2.
Distribution of CTLA-4+49A > G polymorphisms genotype and allele among lung cancer patients and controls
| Study | Year | Cases (n) | Controls (n) | |||||||||
| GG | AG | AA | G | A | GG | AG | AA | G | A | |||
| Sun | 2008 | 509 | 519 | 135 | 1, 537 | 789 | 563 | 488 | 81 | 1, 614 | 650 | |
| Sun | 2008 | 468 | 439 | 125 | 1, 375 | 689 | 493 | 438 | 90 | 1, 424 | 618 | |
| Khaghanzadeh | 2010 | 13 | 44 | 66 | 70 | 176 | 7 | 47 | 68 | 67 | 183 | |
| Karabon | 2011 | 34 | 106 | 68 | 174 | 242 | 72 | 145 | 107 | 289 | 359 | |
| Antczak | 2013 | 27 | 25 | 19 | 79 | 63 | 22 | 33 | 49 | 77 | 131 | |
| Liu | 2015 | 77 | 101 | 53 | 255 | 207 | 51 | 91 | 108 | 193 | 307 | |
| Ma | 2015 | 74 | 282 | 172 | 430 | 626 | 72 | 306 | 222 | 450 | 750 | |
| Chen | 2017 | 268 | 231 | 50 | 767 | 331 | 279 | 264 | 68 | 822 | 400 | |
| Chen | 2017 | 254 | 219 | 47 | 727 | 313 | 504 | 431 | 93 | 1439 | 617 | |