Table 7.
Percentage of primary breast tumor location in UOQ (upper-outer quadrant) as reported in other studies and in this study
| Author, year | Location of the study | Total Number of patients included | Database analyzed | Years | UOQ tumor location (%) |
| Hazrah P (5) | India | 187 | Department Of Surgery All India Institute of Medical Sciences | 1994-2005 | 62 |
| Rummel S (6) | USA | 980 | Clinical Breast Care Project | 2001-2013 | 51.5 |
| Wu S (7) | China | 1044 | Sun Yat-Sen Cancer Center | 1999-2007 | 50.2 |
| Sarp S (8) | Switzerland | 1522 | Geneva Cancer Registry | 1984 - 2002 | 39 |
| Nunes RD (9) | Brazil | 2582 | Population-Based Cancer Registry of Goiânia (RCBPGO) | 1989-2003 | 53.7 |
| Siotos C (10) | USA | 5295 | Johns Hopkins Sidney Kimmel Comprehensive Cancer Center | 2003-2015 | 36.2 |
| Sohn VY (11) | USA | 26,121 | The Department of Defense tumor registry encompasses all military facilities from the United States Army, Air Force, and Navy | 1990-2005 | 57 |
| Eisemann N (12) | Germany | Not specified | Epidemiological cancer register of Schleswig-Holstein | 1999-2009 | 36.1 |
| Sisti A (this study) | USA | 2423875 | National Cancer Database (NCDB) | 2004-15 | 39.50 |