Every year 1.5 million new cancer cases are diagnosed in Latin America and the Caribbean (LAC). Of these, about 40 % could be prevented. Health illiteracy has been identified as a main barrier for cancer prevention. Primary healthcare professionals (HCP) are key in cancer prevention as they are the first entry point of the population into the healthcare system. The LAC Code Against Cancer 1st edition aims to improve health literacy and awareness of cancer prevention in the LAC population, through building capacity of primary HCP.The definition and development of the learning objectives, curriculum, structure, and evaluation of an online learning program for primary HCP was led by a dedicated group of experts from the LAC Code Against Cancer project. A pedagogical guideline and a template to ensure harmonization across topics were produced to guide the program development. Two rounds of internal revisions and an editorial process were performed.An online competency-based microlearning program for primary HCP was produced, taking the LAC Code Against Cancer as a basis. The competences addressed in the curriculum are core knowledge, communication skills, decision-making and applying knowledge to real-world situations. A comprehensive evaluation to assess acquisition of these competences, based on the Miller's Pyramid, was designed with three data collection points: a) immediately before, to assess baseline knowledge and skills; b) immediately after, to determine acquired competences; and c) at 3-6 months follow-up, to assess performance in daily practice. The e-learning will be freely available in the Virtual Campus for Public Health of the Pan American Health Organization in Spanish, English, and Portuguese.Primary HCP, perceived as trustworthy sources of information, are key actors to increase the population's awareness and literacy on cancer prevention. Building capacity of these professionals has the potential to increase dissemination and impact of the LAC Code Against Cancer by prompting communication with the public and offering personalized actionable preventive messages through counselling.