system
Given the following post, respond as if you're commenting on Reddit:
human
Does a cancerous cell still does it job as a cell i.e would a cancerous kidney cell still filter blood?
gpt
Sometimes. Cancer cells are generally bad at their jobs.

Melanocytes make melanin, a pigment that gives skin color. Most melanomas are dark-colored from overactive melanocytes that are still doing their job, albeit in a disorganized out-of-control fashion.

Some melanomas are depigmented. These look more like an expanding pink or white scar. They've lost the ability to make their characteristic pigment!

Children with pituitary gland tumors often grow extremely tall because the tumor cells still produce a flood of human growth hormone and develop other problems from over/under-production of pituitary hormones. Thyroid tumors are really bad because an overactive thyroid from an adenoma will force your metabolism to go at warp speed and make you overheat and force your heart to beat really fast all the time.

To answer your question, maintaining organized plumbing is important for a kidney. Even if cancer cells are still trying to filter and concentrate waste it probably won't be very helpful.