United States


Introduction: Lung adenocarcinoma is the most prevalent non-small cell lung cancer. Up to 15% of lung adenocarcinomas are characterized by mutations in the epidermal growth factor receptor (EGFR) gene. Osimertinib, an EGFR tyrosine kinase inhibitor, is an effective method of treatment in EGFR-mutant lung cancer. However, osimertinib resistance is frequent. The mechanisms of Osimertinib are heterogenous but here we describe a new case of osimertinib resistant carcinosarcoma. 
Case history: A 63-year-old woman presented with headaches, right arm weakness, and gait instability. Radiographic evaluation showed a left parietal lobe mass, enlarged hilar lymph nodes, and numerous lung nodules. CT-guided biopsy of one lung nodule revealed an invasive adenocarcinoma which expressed TTF-1 but was negative for p-40 immunostaining. Tumor next generation sequencing revealed a rare exon 19 EGFR (E747_A750del) deletion. The patient was treated with stereotactic radiosurgery for brain metastasis followed by osimertinib immunotherapy. More than a year later, lead to a recurrence of the patient’s symptoms. Repeat radiographic evaluation showed new mediastinal lymphadenopathy. Fine needle aspiration of the enlarged mediastinal lymph nodes revealed carcinosarcoma with minimal adenocarcinoma component. A repeat tumor next generation sequencing confirmed the same EGFR exon 19 deletion (E746_A750del) in addition to TP53/Rb mutation and a high tumor mutational burden. 
Conclusion: This case demonstrates another association of osmertinib resistance in pulmonary adenocarcinoma with a specific EGFR mutation. This case is unique as it also documents histologic transformation of EGFR-mutated lung adenocarcinoma into a carcinosarcoma as a possible underlying mechanism of osimertinib resistance. 


AMA Research Challenge 2022

EGFR-mutated lung adenocarcinoma transformation to carcinosarcoma as an osimertinib resistance mechanism

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Charles Lopresto, DO

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Welcome to the largest national, multi-specialty research event featuring research from 750 medical students, residents and fellows, and international medical graduates.


poster

Abstract Title: Characterizing Outcomes of Immune Checkpoint Inhibition Treatment in Patients with advanced Renal Cell Carcinoma

Michael Pannell1, Maishara Muquith1, David Hsieh2, MD
1. University of Texas Southwestern Medical School
2. University of Texas Southwestern, Internal Medicine, Division of Hematology-Oncology

Background: Immune checkpoint inhibitors (ICIs) have become a standard of care treatment for patients with metastatic renal cell carcinoma (mRCC), with previous retrospective studies demonstrating potential benefits with increased tumor sensitivity to sequential treatment after ICI failure. An increasingly important area of investigation is characterizing the outcomes of ICI treatment and subsequent therapies in patients with advanced renal cell carcinoma. We examine characteristics of ICI treatment outcomes in a real-world cohort.

Methods: This IRB approved retrospective cohort study included patients with advanced renal cell carcinoma treated with palliative-intent PD-1/PD-L1 inhibitors at a single institution between 2016 and 2019. Clinical data including age, sex, cancer type, and treatment lines were obtained from the electronic medical record. Radiographic responses were determined from available CT/MRI studies and categorized using Response Evaluation Criteria In Solid Tumors 1.1 criteria. Response categories include complete response (CR), partial response (PR), stable disease (SD), and progressive disease (PD).

Results: Of 110 patients with mRCC that initiated ICI therapy between 2016 and 2019, 95 were treated with palliative intent and had subsequent imaging to evaluate their response. The overall objective response rate was 18.8% (n=18), with 18 patients demonstrating a partial response to treatment, 26 demonstrating stable disease, and 52 showing disease progression. ICI therapy as 1st line palliative treatment demonstrated the highest objective response rate of 27.5% (n=14), decreasing for subsequent treatment lines (13% and 0% for 2nd and 3rd+). Progression Free Survival (PFS) and Overall Survival (OS) were measured across ICI type and treatment line, with overall median values being 82 and 926 days, respectively. Additionally, patients were treated with either nivolumab monotherapy, nivolumab/ipilimumab combination, or pembrolizumab concurrent axitinib. Those treated with nivolumab monotherapy had a median PFS=79.5 days (n=32) and a median OS=1068.5 days (15 cases ongoing at the time of data analysis), compared to nivolumab/ipilimumab median PFS=83 days (n=55) and median OS=706 days (22 ongoing), and pembrolizumab median PFS=169 days (n=9) and median OS=559 (4 ongoing).

Conclusion: This study suggests that specific ICI therapies and treatment line may be associated with objective response and survival in patients with mRCC. Further identifying these associations could result in improved clinical outcomes.

Immune Checkpoint Inhibition Treatment Outcomes in Advanced Renal Cell Carcinoma

Background: Impact of race in advanced stage non-small cell lung cancer (NSCLC) patients treated with immune checkpoint inhibitors (ICIs) is conflicting. Few studies have significant representation of Black patients, and these studies lack detail on access to care, such as time to treatment initiation (TTI). Our study sought to examine racial disparities in TTI, overall survival (OS), and progression-free survival (PFS) using a population that was almost equally Black and White. 

Methods: This was an IRB approved retrospective cohort study of stage IV NSCLC patients > 18 years receiving immunotherapy at our center between 2014 and 2021. Associations between demographic characteristics and median values were examined using Chi-square tests. Kaplan-Meier curves and multivariate Cox proportional hazards model determined predictors of OS and PFS. Analyses were done using IBM PSAW (SPSS v.28) with p-value < 0.05 indicating significance.

Results: Of 194 patients who met the eligibility criteria, 42.3% were Black (n=82). On Kaplan-Meier analysis, no difference was observed between White and Black patients with respect to median PFS (6.30 versus 7.90 months; log-rank p=0.977) and OS (9.50 versus 11.77 months; log-rank p=0.457). On multivariate analysis, there was no difference in PFS (HR: 0.98; 95% CI: 0.68,1.43; p=0.928) or OS (HR: 1.01; 95% CI: 0.67,1.51; p=0.969) when controlling for race, sex, age at diagnosis, pack years, marital status, insurance type, histology, and Charlson Comorbidity Index (CCI). There was no difference in treatment selection between White and Black patients (p=0.184; chi-square), nor was there a difference in median time to overall treatment initiation (28.00 days versus 22.00 days; p=0.159). A difference was evident for immunotherapy initiation (34.00 versus 27.00 days; p=0.042) between White and Black patients respectively.

Conclusion: Although race was expected to permeate patient outcomes, OS and PFS did not differ between Black and White patients. The significantly shorter time to immunotherapy treatment for Black patients is an unexpected finding. In our study, we highlighted that equitable access reduces disparities, bridges gaps in care, and improves patient outcomes, regardless of race. Further studies with equitable representation of diverse racial groups are warranted to better understand how race impacts cancer outcomes.

Impact of race on outcomes of advanced stage non-small cell lung cancer in an equal access setting

MSIDx: Pan-cancer detection of microsatellite instability through targeted microsatellite sequencing enables immunotherapy

Abstract Title: Non-responder prediction in patients with advanced urothelial carcinoma using machine learning.

Background: Post FDA approval immunotherapy for cancer becomes widely used for locally advanced or metastatic urothelial carcinomas (1) with 16.5% of patients suffering Grade 3-5 side effects (2) from treatment. The current investigation wanted to classify patients that will not respond to immune checkpoint inhibitors (ICI) and potentially prevent side effects for these patients.

Methods: Pretreatment normalized ribonucleic acid Sequencing (RNASeq), clinical and other data for patients with advanced UC receiving PD-1 axis inhibitors were downloaded from gene expression omnibus (GEO) datasets project PRJNA735749 (3). This data also included responses to treatment data. Responders were categorized as patients with either complete response (CR), partial response (PR), or stable disease (SD) while non-responders comprised patients with progressive disease (PD). With a 70/30 training/test data split we developed four distinct algorithms were developed using a complete or targeted gene expression profile (high vs low expression with non-RNASeq data; total mutational burden (TMB), clinical data, and FGFR mutational status. The performance of each of the algorithms was assessed by comparing a matric of test set accuracy, sensitivity, specificity, positive predictive values (PPV), negative predictive values (NPV), and area under the receiver-operating curves.

Results: A total of 89 patients (from a total of 103) had complete RNASeq, DNA, and clinical data. The complete RNASeq + non-RNASeq data showed test set; accuracy (18.5%), sensitivity (100%), specificity (0.0%), PPV (25%), NPV (UD*). The targeted RNASeq + non-RNA Seq data showed test set; accuracy (70.4%), sensitivity (0.0%), specificity (100%), PPV (undefined), NPV (70.4%). The targeted RNASeq (Hi/Low cutoff) + non- RNASeq data using a Multilayer Perceptron (MLP) classifier showed test set; accuracy (81.5%), sensitivity (20.0%), specificity (95.5%), PPV (50.0%), NPV (84.0%). The targeted RNASeq (Hi/Low cutoff) + non-RNASeq data using a TensorFlow (TF) classifier showed test set; accuracy (77.8%), sensitivity (20.0%), specificity (90.9%), PPV (33.3%), NPV (83.3%).

Conclusion: The MLP/deep-learning classifier for targeted normalized high vs low RNA expression with TMB, clinical characteristics, and FGFR mutational status shows better overall results compared to other algorithms. However, these results need external validation and with a larger dataset and we may also be able to predict responders in these patients.


Non-responder prediction in patients with advanced urothelial carcinoma using machine learning

Background 
In patients diagnosed with cancer, pain can interfere with daily functioning, affecting overall quality of life. The predictors of pain in patients with cancer are not well-delineated. Further, pain has been associated with inflammation, yet previous research attempting to understand this link has been limited secondary to the lack of inclusion of other covariates associated with inflammation. The aims of this study were to describe pain intensity and interference in patients with cancer, investigate the predictors and consequences of pain, and examine the associations between pain and cytokines while covarying factors associated with inflammation. 

Methods
This study was a secondary analysis of baseline data from three prospective studies conducted between 2008-2019 at the University of Pittsburgh Medical Center Cancer Center. Patients completed questionnaires assessing sociodemographic characteristics, pain, depression, sleep, and fatigue. Serum levels of cytokines IL-1alpha, IL-1beta, TNF-alpha, IL-10, IL-2, and IFN-gamma were assessed. Analyses of Variance, Chi-square analyses, and linear regression were performed to test the hypotheses. 


Results
Of the 779 participants, the mean age was 63.5 years (S.D.=11.02), 57.8% male, 90.6% Caucasian. 67.3% of patients reported pain, of which 50.4% of patients reported was cancer-related. Significant predictors of pain intensity and interference included lower education level (beta=-2.800, 95% CI=[-4.374,-1.227], p=0.01) and a diagnosis of hepatocellular carcinoma or cholangiocarcinoma (beta=-0.947, 95% CI=[-1.551,-0.343], p=0.002). After adjusting for sociodemographic, disease-specific, and treatment-related factors, pain significantly predicted higher levels of depression (beta=0.587, 95% CI=[0.425,0.749], p<0.001), fatigue (beta=-0.858, 95% CI=[-1.031,-0.684], p<0.001), and fewer hours of sleep per night (beta=-0.055, 95% CI=[-0.088,-0.023], p=0.001). After adjusting for sociodemographic, disease-specific, and treatment-related factors, pain was not significantly related to serum levels of IL-1alpha, IL-1beta, TNF-alpha, IL-10, IL-2, or IFN-gamma.

Conclusion
Nearly one-third of patients reported cancer-related pain, which was linked to poorer quality of life. Pain, however, was not found to be associated with inflammatory biomarkers, warranting further research into underlying biological mechanisms of pain and related symptoms of depression, fatigue, and poor sleep. Given that pain predictors included lower education level and diagnosis of liver cancer, interventions should be designed and implemented for these patients with the greatest need for pain management.

Pain, Inflammation, and Psychosocial Factors in the Context of Cancer

Predictors of hematologic response and survival with stem cell transplantation in patients with AL amyloidosis: a 25-year longitudinal study

Background: RT recipients have a 5-6-fold increased risk of renal cell carcinoma (RCC). Post-RT RCCs usually arise from the native kidneys but may rarely develop in the allograft. We analyzed the incidence and clinical outcomes of patients with RA RCC at Memorial Hermann Hospital, Texas Medical Center.

Methods: We performed a single center retrospective study of patients with RA RCC who underwent transplantation between January 1, 1999, and December 31, 2019. The following data were collected: Baseline demographic variables, cause of end stage renal disease (ESRD), duration of dialysis prior to RT, interval from RT to RCC diagnosis, RCC stage, histologic subtype, and clinical outcome post RCC treatment.

Results: Among 1998 RT recipients, 7 patients (0.3%) developed RCC in the RA, of whom 4 were men. Subject races included White (n=3), Black (n=2), Hispanic (n=1), and Asian (n=1). The median age was 56 years (Range, 18-66). Causes of ESRD included diabetic or hypertensive nephropathy (n=3), congenital renal dysplasia (n=1), Alport syndrome (n=1), IgA nephropathy (n=1) and Henoch Schoenlein purpura (n=1). Median duration of dialysis prior to RT was 48 months (range, 1–120). Median time to RCC diagnosis post-RT was 108 months (range, 48-180). Histologies included clear cell (n=5) and papillary (n=2) RCC. Majority (n=6) were nonsmokers. 
Six patients (85%) had stage I disease and all of them had deterioration in renal function that prompted renal imaging and biopsy that led to RCC diagnosis. One patient had stage IV disease at diagnosis and presented with hematuria. All seven patients had evidence of chronic allograft nephropathy. One patient had BK Virus nephropathy in the allograft. Six patients underwent transplant nephrectomy while one had cryotherapy. Three patients went back on dialysis while three patients underwent a retransplantation. None had RCC recurrence post retransplantation. Three patients died: 1 each with sepsis, COVID 19 and metastatic RCC.

Conclusion: Although rare, RA RCC can adversely affect long term survival. Chronic inflammation in the setting of RA nephropathy and iatrogenic immunosuppression are believed to be the main driving factors. 



Renal Allograft (RA) Renal Cell Carcinoma in Renal Transplant (RT) Recipients: A Single Center Retrospective Review

Abstract Title:
Does definitive local therapy have a role in select HER2+de novo metastatic breast cancer patients treated with dual anti HER2 blockade?

Background:
The role of surgery with curative intent in HER2+de novo metastatic breast cancer (dnMBC) is uncertain in the era of dual antibody therapy. We sought to determine from existing retrospective data current practice patterns if an association exists between surgery to the primary tumor and improved survival in HER2+dnMBC patients treated with dual anti-HER2 blockade, accounting for selection bias.

Methods:
This study employed data from the National Cancer Database (NCDB) from the years 2013 to 2015. Study inclusion was limited to adult women with HER2+dnMBC, who received immunotherapy/biologic response modifier drugs (BRM) as a first line treatment. Patients who received both systemic therapy and surgery to the primary breast tumor and patients who received systemic therapy alone were analyzed in two groups. Chi-square test for discrete variables and Wilcox on RankSum test for numeric variables was used to compare the two groups based on patient, tumor, and treatment characteristics. The primary endpoint was overall survival from the time of diagnosis to the time of death.

Results:
928 women with HER2+dnMBC treated with BRM were identified with 43.5% (n=404) receiving surgery and 56.5% (n=524) receiving systemic therapy alone. The 3-year overall survival was superior for the surgery group (74.1%, 95% CI 67.9–79.2%) compared to the no surgery group (53.3%; 95% CI 47.6–58.6%). The no surgery group had median overall survival of 39.8 months (95% CI 34.1–44.9), while the surgery group had not yet reached median overall survival.

Conclusion:
In a group of HER2+dnMBC patients receiving systemic treatment in the era of dual antibody therapy, patients who underwent surgery had a superior 3-year survival rate than those who did not. There may be a role for a prospective trial in HER2+dnMBC patients with an excellent response to dual HER2 blockade to investigate the contribution of curative intent local therapy to the primary tumor compared to systemic therapy alone.


Should we operate?: The role of surgery in HER2+ de novo metastatic breast cancer treated with dual anti-HER2+ blockade

Background
Adolescent and Young Adult (AYA) cancer patients have been historically understudied. Many improvements in survival observed for pediatric and older adult patients have not been paralleled in the AYA population. Contributing factors of this discrepancy may involve unique challenges AYA patients face, including poor investigative research, limited access to care, or financial insecurity. Several studies have identified that these challenges disproportionally impact AYA patients belonging to racial minority and lower socioeconomic (SES) groups, thus leading to worsened survival outcomes. We aimed to investigate differences in survival among AYA patients of different races, ethnicities, and SES treated within the same health care system, Kaiser Permanente Southern California (KPSC).

Methods
We identified patients, aged 15-39, diagnosed with the fourteen most common cancers in this age group at KPSC between the years 2010-2018, yielding 6,463 patients. Cancers included were breast, testis, leukemia, Non-Hodgkin and Hodgkin lymphoma, melanoma, colon, cervical, uterine, renal, brain, soft tissue, rectosigmoid, ovarian, stomach, and bone. The Neighborhood Deprivation Index (NDI), a validated measure of socioeconomic deprivation obtained from geocoded data of home addresses, was used as a marker of SES. Race, ethnicity, and survival data were obtained from the Electronic Health Record. We examined differences in survival rates for all cancer types, and breast cancer and leukemia separately, for NDI quartiles and racial and ethnic groups. 

Results
Patients residing in the two most deprived areas have a higher all-cause mortality rate compared to those living in the two least deprived areas for all cancer types combined (p=0.0012). We did not detect a significant difference in survival rate between different NDI groups for patients with leukemia. White patients, compared to non-White patients, had statistically significant improved survival rates (p=0.0000036) for all cancer types combined. Black and Hispanic patients with leukemia had lower survival rates than Asian/Pacific Islander and White subjects with leukemia (p=0.0052). No difference was found among breast cancer patients of different NDI quartiles or races/ethnicities.

Conclusion
Patients experiencing higher levels of deprivation have lower survival rates compared to less deprived patients. White patients had significantly higher survival rates than Black, Hispanic, or Asian/Pacific Islander patients for all cancer types combined.


Socioeconomic and Racial Disparities in Survival for Adolescent and Young Adult Cancer Patients

Background

Staging is devised to assess prognosis and direct the management of cancers. Although staging systems don't necessarily confirm chronological progression, there is near consensus that advanced stages are 'later' versions of a given cancer. Tumor Mutational Burden (TMB) is a metric measuring proliferative state, representing a “molecular clock” (Vogelstein) of sorts and a surrogate for chronology. TMB is commonly provided to oncologists as essential clinical data, however proper interpretation is still evolving. We hypothesized that (i) advanced-stage is a qualitative rather than chronologic indicator, (ii) proliferation rates will be mirrored in TMB, and (iii) TMB will correlate with clinical virulence.


Methods

(i) We mined the TCGA database (cbioportal.org) for incremental increases in TMB relative to increasing neoplasm clinical stage from 558 samples (Breast, Colon, Renal cell, Pancreatic, Cervical). (ii) We compared the TMB in Burkitt's with follicular lymphoma representing lymphoma proliferative spectrum. (iii) We compared the TMB in cutaneous squamous carcinoma (CSC) with Acute Myelogenous Leukemia, representing indolent versus aggressive malignancies, respectively.


Results

(i) The 95% Confidence Intervals (CI) surrounding the median TMB were overlapping without statistical significance across all stages within every histology examined. (ii) To our surprise, the TMB 95% CI were overlapping between the 2 subsets of B-cell lymphoma examined. (iii) TMB was substantially higher in CSC (median of ~800) compared with 8 in AML.


Conclusion

Assuming the validity of Vogelstein’s molecular clock model, mutational probing does not support the concept that a stage IV malignancy is a chronologically delayed manifestation of a given neoplasm. Rather, we suggest that aggressive/metastatic cancers are inherently 'different' with unique abilities. We also posit that cells that live for years (follicular lymphoma) can accumulate comparable TMB levels as Burkitt's because the limited life span in Burkitt's (days to weeks) precludes the accumulation of high TMB. Finally, a malignancy’s clinical outcome cannot be discerned from the degree or mutability— which is rationally a predictor of immune susceptibility. It's noteworthy that the observed levels of mutations in CSC, reflective of sun-induced mutagenicity, is more than 3-fold of that reported for melanoma (~274) and may explain the rarity of metastatic CSC resulting from immune clearance of metastases.

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EGFR-mutated lung adenocarcinoma transformation to carcinosarcoma as an osimertinib resistance mechanism

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