Seroprevalence and immunological memory against SARS-CoV-2 in lung cancer patients (p): SOLID study.
Authors: Provencio Mariano , Rodriguez-Abreu Delvys , Lorduy Ana Collazo , Serrano Gloria Mª , Ortega Granados Ana Laura , Aguado Carlos , Lopez Vivanco Guillermo , Guirado Maria , Estival Anna , Jimenez Munarriz Beatriz , Arasanz Hugo , Coves Juan , Majem Margarita , Massuti Bartomeu , Vazquez-Estevez Sergio , Juan-Vidal Oscar , Lucia Clara , del Barco Edel , Cobo Manuel 
Published: June 2021

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Background: Coronavirus disease 2019 (COVID-19) is diagnosed by detecting the virus by reverse transcription polymerase chain reaction (RT-PCR). The majority of p go on to develop antibodies (Ab) against viral proteins. However, it is not known how long these antibodies last nor whether cancer treatments could affect the duration of immune response. The prognosis and greater or lesser vulnerability of the oncological population are also unknown. Methods: This prospective, longitudinal, multicenter serological study in the setting of SARS-CoV-2 was carried out in 50 Spanish hospitals. Eligibility criteria was a diagnosis of any thoracic cancer. The first determinations were performed between April 21, 2020 and June 3, 2020, either for p in follow up or in active treatment. Between September 10, 2020, and November 20, 2020, the second antibody (Ab) determination was performed in all previously seropositive p. Clinical and treatment data were collected, as was their clinical situation at study end. Study objectives were to prospectively determine seroprevalence in unselected lung cancer p during the first wave of the pandemic; the natural history of these p; the persistence of immunity more than 4 months after first determination; protection or lack thereof against reinfection after this period, and the nature of such protection; and the influence of treatments on maintenance or loss of immunity. Results: Of 1,500 p studied, 128 were seropositive, representing an overall prevalence of 8.5% seropositivity [95% confidence interval [CI], 7.2%, 10.1%]. Seventy-five percent were in active cancer treatment. COVID-19 infection was suspected in 47.7% [95% CI, 38.8%, 56.6%]. A second determination was performed on average 4.5 months later [IQR: 4; 5] and obtained for 104 of the initially seropositive p (81%). A second determination could not be obtained in 24 p, the majority due to death caused by disease progression (73%). In the second determination, IgG was not detected in 30.8% (32/104) of p. The severity of the infection, the need for hospitalization (p: 0.032) and the presence of symptoms at diagnosis (p: 0.02), including fever (p: 0.005) and nasal congestion (p: 0.005), were associated with persistence of immunity in the second determination. No variables or treatments received were associated with Ab loss. At time of last follow-up among those p for whom a second determination was performed, 89% (93 p) had completely recovered from the virus, with no lasting after effects. Only 1 of the 128 (0.78%) seropositive p had died from COVID-19. Conclusions: The prevalence of infection in lung cancer p is similar to that of the general population. Immunity against SARS-CoV-2 does not appear to be compromised by treatment, persisting beyond 4 months. Neither do mortality rates appear to be particularly high in this unselected population.