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Hammarström K, Nunes L, Mathot L, Mezheyeuski A, Lundin E, Korsavidou Hult N, Imam I, Osterlund E, Sjöblom T, Glimelius B. Clinical and genetic factors associated with tumor response to neoadjuvant (chemo)radiotherapy, survival and recurrence risk in rectal cancer. Int J Cancer 2024; 155:40-53. [PMID: 38376070 DOI: 10.1002/ijc.34880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 01/14/2024] [Accepted: 01/16/2024] [Indexed: 02/21/2024]
Abstract
Rectal cancer poses challenges in preoperative treatment response, with up to 30% achieving a complete response (CR). Personalized treatment relies on accurate identification of responders at diagnosis. This study aimed to unravel CR determinants, overall survival (OS), and time to recurrence (TTR) using clinical and targeted sequencing data. Analyzing 402 patients undergoing preoperative treatment, tumor stage, size, and treatment emerged as robust response predictors. CR rates were higher in smaller, early-stage, and intensively treated tumors. Targeted sequencing analyzed 216 cases, while 120 patients provided hotspot mutation data. KRAS mutation dramatically reduced CR odds by over 50% (odds ratio [OR] = 0.3 in the targeted sequencing and OR = 0.4 hotspot cohorts, respectively). In contrast, SMAD4 and SYNE1 mutations were associated with higher CR rates (OR = 6.0 and 6.8, respectively). Favorable OS was linked to younger age, CR, and low baseline carcinoembryonic antigen levels. Notably, CR and an APC mutation increased TTR, while a BRAF mutation negatively affected TTR. Beyond tumor burden, SMAD4 and SYNE1 mutations significantly influenced CR. KRAS mutations independently correlated with radiotherapy resistance, and BRAF mutations heightened recurrence risk. Intriguingly, non-responding tumors with initially small sizes carried a higher risk of recurrence. The findings, even if limited in addition to the imperfect clinical factors, offer insights into rectal cancer treatment response, guiding personalized therapeutic strategies. By uncovering factors impacting CR, OS, and TTR, this study underscores the importance of tailored approaches for rectal cancer patients. These findings, based on extensive analysis and mutation data, pave the way for personalized interventions, optimizing outcomes in the challenges of rectal cancer preoperative treatment.
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Affiliation(s)
- Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Luís Nunes
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Lucy Mathot
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Artur Mezheyeuski
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
- Molecular Oncology Group, Vall d'Hebron Institute of Oncology, Barcelona, Spain
| | - Emma Lundin
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | | | - Israa Imam
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Emerik Osterlund
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
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Mezheyeuski A, Backman M, Mattsson J, Martín-Bernabé A, Larsson C, Hrynchyk I, Hammarström K, Ström S, Ekström J, Mauchanski S, Khelashvili S, Lindberg A, Agnarsdóttir M, Edqvist PH, Huvila J, Segersten U, Malmström PU, Botling J, Nodin B, Hedner C, Borg D, Brändstedt J, Sartor H, Leandersson K, Glimelius B, Portyanko A, Ponten F, Jirström K, Micke P, Sjöblom T. An immune score reflecting pro- and anti-tumoural balance of tumour microenvironment has major prognostic impact and predicts immunotherapy response in solid cancers. EBioMedicine 2023; 88:104452. [PMID: 36724681 PMCID: PMC9918750 DOI: 10.1016/j.ebiom.2023.104452] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 12/21/2022] [Accepted: 01/11/2023] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Cancer immunity is based on the interaction of a multitude of cells in the spatial context of the tumour tissue. Clinically relevant immune signatures are therefore anticipated to fundamentally improve the accuracy in predicting disease progression. METHODS Through a multiplex in situ analysis we evaluated 15 immune cell classes in 1481 tumour samples. Single-cell and bulk RNAseq data sets were used for functional analysis and validation of prognostic and predictive associations. FINDINGS By combining the prognostic information of anti-tumoural CD8+ lymphocytes and tumour supportive CD68+CD163+ macrophages in colorectal cancer we generated a signature of immune activation (SIA). The prognostic impact of SIA was independent of conventional parameters and comparable with the state-of-art immune score. The SIA was also associated with patient survival in oesophageal adenocarcinoma, bladder cancer, lung adenocarcinoma and melanoma, but not in endometrial, ovarian and squamous cell lung carcinoma. We identified CD68+CD163+ macrophages as the major producers of complement C1q, which could serve as a surrogate marker of this macrophage subset. Consequently, the RNA-based version of SIA (ratio of CD8A to C1QA) was predictive for survival in independent RNAseq data sets from these six cancer types. Finally, the CD8A/C1QA mRNA ratio was also predictive for the response to checkpoint inhibitor therapy. INTERPRETATION Our findings extend current concepts to procure prognostic information from the tumour immune microenvironment and provide an immune activation signature with high clinical potential in common human cancer types. FUNDING Swedish Cancer Society, Lions Cancer Foundation, Selanders Foundation, P.O. Zetterling Foundation, U-CAN supported by SRA CancerUU, Uppsala University and Region Uppsala.
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Affiliation(s)
- Artur Mezheyeuski
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Max Backman
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Johanna Mattsson
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Alfonso Martín-Bernabé
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, Karolinska vägen, A2:07, 171 64 Solna, Sweden
| | - Chatarina Larsson
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Ina Hrynchyk
- City Clinical Pathologoanatomic Bureau, Minsk 220116, Republic of Belarus
| | - Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Simon Ström
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Joakim Ekström
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Siarhei Mauchanski
- N.N. Alexandrov National Cancer Centre of Belarus, Lesnoy, Minsk, 223040, Republic of Belarus
| | - Salome Khelashvili
- N.N. Alexandrov National Cancer Centre of Belarus, Lesnoy, Minsk, 223040, Republic of Belarus
| | - Amanda Lindberg
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Margrét Agnarsdóttir
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Per-Henrik Edqvist
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Jutta Huvila
- Department of Pathology, University of Turku, 20500 Åbo, Finland
| | - Ulrika Segersten
- Department of Surgical Sciences, Uppsala University, Akademiska sjukhuset, 751 85 Uppsala, Sweden
| | - Per-Uno Malmström
- Department of Surgical Sciences, Uppsala University, Akademiska sjukhuset, 751 85 Uppsala, Sweden
| | - Johan Botling
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Björn Nodin
- Division of Oncology and Therapeutic Pathology, Department of Clinical Sciences Lund, Lund University, Barngatan 4, 221 85 Lund, Sweden
| | - Charlotta Hedner
- Division of Oncology and Therapeutic Pathology, Department of Clinical Sciences Lund, Lund University, Barngatan 4, 221 85 Lund, Sweden
| | - David Borg
- Division of Oncology and Therapeutic Pathology, Department of Clinical Sciences Lund, Lund University, Barngatan 4, 221 85 Lund, Sweden
| | - Jenny Brändstedt
- Division of Oncology and Therapeutic Pathology, Department of Clinical Sciences Lund, Lund University, Barngatan 4, 221 85 Lund, Sweden
| | - Hanna Sartor
- Diagnostic Radiology, Department of Translational Medicine, Lund University, Skåne University Hospital, Carl-Bertil Laurells gata 9, 20502 Malmö, Sweden
| | - Karin Leandersson
- Cancer Immunology, Department of Translational Medicine, Lund University, J Waldenströms gata 35, 214 28 Malmö, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Anna Portyanko
- N.N. Alexandrov National Cancer Centre of Belarus, Lesnoy, Minsk, 223040, Republic of Belarus
| | - Fredrik Ponten
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Karin Jirström
- Division of Oncology and Therapeutic Pathology, Department of Clinical Sciences Lund, Lund University, Barngatan 4, 221 85 Lund, Sweden
| | - Patrick Micke
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden
| | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, Rudbeck Laboratory, 751 85 Uppsala, Sweden.
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Enblad M, Hammarström K, Folkesson J, Imam I, Golubovik M, Glimelius B. OUP accepted manuscript. BJS Open 2022; 6:6573991. [PMID: 35470381 PMCID: PMC9039122 DOI: 10.1093/bjsopen/zrac039] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 02/10/2022] [Accepted: 02/12/2022] [Indexed: 11/14/2022] Open
Abstract
Purpose Methods Results Conclusion
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Affiliation(s)
- Malin Enblad
- Department of Surgical Sciences, Colorectal Surgery, Uppsala University, Uppsala, Sweden
- Correspondence to: Malin Enblad, Department of Surgical Sciences, Colorectal Surgery, Uppsala University, 751 85 Uppsala, Sweden (e-mail: )
| | - Klara Hammarström
- Department of Immunology, Genetics and Pathology, Experimental and Clinical Oncology, Uppsala University, Uppsala, Sweden
| | - Joakim Folkesson
- Department of Surgical Sciences, Colorectal Surgery, Uppsala University, Uppsala, Sweden
| | - Israa Imam
- Department of Immunology, Genetics and Pathology, Experimental and Clinical Oncology, Uppsala University, Uppsala, Sweden
| | - Milan Golubovik
- Department of Radiology, Uppsala University Hospital, Uppsala, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Experimental and Clinical Oncology, Uppsala University, Uppsala, Sweden
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Mezheyeuski A, Micke P, Martín-Bernabé A, Backman M, Hrynchyk I, Hammarström K, Ström S, Ekström J, Edqvist PH, Sundström M, Ponten F, Leandersson K, Glimelius B, Sjöblom T. The Immune Landscape of Colorectal Cancer. Cancers (Basel) 2021; 13:cancers13215545. [PMID: 34771707 PMCID: PMC8583221 DOI: 10.3390/cancers13215545] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 10/31/2021] [Accepted: 11/02/2021] [Indexed: 12/25/2022] Open
Abstract
Simple Summary We sought to provide a detailed overview of the immune landscape of colorectal cancer in the largest study to date in terms of patient numbers and analyzed immune cell types. We applied a multiplex in situ staining method in combination with an advanced scanning and image analysis pipeline akin to flow cytometry, and analyzed 5968 individual multi-layer images of tissue defining in a total of 39,078,450 cells. We considered the location of immune cells with respect to the stroma, and tumor cell compartment and tumor regions in the central part or the invasive margin. To the best of our knowledge, this study is the first comprehensive spatial description of the immune landscape in colorectal cancer using a large population-based cohort and a multiplex immune cell identification. Abstract While the clinical importance of CD8+ and CD3+ cells in colorectal cancer (CRC) is well established, the impact of other immune cell subsets is less well described. We sought to provide a detailed overview of the immune landscape of CRC in the largest study to date in terms of patient numbers and in situ analyzed immune cell types. Tissue microarrays from 536 patients were stained using multiplexed immunofluorescence panels, and fifteen immune cell subclasses, representing adaptive and innate immunity, were analyzed. Overall, therapy-naïve CRC patients clustered into an ‘inflamed’ and a ‘desert’ group. Most T cell subsets and M2 macrophages were enriched in the right colon (p-values 0.046–0.004), while pDC cells were in the rectum (p = 0.008). Elderly patients had higher infiltration of M2 macrophages (p = 0.024). CD8+ cells were linked to improved survival in colon cancer stages I-III (q = 0.014), while CD4+ cells had the strongest impact on overall survival in metastatic CRC (q = 0.031). Finally, we demonstrated repopulation of the immune infiltrate in rectal tumors post radiation, following an initial radiation-induced depletion. This study provides a detailed analysis of the in situ immune landscape of CRC paving the way for better diagnostics and providing hints to better target the immune microenvironment.
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Affiliation(s)
- Artur Mezheyeuski
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
- Correspondence:
| | - Patrick Micke
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Alfonso Martín-Bernabé
- Department of Oncology-Pathology, Cancer Center Karolinska, Karolinska Institutet, 17164 Stockholm, Sweden;
| | - Max Backman
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Ina Hrynchyk
- City Clinical Pathologoanatomic Bureau, 220116 Minsk, Belarus;
| | - Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Simon Ström
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Joakim Ekström
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Per-Henrik Edqvist
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Magnus Sundström
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Fredrik Ponten
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Karin Leandersson
- Department of Translational Medicine, Lund University, 20502 Malmö, Sweden;
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
| | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, 75185 Uppsala, Sweden; (P.M.); (M.B.); (K.H.); (S.S.); (J.E.); (P.-H.E.); (M.S.); (F.P.); (B.G.); (T.S.)
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Osterman E, Hammarström K, Imam I, Osterlund E, Sjöblom T, Glimelius B. Completeness and accuracy of the registration of recurrences in the Swedish Colorectal Cancer Registry (SCRCR) and an update of recurrence risk in colon cancer. Acta Oncol 2021; 60:842-849. [PMID: 33689551 DOI: 10.1080/0284186x.2021.1896033] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
BACKGROUND The completeness and accuracy of the registration of synchronous metastases and recurrences in the Swedish Colorectal Cancer Registry has not been investigated. Knowing how accurate these parameters are in the registry is a prerequisite to adequately measure the current recurrence risk. METHODS All charts for patients diagnosed with stage I-III colorectal cancer (CRC) in two regions were reviewed. In one of the regions, all registrations of synchronous metastases were similarly investigated. After the database had been corrected, recurrence risk in colon cancer was calculated stratified by risk group as suggested by ESMO in 2020. RESULTS In patients operated upon more than five years ago (N = 1235), there were 20 (1.6%) recurrences not reported. In more recent patients, more recurrences were unreported (4.0%). Few synchronous metastases were wrongly registered (3.6%) and, likewise, few synchronous metastases were not registered (about 1%). The five-year recurrence risk in stage II was 6% for low-risk, 11% for intermediate risk, and 23% for high-risk colon cancer patients. In stage III, it was 25% in low- and 45% in high-risk patients. Incorporation of risk factors in stage III modified the risks substantially even if this is not considered by ESMO. Adjuvant chemotherapy lowered the risk in stage III but not to any relevant extent in stage II. CONCLUSION The registration of recurrences in the registry after 5 years is accurate to between 1 and 2% but less accurate earlier. A small number of unreported recurrences and falsely reported recurrences were discovered in the chart review. The recurrence risk in this validated and updated patient series matches what has been recently reported, except for the risk of recurrence in stage II low risk colon cancers which seem to be even a few percentage points lower (6 vs. 9%).
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Affiliation(s)
- Erik Osterman
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
- Department of Surgery, Region Gävleborg, Gävle Hospital, Gävle, Sweden
| | - Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Israa Imam
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Emerik Osterlund
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
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Imam I, Hammarström K, Sjöblom T, Glimelius B. Neoadjuvant rectal (NAR) score: Value evaluating the efficacy of neoadjuvant therapy and prognostic significance after surgery? Radiother Oncol 2021; 157:70-77. [PMID: 33453311 DOI: 10.1016/j.radonc.2021.01.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 12/24/2020] [Accepted: 01/03/2021] [Indexed: 12/13/2022]
Abstract
INTRODUCTION The Neoadjuvant rectal (NAR) score is a new surrogate endpoint to be used in clinical trials for early determination of treatment response to different preoperative therapies. The aim is to further validate the NAR-score, primarily developed using chemoradiotherapy (CRT) with a delay to surgery 6-8 weeks, and explore its value using other schedules. MATERIALS AND METHODS The study included all 9978 patients diagnosed with non-metastasized RC in 2007-2015 that had undergone surgery and was registered in the Swedish Colorectal Cancer Registry. The patients of interest had either short-course radiotherapy (scRT)/CRT + delayed surgery, long-course radiotherapy (RT) + delayed surgery, (C)RT + additional chemotherapy, primary surgery, or scRT + immediate surgery. The scRT/CRT + delayed surgery groups were further divided based on time to surgery. RESULTS Mean NAR-score differed significantly (p < 0.0001) between different treatments. (C)RT + additional chemotherapy had the lowest mean score of 16.3 and CRT + delayed surgery had 17.7. There was a significant difference (p < 0.05) in overall survival (OS) and time to recurrence (TTR) of patients with a Low NAR-score (<8) compared to those with a High score (>16) for both CRT- and scRT, with a stronger correlation for CRT-patients. C-index for the NAR-score model (0.623) was not superior to when only pathological T- and N-stage was used (0.646). CONCLUSIONS The NAR-score is prognostic, but it is not better than pT- and pN-stage. However, the NAR-score can still discriminate between two treatments that have different cell killing effect and may still be of value in clinical trials as an easier method than pT- and N-stage.
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Affiliation(s)
- Israa Imam
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden.
| | - Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
| | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
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Hammarström K, Glimelius B, Sjöblom T, Mezheyeuski A, Hult NK, Imam I, Ekström J. PD-0538: Rectal cancer: world-wide use of radiotherapy and the importance of more strict lymph node staging. Radiother Oncol 2020. [DOI: 10.1016/s0167-8140(21)00560-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Hammarström K, Imam I, Korsavidou Hult N, Ekström J, Sjöblom T, Glimelius B. Determining the use of preoperative (chemo)radiotherapy in primary rectal cancer according to national and international guidelines. Radiother Oncol 2019; 136:106-112. [PMID: 31015111 DOI: 10.1016/j.radonc.2019.03.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 03/26/2019] [Accepted: 03/31/2019] [Indexed: 01/03/2023]
Abstract
BACKGROUND Pre-operative radiotherapy (RT) or chemoradiotherapy (CRT) is frequently used prior to rectal cancer surgery to improve local control and survival. The treatment is administered according to guidelines, but these recommendations vary significantly between countries. Based on the stage distribution and risk factors of rectal cancers as determined by magnetic resonance imaging (MRI) in an unselected Swedish population, the use of RT/CRT according to 15 selected guidelines is described. MATERIALS AND METHODS Selected guidelines from different countries and regions were applied to a well-characterized unselected population-based material of 686 primary non-metastatic rectal cancers staged by MRI. The fraction of patients assigned to surgery alone or surgery following pre-treatment with (C)RT was determined according to the respective guideline. RT/CRT administered to rectal cancer patients for other reasons, for example, for organ preservation or palliation, was not considered. RESULTS The fraction of patients with a clear recommendation for pre-treatment with (C)RT varied between 38% and 77% according to the different guidelines. In most guidelines, CRT was recommended to all patients who were not operated directly, and, in others, short-course RT was also recommended to patients with intermediate risk tumours. If only non-resectable or difficult to resect tumours were recommended pre-treatment, as stated in many Japanese publications, 9% would receive CRT followed by a delay to surgery. CONCLUSIONS According to most guidelines, well over 50% of primary non-metastatic rectal cancer patients from a general population, in which screening for colorectal cancer is not practised, are recommended treatment with pre-operative/neo-adjuvant therapy.
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Affiliation(s)
- Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden.
| | - Israa Imam
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
| | | | - Joakim Ekström
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
| | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, Sweden
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Hammarström K, Mezheyeuski A, Korsavidou Hult N, Sjöblom T, Glimelius B. Stage distribution utilizing magnetic resonance imaging in an unselected population of primary rectal cancers. Eur J Surg Oncol 2018; 44:1858-1864. [PMID: 30201417 DOI: 10.1016/j.ejso.2018.07.063] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 06/18/2018] [Accepted: 07/23/2018] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Pre-operative radiotherapy (RT) or chemo-radiotherapy (CRT) are sometimes recommended prior to rectal cancer surgery, but guideline recommendations vary. The aim was to describe stage distribution and other important characteristics required for the treatment decision of patients with primary rectal cancers utilizing magnetic resonance imaging (MRI) in an unselected population. PATIENTS AND METHODS All 796 histopathologically verified rectal adenocarcinomas diagnosed 2010-2015 in two counties in Sweden (population 630,000 in 2015) were identified. Staging with pelvic MRI unless contraindications were present, treatment and pathology followed Swedish guidelines. RESULTS Twenty-three % of cases (n = 186) had distant metastases at diagnosis, demonstrating more advanced tumor and nodal stages when compared with non-metastatic patients (p < 0.001), and they more often displayed MRI-identified mucinous features and extramural vascular invasion (EMVI) than non-metastatic tumors (p < 0.001 for both). In non-metastatic patients, 8% displayed clinical stage T1 (cT1), 21% cT2, and 53% cT3; one-third of the latter threatened or involved the mesorectal fascia (MRF+). Almost 20% had stage cT4 (4% cT4a, 14% cT4b) of which 50% were considered "non-resectable". EMVI was seen in 33% of cT3M0 tumors and in 48% of cT4M0 tumors. CONCLUSIONS In an unselected population, approximately 80% of primary rectal cancers are referred to as "locally advanced" (stage II-III, or cT3-4 or N+), meaning that they, according to many international guidelines, are recommended neo-adjuvant treatment. This study provides a detailed description of the clinical stages and presence of characteristics identifiable on MRI which are of importance when assessing the needs for RT/CRT, when using different guidelines.
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Affiliation(s)
- Klara Hammarström
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden.
| | - Artur Mezheyeuski
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | | | - Tobias Sjöblom
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
| | - Bengt Glimelius
- Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
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Abstract
The gene cluster for human U2 RNA has been mapped to chromosome 17q21 by in situ hybridization and hybridization analysis of DNA from mouse/human somatic cell hybrids.
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Abstract
Four loci for human U4 RNA have been characterized by DNA sequence analysis. The results show that all four loci represent pseudogenes, which are flanked by direct repeats. Three of the pseudogenes, designated U4/5, U4/6, and U4/8, have very similar structures; they are all truncated and contain the first 67 to 68 nucleotides of the U4 RNA sequence. Their properties suggest that they were created by integration of truncated cDNA copies of the U4 RNA into new chromosomal sites. An interesting observation was that their flanking regions exhibit sequence homology. A purine-rich 5'-flanking sequence 12 to 13 nucleotides long is almost perfectly conserved in all three loci. Boxes of homology were also found on the 3' side when the U4/6 and U4/8 loci were compared. The U4/4 locus has a slightly different structure; the pseudogene matches the first 79 nucleotides of U4 RNA, but contains a greater number of mutations than the other pseudogenes. Taken together, the results suggest that a frequently occurring type of pseudogene for human U4 was created by a RNA-mediated mechanism and that the integration sites have features in common.
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Hammarström K, Westin G, Bark C, Zabielski J, Petterson U. Genes and pseudogenes for human U2 RNA. Implications for the mechanism of pseudogene formation. J Mol Biol 1984; 179:157-69. [PMID: 6209403 DOI: 10.1016/0022-2836(84)90463-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Three loci, designated U2/4, U2/6 and U2/7, which contain sequences related to human U2 RNA, have been studied. The U2/6 locus contains a tandem array of bona fide U2 genes. U2/4 and U2/7, in contrast, contain pseudogenes of whose sequences deviate significantly from that of mammalian U2 RNA. The two pseudogenes appear to have been created by different mechanisms. The sequences that flank the pseudogene in the U2/4 locus lack homology to the corresponding sequences in functional human U2 genes, except for 10 base-pairs immediately following the 3' end. The conserved 3'-flanking segment is homologous to those nucleotides that are present in a U2 RNA precursor. No direct repeats flank the pseudogene in the U2/4 locus. The observations thus suggest that a complementary DNA copy of the U2 RNA precursor was inserted into a blunt-ended chromosomal break to generate the U2/4 locus. The U2/7 locus, in contrast, revealed flanking sequence homology when compared to functional U2 genes, both on the 5' and 3' sides of the pseudogene. The homology was interrupted on both sides by repetitive sequences belonging to the Alu family. On the 5' side the homology continues beyond the Alu repeats whereas on the 3' side it ends precisely at the Alu repeat. This Alu repeat is inserted in a region where a homocopolymeric region of alternating C and T residues is located in functional U2 loci. The observed organization of the U2/7 locus suggests that a previously functional U2 locus was invaded by Alu repeats and subsequently accumulated base substitutions to become a pseudogene.
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Ofverstedt LG, Hammarström K, Balgobin N, Hjertén S, Pettersson U, Chattopadhyaya J. Rapid and quantitative recovery of DNA fragments from gels by displacement electrophoresis (isotachophoresis). Biochim Biophys Acta 1984; 782:120-6. [PMID: 6722161 DOI: 10.1016/0167-4781(84)90014-9] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The use of displacement electrophoresis (synonymous to isotachophoresis, steady-state stacking, and moving boundary electrophoresis) for recovery of DNA fragments from agarose and polyacrylamide gels is described. Complete recovery of DNA molecules ranging from oligonucleotides to 20 000-basepairs-long fragments was achieved. The DNA is recovered in a small volume (0.1-0.3 ml) and can be used directly in enzyme-mediated cleavage and ligation reactions. The recovered DNA contained no inhibitory contaminants as revealed by ligation or restriction enzyme cleavage.
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Abstract
Genes for the human small nuclear RNA U2 are present within 6.2-kilobase-pair-long tandem repeats. The haploid human genome contains approximately 20 such repeats, organized in one or a few very large clusters.
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Monstein HJ, Hammarström K, Westin G, Zabielski J, Philipson L, Pettersson U. Loci for human U1 RNA: structural and evolutionary implications. J Mol Biol 1983; 167:245-57. [PMID: 6191037 DOI: 10.1016/s0022-2836(83)80334-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Three clones U1-1, U1-6, and U1-8 containing sequences related to human U1 RNA have been studied by sequence analysis. The results show that each of the three clones represents a distinct locus. The U1-6 locus is closely related to the HU1-1 locus, which is believed to represent a functional U1 gene. The U1-1 and U1-8 loci are pseudogenes by definition, since they contain sequences that are closely related to but not identical with the human U1 RNA sequence. The U1-6 locus contains the sequence T-A-T-A-T close to the 5'-end of the U1 sequence but it is unclear if this represents the promoter. When the U1-8 locus was compared to the U1-6 locus, it was observed that the 5'-flanking sequences, except in the immediate vicinity of the pseudogene, are as well-conserved as the U1-related sequence itself, at least up to position -220. The high degree of homology in the 5'-flanking region suggests that U1 genes have a much more strict sequence requirement with regard to 5'-flanking sequences than most other eukaryotic genes. The U1-6 and U1-8 loci contain the sequence T-A-T-G-T-A-G-A-T-G-A between positions -211 and -221. An identical sequence is present in the equivalent position in the HU1-1 locus, and may represent the promoter. The high degree of conservation in the postulated promoter region indicates that pseudogenes like U1-8 possibly could be expressed. A truncated U1-related sequence is present between 106 to 150 nucleotides upstream from the U1 gene/pseudogene in the U1-6, the U1-8 and the HU1-1 loci, suggesting that the U1 genes may have been clustered early in evolution. The U1-1 locus has a strikingly different structure from the U1-8 locus; the pseudogene itself is as closely related to the U1 RNA sequence as is the U1-8 pseudogene but the flanking sequences, both on the 5' and the 3' side, share no detectable homology with the corresponding regions in the U1-6 or U1-8 loci. It may therefore be postulated that small nuclear RNA pseudogenes are created by several different mechanisms.
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Abstract
The human DNA library of Lawn et al. (1978) was screened for sequences complementary to the small nuclear (sn) RNA U4. Several positive clones were identified by screening 100 000 recombinants, indicating that U4 sequences like other snRNA sequences are dispersed in the human genome. One recombinant was characterized in detail by subcloning a Bg/II fragment 1.9 kilobases (kb) long in the pBR322 plasmid. The subcloned fragment was partially sequenced and the results revealed a pseudogene for U4 RNA. The pseudogene was found to have a remarkable structure; it contains a sequence that, except in two positions, matches the first 68 nucleotides of the human U4 RNA sequence and the pseudogene is, moreover, flanked by perfect direct repeats 20 bp long. The results support the model of van Arsdell et al. (1981) suggesting that certain snRNA pseudogenes arise by reverse transcription of the RNA followed by integration of the cDNA copy at a new chromosomal locus.
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Abstract
Pancreatic islets were microdissected from ob/ob mice, loaded for 2 h with 45Ca and perfused with calcium-deficient medium. Irrespective of the glucose and calcium concentrations in the loading medium, increased glucose in the perfusion medium resulted in reduced amounts of radioactivity in the perfusate. A glucose inhibition of 45Ca washout was also evident when the specific radioactivity of the islets approached that of the labeling medium, indicating that the effect was not simply due to isotopic dilution. The depression of 45Ca washout diminished after culture of the islets in a serum-free medium and it was absent in islets taken from mice homozygous for the gene diabetes. The glucose effect became less pronounced when 50 micron D-600, an inhibitor of the calcium inward transport, was added to the calcium-deficient perfusion medium and abolished in the presence of 20 mM Ca-EGTA. The inhibition of the 45Ca washout observed is not necessarily due to a direct glucose interaction with the outward calcium transport but may also result from stimulation of the uptake and intracellular trapping of the cation.
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