Underdiagnosis, reluctant doctors, patient preconceptions: Treating low testosterone levels is a tricky business in France despite the proven benefits of replacement therapy. About 20% of patients with symptomatic low testosterone levels are treated for the deficiency, said Eric Huygue, MD, PhD, urologic surgeon at Toulouse University Hospital in France, at the 117th annual conference of the French Urology Association (AFU).
, said Dr. Huygue, who was involved in drawing up the first French recommendations on treating low testosterone in 2021.
“We must keep up communication efforts to make patients and doctors aware” of the benefits of supplementation, he said.
Testosterone Levels
Testosterone deficiency mostly affects men older than 40 years. A drop in androgen levels, which varies by individual, can lead to sexual problems (such as erectile dysfunction and low libido), physical symptoms (fatigue, hot flashes, loss of muscle mass, and osteoporosis), and mental disorders (anxiety, irritability, and depression).
There are an estimated 340,000 men with symptomatic testosterone deficiency in France. Just 70,000 of these are receiving replacement therapy (see box), which accounts for only 20% of those affected. For Dr. Huygue, this low treatment rate is due to underdiagnosis, as well as reluctance on the part of doctors and patients.
Although routine screening of low testosterone in the general population is not recommended, some individuals are particularly at risk, noted the urologist.
This is especially true for patients with metabolic disorders associated with insulin resistance (such as obesity and type 2 diabetes), cardiovascular diseases (hypertension, heart failure, and atrial fibrillation), or other chronic conditions (chronic obstructive pulmonary disease, cancer, and depression). Some medications (corticosteroids, antipsychotics, chemotherapy drugs, and antiretroviral therapies) can also lead to low testosterone.
Per the French recommendations for managing low testosterone, diagnosis must be based on free or bioavailable testosterone and not total testosterone levels, which can give a skewed result. Levels must be tested twice, 1 month apart, in the morning and while fasting. The reference range is determined by taking the lower threshold level of young men as measured in the laboratory.
Threshold Values
The current practice of using the reference range associated with the patient’s age group undoubtedly contributes to the underdiagnosis of low testosterone, said Dr. Huygue. According to a survey of AFU members in 2021, the year in which the recommendations were published, 77% of urologists interviewed reported referring to reference ranges for patients of the same age.
In their defense, “this method has long been in use, but it has eventually become apparent that symptomatic patients with an undiagnosed deficiency could be in the reference patients’ group,” Dr. Huygue explained.
Once a deficiency has been diagnosed, doctors may be reluctant to prescribe replacement therapy due to the perceived risk of developing prostate cancer. Several international studies have shown that “the risk of prostate cancer is the single biggest reason for doctors refusing to prescribe testosterone,” said Dr. Huygue.
Despite this reluctance, numerous studies have clearly shown that there is no link between a high testosterone level and the risk of developing prostate cancer. It even seems that a low testosterone level might expose a person to an increased risk for an aggressive form of cancer.
“This is a time of many surprising discoveries concerning the link between the prostate and testosterone, which go against what we have thought up to now. It has been observed that men with low testosterone develop more serious types of cancer,” said Dr. Huygue at a previous meeting of the AFU, during which he announced the publication of the French recommendations.