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Table 1 Characteristics of samples from nasopharyngeal carcinoma (NPC) cases and healthy controls from the four case–control datasets
| Dataset | Region | Period | NPC cases | Healthy controls | Note | ||
|---|---|---|---|---|---|---|---|
| Detected/total (no.) | Source | Detected/total (no.) | Source | ||||
| Data_GD1 | Guangdong | Oct 2005–Oct 2007 | 157/346 | Sun Yat-sen University Cancer Center (SYSUCC) | 319/448 | The First Affiliated Hospital of Sun Yat-sen University (1st AH-SYSU) | NPC endemic |
| Data_GD2 | Guangdong | Oct 2008–Jun 2013 | 168/222 | SYSUCC | 241/315 | 1st AH-SYSU | NPC endemic |
| Data_GD3 | Guangdong | Oct 2008–Jun 2013 | 726/1065 | Local hospitals in Guangdong province | 880/1161 | Local hospitals in Guangdong province | NPC endemic |
| Data_SD | Shandong | Oct 2008–Jun 2013 | 58/102 | The Affiliated Hospital of Qingdao University, the Shandong Province Cancer Center | 612/1543 | Local hospitals in Shandong province | NPC non-endemic |
