brain tumor; brain tumour
malignant tumor; malignant tumour
benign tumor; benign tumour
spinal cord tumour; spinal cord neoplasm; spinal tumour
gastrointestinal stromal tumor (tumour); GIST
testicular cancer; testicular tumor (tumour); orchioncus
invasive tumor; invasive tumour
tumor necrosis factor (e.g. cachexin); tumour necrosis factor; TNF
tumor virus; tumour virus