I wanted to know is cancer common with nf type 1?

Rare but does occur: Neurofibromatosis type 1 (NF1) is a hereditary condition commonly associated with multiple café-au-lait spots on the skin. These are light brown in color, and in many instances continue to progress with the conversion to malignant melanoma. Many of the patients develop a number of neurofibromas (benign) They are often seen as raised bumps on the skin. Occassionally one can convert to sarcoma.

Not common: the lifetime risk for cancer neurofibrosarcoma in patients with neurofibromatosis type 1 is 8-13%.. A lot depends on amount of neurofibromas that are present in patient,