The ability to quantify the extent of kidney damage and predict the life remaining in the kidney, using an image obtained at the time when a patient visits the hospital for a kidney biopsy, now is possible using a computer model based on artificial intelligence (AI).
The findings, which appear in the journal Kidney International Reports, can help make predictions at the point-of-care and assist clinical decision-making.
Nephropathology is a specialization that analyzes kidney biopsy images. While large clinical centers in the U.S. might greatly benefit from having ‘in-house’ nephropathologists, this is not the case in most parts of the country or around the world.
According to the researchers, the application of machine-learning frameworks, such as convolutional neural networks (CNN) for object recognition tasks, is proving to be valuable for classification of diseases as well as reliable for the analysis of radiology images including malignancies.
To test the feasibility of applying this technology to the analysis of routinely obtained kidney biopsies, the researchers performed a proof of principle study on kidney biopsy sections with various amounts of kidney fibrosis (also commonly known as scarring of tissue). The machine learning framework based on CNN relied on pixel density of digitized images, while the severity of disease was determined by several clinical laboratory measures and renal survival. CNN model performance then was compared with that of the models generated using the amount of fibrosis reported by a nephropathologist as the sole input, and corresponding lab measures and renal survival as the outputs. For all scenarios, CNN models outperformed the other models.
The researchers believe their model has both diagnostic and prognostic applications and may lead to the development of a software application for diagnosing kidney disease and predicting kidney survival.
Each year, kidney disease kills more people than breast or prostate cancer, and the overall prevalence of chronic kidney disease (CKD) in the general population is approximately 14%. More than 661,000 Americans have kidney failure. Of these, 468,000 individuals are on dialysis, and roughly 193,000 live with a functioning kidney transplant. In 2013, more than 47,000 Americans died from kidney disease. Medicare spending for patients with CKD ages 65 and older exceeded $50 billion in 2013 and represented 20% of all Medicare spending in this age group. Medicare fee-for-service spending for kidney failure beneficiaries rose by 1.6%, from $30.4 billion in 2012 to $30.9 billion in 2013, accounting for 7.1% of the overall Medicare paid claims costs.
