Serine/threonine kinase 11 (STK11) mutations and immunotherapy resistance in patients with non-small cell lung cancer

e15055

Background: There is immune evasion and resistance to checkpoint inhibitors (CPI). Programmed death-ligand 1 (PD-L1) and Tumor mutational burden (TMB) might help us predict response, but we have not yet validated biomarkers that can predict resistance. Mutations (mut) in STK11 can induce epigenetic changes that confer proliferative advantages to cancer cells and preliminary reports have suggested that they can confer resistance to CPI. We investigated the role of STK11 and KRAS mut as markers of poor response to CPI in patients (pts) with non-small cell lung cancer (NSCLC). Methods: Clinical outcomes of 127 pts with stage IIIB-IV NSCLC who were tested for KRAS and STK11 mut and received CPI were evaluated for progression free survival (PFS) and overall survival (OS). For statistical analysis log-rank tests were used to compare OS and PFS, chi-squared tests were used to compare 1-year survivals and proportions among different variables, and Kaplan-Meier survival curves were used to report OS and PFS. Results: Of the 127 pts: 31 had STK11 mut, 14 had STK11+KRAS mut (SKM group), and 10 pts were in the SKMP group (STK11+KRAS mut+PD-L1 (-)). Median age was 65y (27-88y). Males were 54% of the total and 30 pts (24%) were Hispanic (H). STK11 mut patients had an inferior PFS and OS as shown in table. Pts in SKM and SKMP groups had worse outcomes; however, not all the P values were significant. The difference in OS and 1-year OS were very impressive and significant when compared between the SKMP group (4m and 30%) and the wild type group (15m and 73%). There were no significant differences in clinical outcomes for H vs. non-H White pts. Conclusions: The presence of STK11 mut were associated with shorter OS/PFS in NSCLC pts treated with CPIs, proving its utility as a negative predictive marker. This can be enhanced combining STK11 and KRAS mut and possibly adding PD-L1 (-). These findings are consistent with recent studies that have reported STK11 mut as a genomic driver of primary resistance. Due to the small sample size further studies will be needed to validate these findings. [Table: see text]

Bevacizumab for the treatment of brain radionecrosis in cancer patients

e19352

Background: Brain radionecrosis (BRN) occurs as a result of radiation therapy for brain tumors or metastatic brain lesions. BRN is characterized by an increase in permeability and disruption of the blood-brain barrier (BBB). There are currently no standard treatment options for BRN. While the mechanism of BRN is unknown, it is hypothesized that there is an inflammatory reaction of the local tissue to radiation which results in a continuous process involving endothelial cell dysfunction. This leads to tissue hypoxia and increased vascular endothelial growth factor (VEGF) which in turn causes capillary leakage, progressive BBB dysfunction, and cerebral edema. Bevacizumab (BEV), a humanized monoclonal antibody with action against VEGF, has recently been used in some studies for the treatment BRN. BEV essentially blocks VEGF from reaching its targets on the endothelium, thus making it an ideal treatment modality for BRN. Methods: The primary purpose of this study is to assess the effectiveness and safety of BEV for the treatment of BRN. Fifteen patients (pts), 14 diagnosed with lung cancer and one with breast cancer, that had BRN and treated with BEV between January 2014 and November 2019 were identified from Memorial Cancer Institute's database. A retrospective chart review analyzing pts's age, sex, BEV dose, dosing frequency, number of treatments received, medication-related adverse effects, and clinical benefit was conducted. Brain imaging pre-treatment and after four cycles of therapy were compared to assess the efficacy of BEV. Pts who exhibited clinical benefit (complete response (CR), partial response (PR), or stable disease (SD)) received an additional four cycles of treatment. Results: The median age was 65 years (y) (49-78y) and 10/15 (67%) of pts were female. Clinical benefit was achieved in 13/15 (87%) of pts. The most frequent dosing regimen administered was 10 mg/kg every two weeks and the median number of cycles given was eight cycles (1-12). Treatment with BEV was well tolerated with eight pts (53%) experiencing BEV-related Grade 2 or less adverse effects (AE), including hypertension (27%), proteinuria (13%), thrombocytopenia (7%), and mild nose bleeds (7%). There were no Grades 3-5 AE. Conclusions: This study demonstrates that there is a clinical benefit when administering BEV for the treatment of BRN. BEV was well tolerated and has an acceptable safety profile.

A multidisciplinary quality improvement project to improve the safety of oral chemotherapy in hospitalized patients

110

Background: At the University of Illinois Hospital and Health Sciences System (UIC), inpatient IV chemotherapy administration occurs in the setting of specific protocols and multidisciplinary safety assessments while oral chemotherapy agent (OCA) inpatient administration occurs less formally. Baseline 8 week review of 174 admissions to the oncology service revealed that of 16 patients (9.2%) on outpatient OCA, 50% received OCAs while inpatient, with 12. 55% having a formal chemotherapy note in place. We aimed to increase the percentage of administered OCAs with associated provider generated chemotherapy notes from 12.5% to 75% over 16 weeks. Methods: A multidisciplinary task force comprised of oncology providers, clinical pharmacy, nursing leadership, and information technology was assembled. An actual and ideal process map was created, and using tools such as affinity sorting and root cause analysis, interventions were implemented focusing on residents (knowledge of OCA), nurses (documentation and policy adherence), pharmacists (education, policy adherence) and IT team (order modification). A standardized multidisciplinary hospital wide process was implemented for OCA ordering, administration, documentation, and patient education. A novel REDCap (research electronic data capture) auditing procedure was designed by which a weekly pharmacy report of every oral chemotherapy order at UI Health is automatically generated. Results: Between June and September 2015, a total of 67 OCA administration reports were audited. OCA notes were associated with OCA administration in 58% of cases in June, 100% in July, 78% in August and 93% in September. Furthermore, OCA notes were entered within 4 hours of OCA ordering in 58% of cases in June, 54% in July and 78% of the cases in August and September. No adverse events were reported. Conclusions: At the University of Illinois Hospital and Health Sciences System, a multidisciplinary team designed and implemented a standardized OCA administration, ordering, and documentation process focused on safe, appropriate and timely inpatient OCA administration. A novel REDCap auditing process assisted the team to identify the areas in need of optimization.