Risk of head and neck cancer in patients with diabetes mellitus: a retrospective cohort study in Taiwan.

Importance: An increasing body of evidence suggests that certain types of cancers are more common in people with diabetes mellitus (DM). However, the risk of head and neck cancer (HNC) in patients with DM has seldom been explored.

Objective: To examine the risk of HNC in patients with DM.

Hypercholesterolemia is correlated with an increased risk of idiopathic sudden sensorineural hearing loss: a historical prospective cohort study.

Objective: Despite the many studies on the associated risk of cardiovascular and cerebrovascular events in patients with hypercholesterolemia (HCh), an association between HCh and the development of idiopathic sudden sensorineural hearing loss (ISSNHL) has been examined in only a few case-control studies. We tested the hypothesis that HCh is a risk factor for developing ISSNHL.

Design: Using the Taiwan Longitudinal Health Insurance Database, we conducted a historical prospective cohort study to compare patients diagnosed with HCh from January 1, 2001, through to December 31, 2006 (N = 73,957) with age-matched controls (N = 73,957).