A CAMPUS CML ANALYSIS: 1 YEAR OF THE PANDEMIC COVID-19 INFECTION IN CHRONIC MYELOID LEUKEMIA IN ITALY

Background: An outbreak of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) started in December 2019 in the province of Hubei in China. Italy was one of the most affected countries with many cases diagnosed already in February 2020 and a lockdown was declared on March 9th. Limited information has been reported with regard to the impact of the pandemic on chronic myeloid leukemia (CML) patients. Aims: To observe the temporal course of Covid-19 infection and the characteristics of positive patients. Methods: The Campus CML Italian group carried out a first survey on the management of CML patients during the lockdown. We launched a second survey during the pandemic phases 2 and 3, between May 2020 and January 2021. Results: We collected retrospective information on 8665 CML patients followed at 46 centers throughout the country. Within this cohort, we recorded 217 Covid-19-positive symptomatic patients (2.5%). Most patients (57%) were diagnosed as having Covid-19 infection between September 2020 and January 2021;30% were diagnosed in phase 1 (March-April 2020) and only 13% between May and August. Most of the positive patients were between 50 and 65 years (35%), while 26% had less than 50 years, 18.8% were between 65 and 75 years, and 11% had more than 75 years. A male prevalence was observed (73%). The median time from CML diagnosis to Covid-19 infection was 6 years (3 months-18 years). Fifty-six percent of patients presented concomitant comorbidities at the time of infection. When Covid-19 was diagnosed, 27% of patients were receiving imatinib, 26% nilotinib, 18% dasatinib, 8% ponatinib, 8% bosutinib, 2% asciminib, while 11% were not receive treatment. At the time of the infection, 74% of patients were in molecular remission, 6% in complete cytogenetic remission, 3% in partial cytogenetic remission, 6% in complete hematological response and 11% in treatment-free remission. At diagnosis, 28% of patients presented fever and respiratory symptoms, 13% cough, 10% isolated fever, 13% ageusia, 12% anosmia, 4% had more than 1 symptom, while 20% were completely asymptomatic. Twenty-one patients (9.6%) required hospitalization without the need of respiratory assistance, 18 (8.2%) were hospitalized for respiratory assistance, 8 (3.6%) were admitted to an ICU, while 150 patients (69%) were only quarantined. Twenty-three percent of patients discontinued TKI therapy during the infection. The source of contagion was familiar in 49% of patients, 18% due to work, 3% in healthcare professionals, whereas in 30% was not known. Twelve patients died due to Covid-19 infection with a mortality rate of 5.5% in the positive cohort and of 0.13% in the whole cohort. Five patients reported consequences post-infection: 1 patient reported a Guillan-Barre syndrome, 1 patient a maculopapular rash, 1 patient a pulmonary fibrosis, 1 patient a bacterial endocarditis and 1 patient was diagnosed as having alterations of the microcirculation. Summary/Conclusion: This study reports the 1-year of data on the Covid- 19 infection in a specific hematological malignancy in the European country first hit by the pandemic. A longer follow-up is needed to further define the impact of Covid-19 infection sequelae in CML patients.