ABSTRACT
Background: Due to immunosuppression, influenza virus and S. pneumoniae infections in cancer patients (pts) are responsible of a 4 times higher morbidity and mortality rates. Inadequate data are available about efficacy, safety, timing and immunogenicity of influenza (I) and pneumococcal (P) vaccine (vax) in pts undergoing active oncologic treatment. Nevertheless, the main Oncology societies recommend I and P vax in cancer pts and their family members (FMs). Materials and Methods: This is a single institution prospective study conducted at L. Sacco Hospital (Milan) between Sept 20 and Apr 21. The aim was to evaluate efficacy and safety of vax. Pts with diagnosis of tumor, age>18ys, in active antineoplastic treatment and FMs age>18ys were included. Each pt received I+P vax on the same day of therapy. Pts were compared with a control group of FMs, with age- and gender-adjusted logistic regression. Monthly monitoring was scheduled to register any Adverse Events (AEs) after injection (local and systemic AEs), episode of Influenza Like Illness (ILI), pneumococcal infection, access to Emergency department (ED) or Hospital admission (HA) and delay of treatment (DT). Results: 194 pts (63y median age, 67.5% female) and 140 FMs (59y median age, 49% female) were enrolled. CANCER: 92% solid and 8% hematological malignancy, 69% metastatic stage. TREATMENTS: 54% =1 previous line of therapy;38% chemotherapy, 31% target, 17% chemo+target, 14% hormone therapy. VAX: 47% pts and 72% FMs received I-vax for first time. I+P-vax were administered in 100% pts and 49% FMs. LOCAL AEs: I-vax: 34% pts and 19.6% FMs (p=0.01), P-vax: 35.7% pts and 20.7% FMs (p=0.11). The most common was pain in site of injection. SISTEMIC AEs: 19.6% pts and 8.5% FMs (p=0.11);the most frequent was fatigue. EFFICACY: ILI were recorded in 8.8% pts (3 had a HA and 1 a DT) and 3.6% FMs (p=0.04). No PI was recorded. Type of therapy, previous treatment and the use of steroid don't significantly impact on vax safety and efficacy. Conclusions: Despite the atypical season, I+P vax are safe and effective in cancer pts. The limited number of ILI events observed could be referred to vax but also to COVID-19 risk prevention and mitigation measures. No differences in efficacy and safety were observed between the 2 groups, except for local I-vax AEs. Moreover, the vax administration in the Oncology department, a wide vaccination coverage was achieved (>70% of cancer pts), reducing the pressure on territorial healthcare system.