Abstract Background: Alarmed by low rates of cancer screening in disenfranchised communities and medical deserts in Southern California, City of Hope launched a cancer prevention and control training program to broadly disseminate cancer screening and healthy living educational resources to Health Educators who serve the most vulnerable within our Catchment areas. Methods: The project was IRB approved as exempt came internally from City of Hope. To increase cancer prevention and uptake of cancer screening, we focused on training of Community Health Workers (CHW) from Federally Qualified Health Centers (FQHC’s), community hospitals, faith-based organizations. This community co-designed training included Cancer 101 , on best practice for Breast, Cervical, Colorectal, Lung, and Prostate screening, and Clinical and Biospecimen Studies and SB 987. Complete and online redcap enrollment survey, along with 2 brief pre and post surveys per series topic. The presentations and surveys will be facilitated by COE staff. Trainees completed surveys via RedCap. Surveys will be conducted via Redcap. Results: TTT series trained 101 trainees on 8 topics. Trainees included: Asian (14.9%), Black/African-American (6.9%), Latino/Hispanic (73.3%), Pacific Islander (2.0%), White/European American (5, 5.0%), Mix (3.0%). The gender identities trained were Male (10.9%), Female (87.1%), Transgender: Female to Male (2.0%). Facilitators of screening included Someone to talk about worries/fears about cancer (73.0%), Someone to go with and help at the appointment (53.0%), Paid time off from work (63.0%), Clinical provider recommendation/encouragement (57.0%), Free/ Low cost exams (81.0%), Insurance to pay for exams (68.0%), Free transportation (64.0%), Child care services (53.0%), In-language educational materials (62.0%), Language Interpretation services (51.0%), Community education programs (66.0%), Gift Cards or Incentives (4.0%).The participants' education level was mostly college educated (64.0%), high school (33.0%), and less than high school (3.0%). The top 3 cancers affect our community the most are breast, colon, and lung. Conclusion: The conclusion is community partners are ready to be engaged and trained in cancer prevention and screening. Cancer centers, leveraging their COE, can respond to this call to action. Citation Format: Kimlin Ashing, Lauren D'Souza, Brenda Gascon, James Morrison, Veronica Tejada, Alexis Garden, Jose Gomez, Sophia Yeung. Train the trainer series in Southern California a call to action for cancer prevention and screening [abstract]. In: Proceedings of the 17th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2024 Sep 21-24; Los Angeles, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2024;33(9 Suppl):Abstract nr C179.