Mo. Rev. Stat. § 172.830: Patient discrimination prohibited — payment for services — nonresident treatment.

The state cancer center shall not refuse to provide services to any state resident regardless of race, religion, creed, color, national origin, sex, or ability to pay. The ability of a patient to pay shall be measured by a standard means test and each patient shall be required to pay for services rendered according to his ability. The state cancer center may provide services to nonresidents but may do so only for those persons who agree to pay the charges for such services.