All Publications

  • Association of Prediagnosis Obesity and Postdiagnosis Aspirin With Survival From Stage IV Colorectal Cancer. JAMA network open Davis, J. S., Chavez, J. C., Kok, M., San Miguel, Y., Lee, H. Y., Henderson, H., Overman, M. J., Morris, V., Kee, B., Fogelman, D., Advani, S. M., Johnson, B., Parseghian, C., Shen, J. P., Dasari, A., Shaw, K. R., Vilar, E., Raghav, K. P., Shureiqi, I., Wolff, R. A., Meric-Bernstam, F., Maru, D., Menter, D. G., Kopetz, S., Chang, S. 2022; 5 (10): e2236357


    Importance: The potential relationship between obesity and colorectal cancer (CRC) outcome is poorly understood in patients with late-stage disease. Increased body mass index may negate aspirin use for cancer prevention, but its role as a factor on the effectiveness of postdiagnosis aspirin use is unclear.Objective: To evaluate how prediagnosis obesity and postdiagnosis aspirin use may be associated with overall survival in patients with late-stage colorectal cancer.Design, Setting, and Participants: This cross-sectional study used self-reported data from patients with metastatic or treatment-refractory disease who consented to a clinical protocol at MD Anderson Cancer Center, a large US cancer treatment center. Patients were enrolled between 2010 and 2018 and followed up for mortality through July 2020. Analyses were conducted through March 2022.Exposures: Body mass index in the decade prior to initial diagnosis and regular aspirin use at survey completion.Main Outcomes and Measures: Overall survival was measured from stage IV diagnosis until death or last follow-up. Cox proportional hazards models were constructed to estimate associations of prediagnosis obesity and postdiagnosis aspirin use with overall survival.Results: Of 656 patients included in this analysis, 280 (42.7%) were women, 135 (20.6%) were diagnosed with CRC before age 45 years, 414 (63.1%) were diagnosed between ages 45 and 65 years, and 107 (16.3%) were diagnosed at 65 years or older; 105 patients (16.0%) were Black or Hispanic, and 501 (76.4%) were non-Hispanic White. Controlling for age, sex, race, stage at initial diagnosis, and weight change between prediagnosis and survey date, patients with obesity in the decade prior to CRC diagnosis had significantly higher likelihood of death (hazard ratio, 1.45; 95% CI, 1.11-1.91) compared with those with normal prediagnosis body mass index. Furthermore, only patients with normal prediagnosis body mass index experienced significant survival benefit with postdiagnosis aspirin use (hazard ratio, 0.59; 95% CI, 0.39-0.90).Conclusions and Relevance: In this cross-sectional study, our findings suggest potentially differential tumor development in the long-term physiologic host environment of obesity. Confirmation and further evaluation are needed to determine whether prediagnosis body mass index may be used to estimate the benefit from postdiagnosis aspirin use.

    View details for DOI 10.1001/jamanetworkopen.2022.36357

    View details for PubMedID 36239938

  • Access to American College of Surgeons Committee on Trauma-Verified Trauma Centers in the US, 2013-2019. JAMA Choi, J., Karr, S., Jain, A., Harris, T. C., Chavez, J. C., Spain, D. A. 2022; 328 (4): 391-393

    View details for DOI 10.1001/jama.2022.8097

    View details for PubMedID 35881133

  • Access to American College of Surgeons Committee on Trauma-Verified Trauma Centers in the US, 2013-2019 JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION Choi, J., Karr, S., Jain, A., Harris, T. C., Chavez, J. C., Spain, D. A. 2022; 328 (4): 391-393
  • Pathways and Barriers to Careers in Academic Clinical Cancer Prevention: a Qualitative Study. Journal of cancer education : the official journal of the American Association for Cancer Education Kok, M. Y., Chavez, J. C., Quesada, P. R., Adegoke, O. T., Chang, S. 2020


    National surveys document steady declines over time in interest in academic medicine and cancer prevention careers (Am J Prev Med 54(3):444-8, 2018). Through interviews with 16 academic cancer prevention physicians at one comprehensive cancer center, this study identifies motivations and barriers to physician careers in academic cancer prevention and proposes recommendations to increase recruitment. Participants reported that cancer prevention was vague to them early in training, impairing career exploration. Further, without role models and opportunities to learn about cancer prevention, many were ignorant of career options. Many had incorrect views about cancer prevention practice being mainly within the scope of primary care physicians, and some reported colleagues viewing the rigor of cancer prevention skeptically. However, all described notable experiences-in classes, with mentors, on research projects, or from encounters with patients, motivating them to pursue academic clinical cancer prevention regardless of challenges. Clearly, a lack of both information and guidance towards careers in clinical cancer prevention has been critical barriers to robust recruitment of physicians to the field and must be addressed urgently. Helping physicians earlier during training to both understand the value of prevention and cultivate their interests in it, particularly for clinical cancer prevention, would have widespread benefits.

    View details for DOI 10.1007/s13187-020-01921-z

    View details for PubMedID 33184755