The nucleus of cancerous cells becomes

Identify the incorrect statement regarding cancer types.

Assertion $:-$ Metastasis is the most feared property of malignant tumors.
Reason $:-$ Cells sloughed from such tumors reach distant sites through blood and interfere in functions of other tissue.

The diagnosis of cancer is based on which of the following?
$(1)$ Biopsy
$(2)$ Histopathological study of the tissue
$(3)$ Blood test
$(4)$ Bone marrow test

Which technique is used to detect $HIV$ in $AIDS$ patients and to identify mutations in genes of suspected cancer patients?

Which of the following is the most effective technique for the diagnosis of cancer?