The journey of stage III and IV non-small cell lung cancer patients in the Brazilian private healthcare system: a retrospective study

Non-small cell lung cancer (NSCLC) is still diagnosed at late stages in Brazil. The availability of newer treatment options has changed patient management, however, few real-world data have been published since then. This is a population-based retrospective cohort study that aims to evaluate the characteristics of stage III/IV NSCLC patients and their journey in the Brazilian private healthcare system. Patients aged ≥18 years, residing in Brazil who had their first medical appointment between 2016 and 2018 were included in the study. The sociodemographic and clinical characteristics of the patients and time intervals of interest were described. A total of 10,394 patients were analyzed. The majority of the patients were male (58.5%) with a median age of 64.0 (IQR = 58.0 - 71.0) years. In relation to characteristics of the disease, most of the tumors were characterized as adenocarcinomas (52.3%) and diagnosed at stage IV (72.2%). Most patients arrived at the hospital with an established NSCLC diagnosis, while 45.7% were diagnosed at the first medical appointment in the hospital or later. For patients who were diagnosed at the first medical appointment or later, a median interval of 15.0 (IQR = 6.0 - 33.0) days was observed between the first medical appointment and the diagnosis. The first treatment was given after a median of 25.0 (IQR = 6.0 - 49.0) days after diagnosis for patients without a prior diagnosis, and 57.0 (IQR: 33.0 - 98.0) days for patients with a prior diagnosis. The most common treatments were chemotherapy alone (33.8%), chemotherapy combined with radiotherapy (21.5%), radiotherapy alone (13.1%), adjuvant or neoadjuvant treatment (9.3%), surgery (3.3%), and immunotherapy (0.7%; alone or combined). At the end of follow-up (September, 2020), 52.3% of the patients had died. Despite having more treatment options in the private sector, data show that there is a need to improve access to technologies.

148. Imipenem-Relebactam activity and genotypic characteristics of Carbapenem-resistant Enterobacterales and Pseudomonas aeruginosa Isolates from Latin American Infections - Study for Monitoring Antimicrobial Resistance Trends (SMART) 2017 – 2020

Background

Imipenem/relebactam (IMI/REL) is a combination of Imipenem with Relebactam, an inhibitor of class A and C β-lactamases and has been approved in the US and EU, but not in Latin America.

This report evaluates the in vitro activity of IMI/REL and comparators against Latin America (LATAM) Enterobacterales and P. aeruginosa (PSA) and the frequency of carbapenemase encoding genes (CEG) among gram-negative bacilli (GNB) isolated through the SMART Program (2017-2020).

Methods

21606 nonconsecutive GNB isolates were collected in 10 LATAM countries. MICs for amikacin (AK), ceftazidime-avibactam (C-A), ceftolozane/tazobactam (C/T) and IMI/REL were determined by broth microdilution and interpreted by CLSI; a subset of Enterobacterales and P. aeruginosa carbapenem resistant was selected for characterization of carbapenemase encoding genes by PCR followed by DNA sequencing.

Results

Escherichia coli (N=9872; EC) tested susceptible to > 96% of all antibiotics analyzed; for P. aeruginosa (N=4528), C/T and C-A had the best susceptibility rates (85.7 and 86.6% respectively); for Enterobacter cloacae (N=1091; ECL) and Klebsiella pneumoniae (N=6115; KPN), we note that only IMI/REL and C-A were ≥ 95%.

Profile of 2845 carbapenem resistant isolates was analysed and the main isolated agent in most countries was KPN, corresponding to 55% (1470), except in Mexico, Panama and Venezuela where PSA was the main carbapenemase producer.

The blakpc-2, 3 were found in KPN 76.7, 79.2, 53.3, 52.1 and 85.3% in Argentina, Brazil, Colombia, Ecuador and Puerto Rico, respectively; Guatemala, Mexico, Venezuela presented blaNDM-1 in 74.3, 44.1 and 51.4%.

Among ECL blakpc-2 (35.7%-Brazil, 48.2%-Colombia) and blaNDM-1(45.7%-Mexico) were most frequent, blaVIM-24 (16.6%) and blaIMP-18 (38.8%) were observed in Venezuela and Puerto Rico and in the latter, we observed first time reported blakpc-45 in 27.7 %.

PSA expressed blakpc-2 (33.33%- Colombia), Chile and Venezuela blaVIM-2 (44.3%, 58.8%); blaspm-1 occurred only in Brazil (6.9%).

Most common carbapenemase-producing bacteria in LATAM (n=2845)

Antimicrobial susceptibility of Enterobacterales and P. aeruginosa (full data analysis=21606)

Most Frequent CEG detected among carbapenemase producing isolates in Latin American countries (Genotypical sample analyzed n=2845)

Conclusion

The frequency of CEG is a threat in LATAM, mostly in Enterobacterales, whereas PSA as expected, has a lower frequency, but still a concern.

In LATAM, IMI/REL has shown relevant activity against CEG producers, showing it is an option for treatment infections caused by MDR strains.

Disclosures

Gustavo Mizuno, PharmD, MSD Brazil: Employee Thales Polis, MD, MSD Brazil: Employee Jacqueline Ferrari, MD, MSD Brazil: Employee Jacqueline Pavia, MD, MSD COLOMBIA: EMPLOYEE Elisa Beirão, MD, MSD BRAZIL: Grant/Research Support Ana C. Gales, MD, MSD BRAZIL: Grant/Research Support Felipe Tuon, MD, MSD BRAZIL: Grant/Research Support Alexandre Alcantara, PharmD, MSD BRAZIL: EMPLOYEE Paula M. Batista, PharmD, MSD BRAZIL: EMPLOYEE.

1392. Evaluation of the Impact of a Single-dose Hepatitis A Vaccination in Brazil: a time-series analysis

Background

Brazil has transitioned from an intermediate to low hepatitis A virus endemic country, increasing the risk of severe Hepatitis A (HepA) disease. To control transmission, the HepA vaccine, MSD, was introduced in the National Childhood Immunization Program (NIP) in 2014 for children aged 12-24 months and extended to children under 5 years old in 2017. We evaluated the impact of the vaccination on the HepA incidence, associated healthcare resource utilization (HCRU), and costs.

Methods

We conducted an observational, retrospective study using Brazilian National Public Health Data (DATASUS). An interrupted time-series analysis was conducted for incidence rates (IR) of laboratory- or clinically-confirmed Hep A cases. Using a negative binomial regression model, we assessed changes in annual HepA IR between pre- (2010-2013) and post- (2015-2018) HepA vaccination periods and compared to predicted counterfactual rates without HepA vaccination. We compared HCRU and cost of Hep A-associated hospitalizations and outpatient procedures between pre- and post- HepA vaccination periods.

Results

Between 2010 and 2018, 32,295 Hep A cases occurred across all ages. Among the NIP target children aged 1-4 years, HepA vaccination was associated with an immediate HepA IR decrease (-52,5% of level change) and with a decrease in slope (-7.7% vs -67.6% per year for pre- and post-periods, respectively, Figure 1). We observed a similar trend in non- HepA vaccination target children aged 5-14 years with -57.1% of level change and slope change from -3.4% (pre- HepA vaccination) to -53.7% (post- HepA vaccination) per year (Table 1). Across all age groups, 14,468 Hep A cases were averted when compared to predicted counterfactual rates (Table 2). Overall, HepA-related hospitalization rate dropped 64% after NIP introduction of vaccination resulting in a cost reduction of 55%. The total number of outpatient procedures claimed among HepA-diagnosed patients reduced 18% with 42% cost reduction.

Figure 1: time-series analyses of Hepatitis A incidence rate (IR) for NIP target population. Monthly number of hepatitis A cases observed over the study period (black line). Predicted trend based on the pre- HepA vaccination (red line) and post- HepA vaccination (blue line) monthly cases

Table 1: Time-series analysis of the impact of the hepatitis A vaccination on the incidence rate level of change, according to age group

Table 2: Number of observed, predicted counterfactual, and averted hepatitis A cases in the post- HepA vaccination period (2015-2018), according to age group.

Conclusion

In Brazil, the single-dose hepatitis A vaccine childhood program effectively reduced the Hepatitis A incidence, HCRU and associated-costs in vaccinated and in some non-vaccinated age groups.

Disclosures

Ana Luiza Bierrenbach, MD, MSc, PhD, MSD Brazil (Grant/Research Support, Scientific Research Study Investigator, Research Grant or Support) Yoonyoung Choi, PhD, MS, RPh, Merck (Employee) Paula M. Batista, BSc, MSD Brazil (Employee) Fernando Serra, MD, MSD Brazil (Employee) Cintia Parellada, MD, PhD, MSD Brazil (Employee) Guilherme Julian, BSc, MSc, IQVIA (Employee)MSD (Consultant, Research Grant or Support) Karina Nakajima, BSc, PhD, IQVIA (Employee)MSD (Consultant, Research Grant or Support) Thais Moreira, MD, MSc, MSD Brazil (Employee)