Introduction and Objectives:
Clinical trials are an opportunity for patients to access innovative therapies that are often unavailable in the national healthcare system. The aim of the study is to compare the number of clinical trials in porovincial cities in Poland, with consideration of the fields of medicine. The comparison concerns the total number of clinical experiments with the number of clinical trials per 25,000 residents of the provincial cities.

Material and methods:
The www.clinicaltrials.gov database, a database of clinical trials financed from private and public funds carried out worldwide, was used to analyze the number of clinical trials. Statistical analysis was performed using the software STATISTICA version 13.3.

Results:
Among the provincial cities, the largest number of clinical trials were conducted in Warsaw – 702, followed by Kraków – 576, and Łódź – 487. Considering the number of clinical trials per 25,000 residents of the provincial cities, the largest number of trials without division into therapeutic fields were carried out in Lublin – 28.64, followed by Białystok – 25.73 and Olsztyn – 24.13.

Conclusions:
Taking into account the number of inhabitants of the individual provincial cities and the number of clinical trials conducted in a given city, the results show that the largest number of medical experiments? clinical trials does not always correlate with the largest number of trials per 25,000 residents.