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Introduction: Obesity-related cancer (ORC) diagnosed individuals are at an elevated risk of new-onset diabetes compared with cancer-free individuals. However, less is known about mortality among those with incident type 2 diabetes after cancer. Methods: In the Women’s Health Initiative (N=14,455 ORC cases), we measured the association of incident type 2 diabetes diagnosed 0-1 years, >1-3, >3-5, >5-7 and >7-10 years after ORC diagnosis with cancer-specific and overall mortality using stratified Cox proportional hazards regression analysis. Results: The participants were post-menopausal females with ORC and predominantly white. The number of WHI participants with ORC who developed diabetes after cancer diagnosis were: 0-1 years - 205/12992 (1.58%); 1-3 years - 326/11322 (2.88%); 3-5 years - 276/9784 (2.82%); 5-7 years - 268/8420 (3.18%); and 7-10 years - 510/6419 (7.95%). The median survival after the first year of cancer diagnosis for participants without diabetes was 16.6 years (95% CI: 16.17-17.0 years) and for those with diabetes was 10.3 years (95% CI: 7.97-14.9 years). New-onset diabetes after ORC diagnosis showed elevated overall mortality and cancer-specific mortality when compared with no diabetes diagnosis. Conclusions: Incident type 2 diabetes is associated with worse cancer-specific and overall survival, particularly in the year after diagnosis, among women with ORC. Type 2 Diabetes from time since cancer diagnosis Overall mortality HR (95% CI)a Cancer-specific mortality HR (95% CI)a 0-1 years 1.79 (1.41-2.29) 1.56 (1.04-2.34) >1-3 years 1.22 (0.99-1.51) 1.05 (0.72-1.55) >3-5 years 1.21 (0.95-1.55) 1.37 (0.89-2.12) >5-7 years 1.02 (0.78-1.33) 0.80 (0.47-1.36) >7-10 years 1.10 (0.87-1.40) 0.97 (0.59-1.60) aModel adjusted for demographics (age, education, race/ethnicity, marital status), body mass index (BMI)) and cancer characteristics (cancer type, stage, grade). CI = confidence interval; HR = Hazard ratio. Citation Format: Prasoona Karra, Maci Winn, Benjamin Haaland, Garnet Anderson, Cynthia A. Thomson, Aladdin H. Shadyab, Juhua Luo, Nazmus Saquib, Howard Strickler, Rowan Chlebowski, Rhonda Arthur, Sheetal Hardikar, Mary C. Playdon. Diabetes incidence after obesity-related cancer diagnosis and survival in the women’s health initiative [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 5880. |
