2392. Identifying Associations Between Clostridium difficile Infection Incidence and Cancer Patients Receiving Chemotherapy.

Background Clostridium difficile infection (CDI) is a known major financial burden. In the cancer population, CDI, was identified to have a peak incidence of 17.2 per 1000 patients with increased morbidity, mortality and hospital length of stay. The need to further elucidate chemotherapy (CTX) with vs. without ABX usage as risk factors among other variables in cancer patients arises since this population is already baseline immunocompromised. Methods A retrospective case–control study (total of 1989 cancer patients who received CTX and had diarrhea at UTMB through 1/2016–1/2018) was completed. Subjects were screened using extensive inclusion and exclusion criteria, and assigned as CASES (with symptomatic (s) diarrhea from proven CDI) and as CONTROLS (had diarrhea but not attributed to CDI). A 1:1 subject matching using age, sex and past medical histories was completed and a total of 46 patients: 23 cases and 23 controls were compared and analyzed. McNemar's and independent t test of equal variance were used for association and comparing means/medians, respectively. Two-sided P value ≤ 0.05 was considered significant. Results The use of ABX (OR = 16, P = 0.0007) and having any degree of neutropenia at the time of diarrhea (OR = 12, P = 0.0055) among CTX patients had significant associations with having s CDI. Although no significant association between sCDI and # of days post CTX exposure (≥7 days (P = 0.1138) and ≥14 days post CTX (P = 0.1489) was identified, a mean of 12.83 ± 7.69 days passed before sCDI diagnosis in cases, compared with diarrhea diagnosis (7.46 ± 6.1 days) in controls (P = 0.0119). Meanwhile, receiving >1 CTX cycle (P = 1.000) and particular CTX types (P = ~ 0.0771–1.000) had no significant associations with sCDI diagnosis. Conclusion Any ABX usage post CTX exposure heavily predisposes to s CDI among cancer patients likely due to elimination of gut flora on an already predisposed population. Having any degree of neutropenia was also associated with having s CDI likely due to significant immunosuppression on top of being baseline cancer patients receiving CTX, and may have predictability benefits. The other variables may have not been significant due to expected limited cases because of low CDI incidence. Disclosures All authors: No reported disclosures. [ABSTRACT FROM AUTHOR]