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Association between Low-Dose Aspirin Use and Colorectal Cancer Incidence Using Japanese Large-Scale Health Insurance

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Area of Science:

  • Oncology
  • Gastroenterology
  • Preventive Medicine

Background:

  • Experimental data suggests low-dose aspirin (ASA) has chemopreventive properties against colorectal cancer (CRC).
  • Clinical evidence for ASA's CRC chemoprevention is inconsistent.
  • Limited data exists on ASA's CRC chemopreventive effects in Asian populations.

Purpose of the Study:

  • To investigate the association between low-dose aspirin use and colorectal cancer risk.
  • To evaluate the impact of aspirin use recency and duration on CRC risk.
  • To provide evidence for CRC prevention strategies in Asian populations.

Main Methods:

  • A large-scale nested case-control study utilizing a Japanese health insurance claims database (2005-2021).
  • 17,373 colorectal cancer cases were matched 1:4 with 69,492 controls based on age and sex.
  • Exposure defined as low-dose aspirin use prior to diagnosis, with analysis of recency and duration.

Main Results:

  • Low-dose aspirin use was associated with a reduced risk of colorectal cancer (adjusted odds ratio: 0.87; 95% CI: 0.79-0.97).
  • Recent aspirin use (< 3 months before diagnosis) significantly lowered CRC risk.
  • Longer duration of aspirin use (≥ 2 years) was associated with a significant reduction in CRC risk compared to never use.

Conclusions:

  • Low-dose aspirin use is potentially associated with a reduced risk of colorectal cancer.
  • Findings support the chemopreventive role of aspirin in colorectal cancer, particularly in Asian populations.
  • Further research into optimal aspirin dosage, duration, and patient selection for CRC prevention is warranted.