George A. Dominguez 1, John Roop 1, Alexander Polo 1, Anthony Campisi 1, Dmitry I. Gabrilovich 2, and Amit Kumar 1
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1 Using artificial intelligence to distinguish subjects with prostate cancer (PCa) from benign prostate hyperplasia (BPH) through immunophenotyping of MDSCs and lymphocyte cell populations George A. Dominguez 1, John Roop 1, Alexander Polo 1, Anthony Campisi 1, Dmitry I. Gabrilovich 2, and Amit Kumar 1 1 Anixa Biosciences, Inc., San Jose, CA; 2 The Wistar Institute, Philadelphia, PA
2 Disclosure Information George Dominguez Employee - Anixa Biosciences, Inc. Stock Options - Anixa Biosciences, Inc. 2
3 What can MDSCs tell us? Indicative of Solid Tumors and Severity Predictors of Immunotherapy Response? Thyroid Breast Cancer Prostate Cancer Angell et al. Thyroid 26(3) Colorectal Diaz-Montero et al. Canc Immunol Immunotherapy 58(1) Chi et al. Int J Clin Exp Med 7(10) Prostate Cancer Kitano et al. Cancer Immunol Res 2(8) CTLA-4 Responses in Late Stage Melanoma Lung Zhang et al. PLoS ONE 8(2) Chen et al. Oncology Letters Hossain et al. Clin Cancer Res 21(16) Meyer et al. Cancer Immunol Immunother 63:
4 Question Can we use MDSCs as an indicator for higher risk prostate cancer (PCa) and distinguish from benign prostatic hyperplasia (BPH)/lower risk PCa? 4
5 LOX1-APC SSC-A CD11b-VioGreen HLA-DR-PerCP-Vio700 CD15-PE-Vio770 CD14-APC-Vio770 CD14-APC-Vio770 SSC-A CD4-PE CD3-PE-Vio770 SSC-A FSC-H Live/Dead-DAPI CD14-APC-Vio770 SSC-A FSC-H Live/Dead-DAPI What are we measuring? Myeloid Panel (8 Markers) Lymphoid Panel (5 Markers) Live single cells Live single cells M-MDSCs HLA-DR-PerCP- Vio700 CD4+ T Cells B Cells emdscs Natural Killer Cells CD8+ T Cells Lin(CD3/CD19/CD56) PE CD11b VioGreen CD14 APC-Vio770 CD15 PE-Vio770 CD16 PE-Vio615 CD33 VioBright 515 HLA-DR PerCP-Vio700 LOX-1 APC Live/Dead DAPI CD33-VioBright 515 LOX1 + PMN- MDSCs CD15-PE-Vio770 Lin(CD3/CD19/CD56)-PE PMN- MDSCs CD15-PE-Vio770 SSC-A CD33-VioBright 515 CD56-VioBright 515 CD8-APC-Vio770 CD3 PE-Vio770 CD4 PE CD8 APC-Vio770 CD19 APC CD56 VioBright 515 Live/Dead DAPI 5 CD19-APC
6 Clinical Characteristics and Categorization Prospective blood collection processed within hours All subjects were already scheduled to undergo a transrectal ultrasound guided prostate (TRUSP) biopsy Subjects not included if they had: previous history of cancer (excluding active surveillance) any previous medical intervention for Pca on active treatment for BPH Characteristic PCa BPH HD Total Median Age Age Range Gleason Score (3+4) 14 7 (4+3) 15 >8 18 Tumor Stage T1c 43 T2a 2 Unknown
7 e M D S C (% P B M C ) P M N -M D S C (% P B M C ) M -M D S C (% P B M C ) Traditional Gating: Manual Counting - MDSCs 4 * H D B P H P C a (G 6 ) H D B P H P C a (G 6 ) H D B P H P C a (G 6 ) Simple cell counts can provide information about trends, but can only categorize some subjects *The dotted line represents the 75 th percentile for HD values (75% specificity) Healthy Donor (HD) n = 73 Benign Prostatic Hyperplasia (BPH) n = 48 Prostate Cancer (PCa) n = 73 7
8 Our Question Can we use machine learning (neural networks) to analyze the flow cytometry data to categorize patients? Training Test Sample Category A Healthy Category B Cancer Healthy or Cancer 8
9 The Inputs Event Counts FCS File CSV File (Event counts for each channel) Multidimensional Space CD33-VioBright 515 CD15-PE-Vio770 CD14-APC-Vio770 Lin(CD3/CD19/CD56) SSC-A CD14-APC-Vio770 DAPI SSC-A Lin(CD3/CD19/CD56)-PE SSC-A LOX1-APC LOX1 CD16 HLA-DR-PerCPVio700 CD14-APC-Vio770 HLA-DR-PerCP-Vio700 CD15-PE-Vio770 Live single cells HLA-DR CD11b-VioGreen SSC-A FSC-H Live/Dead-DAPI CD14 CD15-PE-Vio770 CD15 CD33-VioBright 515 The Neural Network does not see gates, markers, or fluorophores it just sees numbers CD33 CD11b 9
10 Manual Gating not enough *PCa (Adenocarcinoma) = Gleason 6 Healthy Donor vs Prostate Cancer BPH vs Prostate Cancer AUC < 0.6 AUC <
11 Manual Gating not enough *PCa (Adenocarcinoma) = Gleason 6 Healthy Donor vs Prostate Cancer BPH vs Prostate Cancer AUC = AUC =
12 Measured Measured Using a Neural Network is Superior *PCa (Adenocarcinoma) = Gleason 6 Healthy Donor vs Prostate Cancer BPH vs Prostate Cancer Classified PCa HD PCa 16 2 HD 1 17 Sens. (%) 88.9 Spec. (%) 94.4 Prec. (%) 94.1 Acc. (%) 91.7 Method AUROC emdscs PMN-MDSCs M-MDSCs Neural Network Classified PCa BPH PCa 6 2 BPH 0 8 Sens. (%) 75 Spec. (%) 100 Prec. (%) 100 Acc. (%) 87.5 Method AUROC emdscs PMN-MDSCs M-MDSCs Neural Network
13 What is a clinical application of this technology? 13
14 Clinical Application: Confirmatory Testing PSA is not reliable (large numbers of false positives) Majority of biopsies are negative 20% to 50% of men diagnosed through screening may be over diagnosed Gold Standard for Confirming Prostate Biopsy (invasive/stressful) Risks of Screening and Overdiagnosis/Overtreatment 1% of prostate biopsies result in hospitalization 1 in 5 men who undergo prostatectomy may develop long-term urinary incontinence 2 in 3 men may experience long-term erectile dysfunction 1 in 6 men may experience long-term bothersome bowel symptoms Source: US Preventive Services Task Force. Screening for Prostate Cancer: US Preventive Services Task Force Recommendation Statement. JAMA. 2018, 319(18):
15 Clinical Application: Confirmatory Testing for PCa Bx At-Risk: PSA, DRE, Family Hx, Age, Race NN1 HD Active Surveillance? BPH/ LR-PCa Active Surveillance? HR-PCa HR-PCa Biopsy? NN2 Final Decision by Clinician PSA DRE Family Hx Race Age Other 15
16 e M D S C (% P B M C ) P M N -M D S C (% P B M C ) M -M D S C (% P B M C ) Clinical Characteristics and Manual Counting Additional samples were collected + 41 PCa 5 *** * ** + 41 BPH + 43 Male HD Characteristic PCa BPH HD Total Median Age Age Range Gleason Score (3+4) 26 7 (4+3) 22 >8 22 Tumor Stage T1c 75 T2a 5 T2c 2 Unknown H D B P H + G 7 (3 + 4 ) G > 7 (3 + 4 ) H D B P H + G 7 (3 + 4 ) G > 7 (3 + 4 ) 5 0 H D B P H + G 7 (3 + 4 ) Still simple cell counts can provide information about trends, but not really categorize subjects G > 7 (3 + 4 ) 16
17 Measured Clinical Application: Confirmatory Testing Gleason 7(4+3) Gleason 7(3+4) + BPH Biopsy Recommended Classified Needs Biopsy Does Not Need Biopsy Sens. (%) 90 Spec. (%) 52 Prec. (%) Acc. (%) Biopsy Not Recommended Classified 26 BPH/LR-PCa samples as Biopsy Not Recommended potentially reduce the number of unnecessary biopsies Mis-classified 1 out of the 10 HR-PCa samples other factors may still suggest biopsy subject had an abnormal DRE and a PSA > 20 ng/ml 17
18 Conclusions We demonstrated that machine learning can be used to analyze flow cytometry data of MDSC and lymphocytes We have applied this technique to distinguish between HD/PCa and BPH/PCA in a small number of samples We also demonstrated that this has the potential to reduce the number of unnecessary prostate biopsies (confirmatory testing) PSA results have high false positive rate Over 1 million prostate biopsies performed annually - overwhelmingly negative 18
19 Future Work Incorporate DRE results? PSA? Age? Race? Identify the critical relationships between cell populations that are used to make the classifications unexpected relationships? Can this technique be applied to other flow cytometer data sets with different cancers? (retrospective analysis) Can this be used for predicting tumor recurrence, treatment and/or immunotherapy responses? Collaborative projects 19
20 Thank You! Anixa Biosciences San Jose Philadelphia Amit Kumar, PhD Alexander Polo John Roop Anthony Campisi The Wistar Institute Dmitry I. Gabrilovich, MD, PhD Flow Cytometry Core Facility Clinical Collaborators New Jersey Urology Adam Perzin, MD Renee Haney, CCRC Brianna Florentine, CRC Jennifer Pilallis, CRC MD Anderson Cancer Center at Cooper Robert Somer, MD Mary Schafer Noopur Advant Ahna Donahue 20
21 Questions? Visit our poster (O2) tonight if you have more questions or interested in more details. 21
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