GNRH1 and pachyonychia congenita: The Cox proportional hazard regression showed that the HR of pneumonia for PC patients who received treatment with GnRH agonists during the 1-year follow-up period was 2.23 (95% CI: 1.30∼3.82) compared to PC patients who did not receive treatment with GnRH agonists after censoring cases who died from non-pneumonia causes during the 1-year follow-up period.