Malignant Tumour

Malignant Tumour is a Czech metal band formed in 1991 in Ostrava. The group's lineup has changed many times over the years, with only vocalist and founding member Martin Bílek remaining to this day. The rest of the band consists of bassist Robert Šimek, guitarist Martin Vyorálek, and drummer Petr Bohda. As of 2026, they have released six studio albums, two EPs, and numerous split albums with other musicians.