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Item Analytical validation of a standardised scoring protocol for Ki67 immunohistochemistry on breast cancer excision whole sections: an international multicentre collaboration(Wiley, 2019-08) Leung, Samuel C. Y.; Nielsen, Torsten O.; Zabaglo, Lila A.; Arun, Indu; Badve, Sunil S.; Bane, Anita L.; Bartlett, John M. S.; Borgquist, Signe; Chang, Martin C.; Dodson, Andrew; Ehinger, Anna; Fineberg, Susan; Focke, Cornelia M.; Gao, Dongxia; Gown, Allen M.; Gutierrez, Carolina; Hugh, Judith C.; Kos, Zuzana; Lænkholm, Anne-Vibeke; Mastropasqua, Mauro G.; Moriya, Takuya; Nofech-Mozes, Sharon; Osborne, C. Kent; Penault-Llorca, Frédérique M.; Piper, Tammy; Sakatani, Takashi; Salgado, Roberto; Starczynski, Jane; Sugie, Tomoharu; van der Vegt, Bert; Viale, Giuseppe; Hayes, Daniel F.; McShane, Lisa M.; Dowsett, Mitch; Pathology and Laboratory Medicine, School of MedicineAims The nuclear proliferation marker Ki67 assayed by immunohistochemistry has multiple potential uses in breast cancer, but an unacceptable level of interlaboratory variability has hampered its clinical utility. The International Ki67 in Breast Cancer Working Group has undertaken a systematic programme to determine whether Ki67 measurement can be analytically validated and standardised among laboratories. This study addresses whether acceptable scoring reproducibility can be achieved on excision whole sections. Methods and results Adjacent sections from 30 primary ER+ breast cancers were centrally stained for Ki67 and sections were circulated among 23 pathologists in 12 countries. All pathologists scored Ki67 by two methods: (i) global: four fields of 100 tumour cells each were selected to reflect observed heterogeneity in nuclear staining; (ii) hot‐spot: the field with highest apparent Ki67 index was selected and up to 500 cells scored. The intraclass correlation coefficient (ICC) for the global method [confidence interval (CI) = 0.87; 95% CI = 0.799–0.93] marginally met the prespecified success criterion (lower 95% CI ≥ 0.8), while the ICC for the hot‐spot method (0.83; 95% CI = 0.74–0.90) did not. Visually, interobserver concordance in location of selected hot‐spots varies between cases. The median times for scoring were 9 and 6 min for global and hot‐spot methods, respectively. Conclusions The global scoring method demonstrates adequate reproducibility to warrant next steps towards evaluation for technical and clinical validity in appropriate cohorts of cases. The time taken for scoring by either method is practical using counting software we are making publicly available. Establishment of external quality assessment schemes is likely to improve the reproducibility between laboratories further.Item Analytical validation of a standardized scoring protocol for Ki67: phase 3 of an international multicenter collaboration(Nature, 2016) Leung, Samuel C. Y.; Nielsen, Torsten O.; Zabaglo, Lila; Arun, Indu; Badve, Sunil S.; Bane, Anita L.; Bartlett, John M. S.; Borgquist, Signe; Chang, Martin C.; Dodson, Andrew; Enos, Rebecca A.; Fineberg, Susan; Focke, Cornelia M.; Gao, Dongxia; Gown, Allen M.; Grabau, Dorthe; Gutierrez, Carolina; Hugh, Judith C.; Kos, Zuzana; Lænkholm, Anne-Vibeke; Lin, Ming-Gang; Mastropasqua, Mauro G.; Moriya, Takuya; Nofech-Mozes, Sharon; Osborne, C. Kent; Penault-Llorca, Frédérique M.; Piper, Tammy; Sakatani, Takashi; Salgado, Roberto; Starczynski, Jane; Viale, Giuseppe; Hayes, Daniel F.; McShane, Lisa M.; Dowsett, Mitch; Pathology and Laboratory Medicine, School of MedicinePathological analysis of the nuclear proliferation biomarker Ki67 has multiple potential roles in breast and other cancers. However, clinical utility of the immunohistochemical (IHC) assay for Ki67 immunohistochemistry has been hampered by unacceptable between-laboratory analytical variability. The International Ki67 Working Group has conducted a series of studies aiming to decrease this variability and improve the evaluation of Ki67. This study tries to assess whether acceptable performance can be achieved on prestained core-cut biopsies using a standardized scoring method. Sections from 30 primary ER+ breast cancer core biopsies were centrally stained for Ki67 and circulated among 22 laboratories in 11 countries. Each laboratory scored Ki67 using three methods: (1) global (4 fields of 100 cells each); (2) weighted global (same as global but weighted by estimated percentages of total area); and (3) hot-spot (single field of 500 cells). The intraclass correlation coefficient (ICC), a measure of interlaboratory agreement, for the unweighted global method (0.87; 95% credible interval (CI): 0.81–0.93) met the prespecified success criterion for scoring reproducibility, whereas that for the weighted global (0.87; 95% CI: 0.7999–0.93) and hot-spot methods (0.84; 95% CI: 0.77–0.92) marginally failed to do so. The unweighted global assessment of Ki67 IHC analysis on core biopsies met the prespecified criterion of success for scoring reproducibility. A few cases still showed large scoring discrepancies. Establishment of external quality assessment schemes is likely to improve the agreement between laboratories further. Additional evaluations are needed to assess staining variability and clinical validity in appropriate cohorts of samples.Item Assessing tumor infiltrating lymphocytes in solid tumors: a practical review for pathologists and proposal for a standardized method from the International Immuno-Oncology Biomarkers Working Group: Part 1: Assessing the host immune response, TILs in invasive breast carcinoma and ductal carcinoma in situ, metastatic tumor deposits and areas for further research(Wolters Kluwer, 2017-09) Hendry, Shona; Salgado, Roberto; Gevaert, Thomas; Russell, Prudence; John, Tom; Thapa, Bibhusal; Christie, Michael; van de Vijver, Koen; Estrada, M. V.; Gonzalez-Ericsson, Paula; Sanders, Melinda; Soloman, Benjamin; Solinas, Cinzia; Van den Eynden, Gert; Allory, Yves; Preusser, Matthias; Hainfellner, Johannes; Pruneri, Giancarlo; Vingiani, Andrea; Demaria, Sandra; Symmans, Fraser; Nuciforo, Paolo; Comerma, Laura; Thompson, E. A.; Lakhani, Sunil; Kim, Seong-Rim; Schnitt, Stuart; Colpaert, Cecile; Sotiriou, Christos; Scherer, Stefan; Ignatiadis, Michail; Badve, Sunil S.; Pierce, Robert; Viale, Giuseppe; Sirtaine, Nicolas; Penault-Llorca, Frederique; Sugie, Tomohagu; Fineberg, Susan; Paik, Soonmyung; Srinivasan, Ashok; Richardson, Andrea; Wang, Yihong; Chmielik, Ewa; Brock, Jane; Johnson, Douglas; Balko, Justin; Wienert, Stephan; Bossuyt, Veerle; Michiels, Stefan; Ternes, Nils; Burchardi, Nicole; Luen, Stephen; Savas, Peter; Klauschen, Frederick; Watson, Peter; Nelson, Brad; Criscitiello, Carmen; O'Toole, Sandra; Larsimont, Denis; de Wind, Roland; Curigliano, Giuseppe; André, Fabrice; Lacroix-Triki, Magali; van de Vijver, Mark; Rojo, Federico; Floris, Giuseppe; Bedri, Shahinaz; Sparano, Joseph; Rimm, David; Nielsen, Torsten; Kos, Zuzana; Hewitt, Stephen; Singh, Baljit; Farshid, Gelareh; Loibl, Sibylle; Allison, Kimberly; Tung, Nadine; Adams, Sylvia; Willard-Gallo, Karen; Horlings, Hugo; Gandhi, Leena; Moreira, Andre; Hirsch, Fred; Dieci, Maria; Urbanowicz, Maria; Brcic, Iva; Korski, Konstanty; Gaire, Fabien; Koeppen, Hartmut; Lo, Amy; Giltnane, Jennifer; Rebelatto, Marlon; Steele, Keith; Zha, Jiping; Emancipator, Kenneth; Juco, Jonathan; Denkert, Carsten; Reis-Filho, Jorge; Loi, Sherene; Fox, Stephen; Pathology and Laboratory Medicine, School of MedicineAssessment of tumor-infiltrating lymphocytes (TILs) in histopathologic specimens can provide important prognostic information in diverse solid tumor types, and may also be of value in predicting response to treatments. However, implementation as a routine clinical biomarker has not yet been achieved. As successful use of immune checkpoint inhibitors and other forms of immunotherapy become a clinical reality, the need for widely applicable, accessible, and reliable immunooncology biomarkers is clear. In part 1 of this review we briefly discuss the host immune response to tumors and different approaches to TIL assessment. We propose a standardized methodology to assess TILs in solid tumors on hematoxylin and eosin sections, in both primary and metastatic settings, based on the International Immuno-Oncology Biomarker Working Group guidelines for TIL assessment in invasive breast carcinoma. A review of the literature regarding the value of TIL assessment in different solid tumor types follows in part 2. The method we propose is reproducible, affordable, easily applied, and has demonstrated prognostic and predictive significance in invasive breast carcinoma. This standardized methodology may be used as a reference against which other methods are compared, and should be evaluated for clinical validity and utility. Standardization of TIL assessment will help to improve consistency and reproducibility in this field, enrich both the quality and quantity of comparable evidence, and help to thoroughly evaluate the utility of TILs assessment in this era of immunotherapy.Item Assessing Tumor-Infiltrating Lymphocytes in Solid Tumors: A Practical Review for Pathologists and Proposal for a Standardized Method from the International Immuno-Oncology Biomarkers Working Group Part 2 TILs in Melanoma, Gastrointestinal Tract Carcinomas, Non–Small Cell Lung Carcinoma and Mesothelioma, Endometrial and Ovarian Carcinomas, Squamous Cell Carcinoma of the Head and Neck, Genitourinary Carcinomas, and Primary Brain Tumors(Wolters Kluwer, 2017-11) Hendry, Shona; Salgado, Roberto; Gevaert, Thomas; Russell, Prudence A.; John, Tom; Thapa, Bibhusal; Christie, Michael; van de Vijver, Koen; Estrada, M. V.; Gonzalez-Ericsson, Paula I.; Sanders, Melinda; Solomon, Benjamin; Solinas, Cinzia; Van den Eynden, Gert G. G. M.; Allory, Yves; Preusser, Matthias; Hainfellner, Johannes; Pruneri, Giancarlo; Vingiani, Andrea; Demaria, Sandra; Symmans, Fraser; Nuciforo, Paolo; Comermo, Laura; Thompson, E. A.; Lakhani, Sunil; Kim, Seong-Rim; Schnitt, Stuart; Colpaert, Cecile; Sotiriou, Christos; Scherer, Stefan J.; Ignatiadis, Michail; Badve, Sunil S.; Pierce, Robert H.; Viale, Giuseppe; Sirtaine, Nicolas; Penault-Llorca, Frederique; Sugie, Tomohagu; Fineberg, Susan; Paik, Soonmyung; Srinivasan, Ashok; Richardson, Andrea; Wang, Yihong; Chmielik, Ewa; Brock, Jane; Johnson, Douglas B.; Balko, Justin; Wienert, Stephan; Bossuyt, Veerle; Michiels, Stefan; Ternes, Nils; Burchardi, Nicole; Luen, Stephen J.; Savas, Peter; Klauschen, Frederick; Watson, Peter H.; Nelson, Brad H.; Criscitiello, Carmen; O'Toole, Sandra; Larsimont, Denis; de Wind, Roland; Curigliano, Giuseppe; André, Fabrice; Lacroix-Triki, Magali; van de Vijver, Mark; Rojo, Federico; Floris, Giuseppe; Bedri, Shahinaz; Sparano, Joseph; Rimm, David; Nielsen, Torsten; Kos, Zuzana; Hewitt, Stephen; Singh, Baljit; Farshid, Gelareh; Loibl, Sibylle; Allison, Kimberly H.; Tung, Nadine; Adams, Sylvia; Willard-Gallo, Karen; Horlings, Hugo M.; Gandhi, Leena; Moreira, Andre; Hirsch, Fred; Dieci, Maria V.; Urbanowicz, Maria; Brcic, Iva; Korski, Konstanty; Gaire, Fabien; Koeppen, Hartmut; Lo, Amy; Giltnane, Jennifer; Rebelatto, Marlon C.; Steele, Keith E.; Zha, Jiping; Emancipator, Kenneth; Juco, Jonathan W.; Denkert, Carsten; Reis-Filho, Jorge; Loi, Sherene; Fox, Stephen B.; Pathology and Laboratory Medicine, School of MedicineAssessment of the immune response to tumors is growing in importance as the prognostic implications of this response are increasingly recognized, and as immunotherapies are evaluated and implemented in different tumor types. However, many different approaches can be used to assess and describe the immune response, which limits efforts at implementation as a routine clinical biomarker. In part 1 of this review, we have proposed a standardized methodology to assess tumor-infiltrating lymphocytes (TILs) in solid tumors, based on the International Immuno-Oncology Biomarkers Working Group guidelines for invasive breast carcinoma. In part 2 of this review, we discuss the available evidence for the prognostic and predictive value of TILs in common solid tumors, including carcinomas of the lung, gastrointestinal tract, genitourinary system, gynecologic system, and head and neck, as well as primary brain tumors, mesothelioma and melanoma. The particularities and different emphases in TIL assessment in different tumor types are discussed. The standardized methodology we propose can be adapted to different tumor types and may be used as a standard against which other approaches can be compared. Standardization of TIL assessment will help clinicians, researchers and pathologists to conclusively evaluate the utility of this simple biomarker in the current era of immunotherapy.Item Assessment of Ki67 in Breast Cancer: Updated Recommendations From the International Ki67 in Breast Cancer Working Group(Oxford University Press, 2021) Nielsen, Torsten O.; Leung, Samuel C. Y.; Rimm, David L.; Dodson, Andrew; Acs, Balazs; Badve, Sunil; Denkert, Carsten; Ellis, Matthew J.; Fineberg, Susan; Flowers, Margaret; Kreipe, Hans H.; Laenkholm, Anne-Vibeke; Pan, Hongchao; Penault-Llorca, Frédérique M.; Polley, Mei-Yin; Salgado, Roberto; Smith, Ian E.; Sugie, Tomoharu; Bartlett, John M. S.; McShane, Lisa M.; Dowsett, Mitch; Hayes, Daniel F.; Pathology and Laboratory Medicine, School of MedicineKi67 immunohistochemistry (IHC), commonly used as a proliferation marker in breast cancer, has limited value for treatment decisions due to questionable analytical validity. The International Ki67 in Breast Cancer Working Group (IKWG) consensus meeting, held in October 2019, assessed the current evidence for Ki67 IHC analytical validity and clinical utility in breast cancer, including the series of scoring studies the IKWG conducted on centrally stained tissues. Consensus observations and recommendations are: 1) as for estrogen receptor and HER2 testing, preanalytical handling considerations are critical; 2) a standardized visual scoring method has been established and is recommended for adoption; 3) participation in and evaluation of quality assurance and quality control programs is recommended to maintain analytical validity; and 4) the IKWG accepted that Ki67 IHC as a prognostic marker in breast cancer has clinical validity but concluded that clinical utility is evident only for prognosis estimation in anatomically favorable estrogen receptor-positive and HER2-negative patients to identify those who do not need adjuvant chemotherapy. In this T1-2, N0-1 patient group, the IKWG consensus is that Ki67 5% or less, or 30% or more, can be used to estimate prognosis. In conclusion, analytical validity of Ki67 IHC can be reached with careful attention to preanalytical issues and calibrated standardized visual scoring. Currently, clinical utility of Ki67 IHC in breast cancer care remains limited to prognosis assessment in stage I or II breast cancer. Further development of automated scoring might help to overcome some current limitations.Item The tale of TILs in breast cancer: A report from The International Immuno-Oncology Biomarker Working Group(Springer Nature, 2021-12-01) El Bairi, Khalid; Haynes, Harry R.; Blackley, Elizabeth; Fineberg, Susan; Shear, Jeffrey; Turner, Sophia; de Freitas, Juliana Ribeiro; Sur, Daniel; Amendola, Luis Claudio; Gharib, Masoumeh; Kallala, Amine; Arun, Indu; Azmoudeh-Ardalan, Farid; Fujimoto, Luciana; Sua, Luz F.; Liu, Shi-Wei; Lien, Huang-Chun; Kirtani, Pawan; Balancin, Marcelo; El Attar, Hicham; Guleria, Prerna; Yang, Wenxian; Shash, Emad; Chen, I-Chun; Bautista, Veronica; Do Prado Moura, Jose Fernando; Rapoport, Bernardo L.; Castaneda, Carlos; Spengler, Eunice; Acosta-Haab, Gabriela; Frahm, Isabel; Sanchez, Joselyn; Castillo, Miluska; Bouchmaa, Najat; Md Zin, Reena R.; Shui, Ruohong; Onyuma, Timothy; Yang, Wentao; Husain, Zaheed; Willard-Gallo, Karen; Coosemans, An; Perez, Edith A.; Provenzano, Elena; Gonzalez Ericsson, Paula; Richardet, Eduardo; Mehrotra, Ravi; Sarancone, Sandra; Ehinger, Anna; Rimm, David L.; Bartlett, John M. S.; Viale, Giuseppe; Denkert, Carsten; Hida, Akira I.; Sotiriou, Christos; Loibl, Sibylle; Hewitt, Stephen M.; Badve, Sunil; Symmans, William Fraser; Kim, Rim S.; Pruneri, Giancarlo; Goel, Shom; Francis, Prudence A.; Inurrigarro, Gloria; Yamaguchi, Rin; Garcia-Rivello, Hernan; Horlings, Hugo; Afqir, Said; Salgado, Roberto; Adams, Sylvia; Kok, Marleen; Dieci, Maria Vittoria; Michiels, Stefan; Demaria, Sandra; Loi, Sherene; International Immuno-Oncology Biomarker Working Group; Pathology and Laboratory Medicine, School of MedicineThe advent of immune-checkpoint inhibitors (ICI) in modern oncology has significantly improved survival in several cancer settings. A subgroup of women with breast cancer (BC) has immunogenic infiltration of lymphocytes with expression of programmed death-ligand 1 (PD-L1). These patients may potentially benefit from ICI targeting the programmed death 1 (PD-1)/PD-L1 signaling axis. The use of tumor-infiltrating lymphocytes (TILs) as predictive and prognostic biomarkers has been under intense examination. Emerging data suggest that TILs are associated with response to both cytotoxic treatments and immunotherapy, particularly for patients with triple-negative BC. In this review from The International Immuno-Oncology Biomarker Working Group, we discuss (a) the biological understanding of TILs, (b) their analytical and clinical validity and efforts toward the clinical utility in BC, and (c) the current status of PD-L1 and TIL testing across different continents, including experiences from low-to-middle-income countries, incorporating also the view of a patient advocate. This information will help set the stage for future approaches to optimize the understanding and clinical utilization of TIL analysis in patients with BC.Item Update on tumor-infiltrating lymphocytes (TILs) in breast cancer, including recommendations to assess TILs in residual disease after neoadjuvant therapy and in carcinoma in situ: A report of the International Immuno-Oncology Biomarker Working Group on Breast Cancer(Elsevier, 2017-10-09) Dieci, Maria Vittoria; Radosevic-Robin, Nina; Fineberg, Susan; van den Eynden, Gert; Ternes, Nils; Penault-Llorca, Frederique; Pruneri, Giancarlo; D’Alfonso, Timothy M.; Demaria, Sandra; Castaneda, Carlos; Sanchez, Joselyn; Badve, Sunil; Michiels, Stefan; Bossuyt, Veerle; Rojo, Federico; Singh, Baljit; Nielsen, Torsten; Viale, Giuseppe; Kim, Seong-Rim; Hewitt, Stephen; Wienert, Stephan; Loibl, Sybille; Rimm, David; Symmans, Fraser; Denkert, Carsten; Adams, Sylvia; Loi, Sherene; Salgado, Roberto; Pathology and Laboratory Medicine, School of MedicineMorphological evaluation of tumor-infiltrating lymphocytes (TILs) in breast cancer is gaining momentum as evidence strengthens the clinical relevance of this immunological biomarker. TILs in the post-neoadjuvant residual disease setting are acquiring increasing importance as a stratifying marker in clinical trials, considering the raising interest on immunotherapeutic strategies after neoadjuvant chemotherapy. TILs in ductal carcinoma in situ, with or without invasive carcinoma, represent an emerging area of clinical breast cancer research. The aim of this report is to update pathologists, clinicians and researchers on TIL assessment in both the post-neoadjuvant residual disease and the ductal carcinoma in situ settings. The International Immuno-Oncology Working Group proposes a method for assessing TILs in these settings, based on the previously published International Guidelines on TIL Assessment in Breast Cancer. In this regard, these recommendations represent a consensus guidance for pathologists, aimed to achieve the highest possible consistency among future studies.