Abstract
BACKGROUND
Following surgical and adjuvant treatment of primary colorectal cancer, many patients are routinely followed up with axial imaging (most commonly computerised tomography imaging) and blood carcinoembryonic antigen (a tumour marker) testing. Because fewer than one-fifth of patients will relapse, a large number of patients are followed up unnecessarily.
OBJECTIVES
To determine whether or not the intratumoural immune signature could identify a cohort of patients with a relapse rate so low that follow-up is unnecessary.
DESIGN
An observational study based on a secondary tissue collection of the tumours from participants in the FACS (Follow-up After Colorectal Cancer Surgery) trial.
SETTING AND PARTICIPANTS
Formalin-fixed paraffin-embedded tumour tissue was obtained from 550 out of 1202 participants in the FACS trial. Tissue microarrays were constructed and stained for cluster of differentiation (CD)3+ and CD45RO+ T lymphocytes as well as standard haematoxylin and eosin staining, with a view to manual and, subsequently, automated cell counting.
RESULTS
The tissue microarrays were satisfactorily stained for the two immune markers. Manual cell counting proved possible on the arrays, but manually counting the number of cores for the entire study was found to not be feasible; therefore, an attempt was made to use automatic cell counting. Although it is clear that this approach is workable, there were both hardware and software problems; therefore, reliable data could not be obtained within the time frame of the study.
LIMITATIONS
The main limitations were the inability to use machine counting because of problems with both hardware and software, and the loss of critical scientific staff. Findings from this research indicate that this approach will be able to count intratumoural immune cells in the long term, but whether or not the original aim of the project proved possible is not known.
CONCLUSIONS
The project was not successful in its aim because of the failure to achieve a reliable counting system.
FUTURE WORK
Further work is needed to perfect immune cell machine counting and then complete the objectives of this study that are still relevant.
TRIAL REGISTRATION
Current Controlled Trials ISRCTN41458548.
FUNDING
This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25, No. 2. See the NIHR Journals Library website for further project information.
Plain language summary
Bowel cancer (also known as colorectal cancer) is the fourth commonest cancer in the UK. When the cancer is confined to the bowel and/or the surrounding lymph nodes (early bowel cancer), it is typically treated with an operation to remove the cancer with or without the addition of chemotherapy. Following this treatment, many patients will be cured, but in approximately one in five patients the cancer may come back (recur) either in the bowel or in another organ (e.g. the liver). Consequently, after treatment of early bowel cancer, clinicians often follow up patients in the hope of detecting any recurrent cancer at an early and treatable stage. For the four out of five patients whose cancer will never recur, this follow-up is unnecessary and burdensome on both the NHS and the patients. Better markers are needed to inform which patients do and do not need to undergo this surveillance. Over the last decade, evidence has accumulated to show that the way that a patient's immune system responds to a cancer influences the likelihood of the cancer recurring. It is plausible that those with the most immune cells in their cancer have such a small chance of recurrence that follow-up is not necessary. To validate this in an accurately followed-up population of patients with bowel cancer, we collected cancer tissue specimens from 701 patients in the Follow-up After Colorectal Surgery (FACS) trial and developed methods to count the number of immune cells in their cancers. At present, methods are still under development to automate the process. Indeed, if this were ever to become part of routine practice in NHS laboratories, then automation would be essential.
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