IBD-related Malignancies Observed in 2015–2019 : 4 Years’ Results from the Prospective, Nationwide Hungarian Registry IBD-related Malignancies – Hungarian Registry

Introduction: Patients with inflammatory bowel disease (IBD) have an increased risk to develop malignant neoplasms. Neither the exact mechanism, nor the frequency of different malignancies is completely clear. Our aim was to assess the IBD associated malignancies, to collect clinical and mortality data and to analyse possible risk factors. Methods: Data on malignancies developed between January 2015 and May 2019 in Hungarian IBD patients was recorded. Every member of the Hungarian Society of Gastroenterology was prospectively interviewed. The following data were collected: demographic data, disease characteristics, previous therapy, patient adherence, type and localisation of malignancies. Results: 140 IBD patients with newly diagnosed malignancies were reported. 61.4%, 35.7%, and 2.9% of the patients had ulcerative colitis (UC), Crohn’s disease (CD) and indeterminate colitis, respectively. The mean latency was 15.2±10.5 years. Colorectal cancer (CRC) was the most common cancer (49.6%, 70). 72.9% (51/70) of them was associated with UC, more than 80% had extensive (50.9%, 26) and left-sided (31.2%, 16) colitis. The most frequent CRC localisation was the rectosigmoid colon in UC (54.9%), and the rectum in CD (38.9%). The most common non-CRC malignancies were non-melanotic skin-cancer, haematological and pulmonary cancer. Disease duration at the time of the diagnosis of malignancy was lower (17.9±10.7 versus 12.6±9.7 years); mean age at the time of the death was higher (49.3±9.4 versus 64.3±16.4 years); and survival was longer after the diagnosis of extraintestinal malignancy than CRC (0.73±1.01 versus 1.2±0.8). Summary: CRC presented typically in the distal part of the colon by male UC patients with pancolitis or left-sided colitis with a long-standing disease course of IBD. The most common non-CRC malignancies were non-melanotic skin cancer, haematological cancer and lung cancer. Non-CRC malignancies developed typically in female patients, older than CRC patients with shorter disease-course of IBD and longer survival times.