MTC can refer to two different things: medullary thyroid cancer and the Metropolitan Transportation Commission.
Medullary Thyroid Cancer (MTC) is a form of thyroid carcinoma that originates from the parafollicular cells (C cells) of the thyroid gland, which produce the hormone calcitonin. MTC is the third most common of all thyroid cancers and accounts for about 1-3% of all thyroid cancer cases. Approximately 25% of MTC cases are genetic in nature, caused by a mutation in the RET proto-oncogene. MTC can start as a lump in the throat and can spread to other organs such as the lung, liver, bones, and brain. MTC is usually treated by removing the thyroid through surgery, called a thyroidectomy, and sometimes other treatments such as radiation therapy or chemotherapy are required.
The Metropolitan Transportation Commission (MTC) was created by the California Legislature in 1970 to plan, finance, and coordinate the Bay Areas transportation system. The Commissions scope over the years has expanded to address other regional issues, including housing and development. MTC provides planning, funding, coordination, and technical assistance to cities, counties, transit agencies, and other partners to bring the region together and make the Bay Areas transportation system more resilient to future challenges.