I dont think that you can isolate any gland and say that there is a direct correlation to cancer. IF you think about it, the pineal gland works hand and hand with the hypothalamus and then that affects the pituaitary etc etc and thyroid. So, really it could be just an endocrine issue or dysfunction that affects the cancer cascade. Cancer is so multifactorial but perhaps, if one gland is not working well, it could tip the body in that direction. But then again, why doesnt all people with thryoid dysfunction get cancer. The odds are high but not 100%.