2005 Abstracts: High Rates of Gallbladder Cancer in New Zealand Maori: An Interplay of Disease and Social Factors
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High Rates of Gallbladder Cancer in New Zealand Maori: An Interplay of Disease and Social Factors
Jonathan Koea, Auckland Hospital, Auckland, Auckland, New Zealand; Andrew Sporle, University of Auckland, Auckland, Auckland, New Zealand
Introduction. Carcinoma of the gallbladder (GBC) is a rare cancer which has a defined geographical distribution with the highest incidence observed in South America and Asia. The indigenous population of New Zealand (NZMaori) also has an elevated rate of GBC for reasons that are unclear.
Methods. Diagnostic and procedural data for NZ Maori, Pacific Islanders and European New Zealanders was obtained from the National Cancer Registry of New Zealand for 1988 – 2001 inclusive. Data were stratified for ethnicity, admission rate with gallstone related disease (biliary colic, cholecystitis, choledocolithiasis, cholangitis and pancreatitis), admissions with sepsis (cholecystitis, cholangitis and pancreatitis), and procedure (laparoscopic or open cholecystectomy. National census statistics were used to calculate age standardized incidence rates. Results. Between 1988 and 2001 the age standardized rates for GBC in Europeans was 0.36/100,000 in men and 0.70/100,000 in women; and 0.32/100,000 in Pacific Island men, 0.76/100,000 in Pacific Island women. In the same period the age standardized rates for GBC in NZMaori were 1.49/100,000 in men and 1.59/100,000 in women with NZMaori having 3.5 times the relative risk of non-Maori in developing GBC (95% Confidence Interval; 2.1-5.0).| Admission Rate | % Admissions with Sepsis | Cholecystectomy Rate | |
| NZMaori | 27/100,000 | 62% | 5/100,000 |
| Pacific | 33/100,000 | 68% | 23/100,000 |
| European | 22/100,000 | 37% | 31/100,000 |
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