). Each case was matched by age and sex to a general population control. We ascertained cancer diagnoses through medical records abstraction.


RESULTS
The frequency of any cancer was lower in cases (19.4%) than in controls (23.5%) (OR = 0.79; 95% CI = 0.49-1.27). This pattern was more pronounced in women than in men, and in patients age 71 years or younger at onset of PD than in older patients. We found an interaction between smoking and smoking-related cancers in their association with PD. Bladder cancer (OR = 0.22; 95% CI = 0.03-2.24) and breast cancer (OR = 0.20; 95% CI = 0.02-1.71) were less frequent in PD cases than in controls, whereas prostate cancer was more frequent in PD cases than in controls (OR = 1.80; 95% CI = 0.60-5.37). However, these results are based on small numbers.


CONCLUSIONS
We did not find a strong association between PD and preceding nonfatal cancer. There were suggestive trends in analyses stratified by sex and age at onset of PD, and for specific cancers related to smoking or hormonal factors.
Elbaz
Alexis
A
Department of Health Sciences Research, Mayo Clinic and Mayo Foundation, Rochester, MN 55905, USA
Peterson
Brett J
BJ
Yang
Ping
P
Van Gerpen
Jay A
JA
Bower
James H
JH
Maraganore
Demetrius M
DM
McDonnell
Shannon K
SK
Ahlskog
J Eric
JE
Rocca
Walter A
WA
D000230:Adenocarcinoma / Q000453:epidemiology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology; D016022:Case-Control Studies; D015897:Comorbidity; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000453:epidemiology*; D010300:Parkinson Disease / Q000453:epidemiology*