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Published on: June 15, 2011
Causal associations between schizophrenia and cancers risk: a Mendelian randomization study
Kai Zhou1, Lin Zhu1, Nian Chen2
1Department of Head and Neck Oncology, The Second Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China.
This study found a causal link between schizophrenia and increased risks for several cancers, including lung, thyroid, colorectal, ovarian, and breast cancer. However, it also suggested a reduced risk for stomach cancer in individuals with schizophrenia.
Area of Science:
- Psychiatry and Oncology
- Genetic Epidemiology
- Mendelian Randomization Studies
Background:
- Observational studies show inconsistent cancer incidence in schizophrenia patients.
- The causal link between schizophrenia and cancer requires further investigation.
Purpose of the Study:
- To investigate the causal relationship between schizophrenia and cancer using a robust genetic approach.
Main Methods:
- A two-sample Mendelian randomization (MR) analysis was performed.
- Utilized publicly available genome-wide association studies data.
- Employed the random-effects inverse-variance-weighted method for effect estimation.
Main Results:
- A positive causal relationship was identified between schizophrenia and lung, thyroid, colorectal, ovarian, and breast cancers.
- Schizophrenia showed an increased risk for these cancers.
- An inverse causal relationship was observed for malignant neoplasm of the stomach, indicating a reduced risk.
Conclusions:
- Schizophrenia is causally linked to an increased risk of developing lung, thyroid, colorectal, ovarian, and breast cancers.
- A potential protective effect of schizophrenia against stomach cancer was indicated.
- Mendelian randomization provides strong evidence for these causal associations.
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