ASSOCIATION BETWEEN EARLY CATARACT AND CANCER

According to this study in Cancer Science:

Early-onset cataract has been associated with insufficient antioxidative activity, with a potential risk of cancer. This study was to investigate the risk of cancer after being diagnosed with early-onset cataract. 
The overall incidence rate of all cancers was 2.19-fold higher in the early-onset cataract cohort than in the comparison cohort (8.06 vs 3.68 per 1000 person-years) with an adjusted HR of 2.13 (95% CI = 1.48, 3.07). The site specific analysis also showed strong relationship with adjusted HRs of 3.24 ((95% CI = 1.30, 8.10) for head and neck cancer, 3.29 (95% CI 1.16, 9.31) for hepatoma, and 3.19 (95% CI 1.34, 7.58) for breast cancer. 
This study suggests that patients with early-onset cataract are at an increased risk of being diagnosed with cancer in subsequent years.