e18564 Background: Telephone consultation has emerged as an alternative method for outpatient medical follow-up during the COVID-19 pandemic, reinforcing the necessary distancing measures. However, there are multiple factors that the medical team must contend with, which could limit the monitoring of patients. Methods: We retrospectively analyzed the remote medical consultation database of a university-based oncology referral center in northeast Mexico. The telephone calls were made from the medical center by specialized health personnel. The data obtained correspond to the monitoring conducted over six months. Results: We included 1,140 patients in the analysis, of which 79% were women and 21% were men; the median age was 55 years. All individuals had a pathology-confirmed diagnosis of cancer. The main oncological diagnoses were breast, cervix, and prostate cancer which corresponded to 46, 13, and 7% of the cases, respectively. Ninety-four percent of cases corresponded to cancer surveillance, while the remaining 6% were receiving active oncological treatment, administered orally. Ninety-three percent of the patients were from the city of Monterrey and its metropolitan area, 6% came from the rest of the municipalities of the state of Nuevo Leon, and 1% were from other states of the Mexican Republic. Ninety-eight percent of the patients had a public health insurance as a method of coverage for health services, while 2% received care through private health insurance. At remote follow-up, only 53% of the patients responded to the telephone calls, none of them reported a diagnosis or any symptom of SARS-CoV-2 infection. Among the 536 patients who had a telephone communication failure, 68% did not respond to the call after 4 attempts, while in 32% of these cases the number provided by the patient was incorrect or non-existent. Conclusions: The high rates of failure to establish telephone communication documented in our population of patients with cancer is a worrying phenomenon. As the COVID-19 pandemic progresses worldwide, we must seek to establish measures to optimize logistics for more effective remote communication, to achieve the best possible outcomes.