China 
Africa 
Japan 
- COVI-VAC
- COVID
- COVID-19
- COVID-19 drug development
- COVID-19 vaccine
- COX-3
- COX5B
- COX6B1
- CP1
- CP2
- CPAP
- CPG oligodeoxynucleotide
- CPG site
- CPHPC
- CPOE
- CPR
- CPSF
- CPT
- CR-39
- CR6261
- CRABP1
- CRABP2
- CRC
- CRE
- CREB
- CREB1
- CRISPR
- CRISPR RNA
- CRISPR associated protein
- CRISPR gene editing
- CRISPR interference
- CRISPR-Cas system
- CRISPR-Cas9
- CRISPR-Cas9 genome editing
- CRM197
- CRO
- CROS hearing aid
- CRT
- CRTC1
- CRTC2
- CSF glucose
- CSR
- CST complex
- CT
- CT angiography
- CT enterography
- CT pulmonary angiogram
- CT scan
- CT urogram
- CTCF
- CTDI
- CTE
- CTEP
- CTGF
- CTL-mediated cytotoxicity
- CTLA-4
- CTP synthase
- CTP synthetase
- CUB domain
- CURB-65
- CUTL1
- CUX1
- CVLT
- CVS
- CX3CL1
- CX3CR1
- CXC chemokine receptors
- CXCL1
- CXCL10
- CXCL11
- CXCL13
- CXCL14
- CXCL16
- CXCL2
- CXCL3
- CXCL5
- CXCL6
- CXCL9
- CXCR2
- CXCR3
- CXCR4
- CXCR4 antagonists
- CXCR5
- CXCR6
- CXCR7
- CYLD
- CYP17A1 inhibitors
- CYP1A2
- CYP1B1
- CYP2A
- CYP2A6
- CYP2B6
- CYP2C19
- CYP2C8
- CYP2C9
- CYP2D6
- CYP2E1
- CYP2R1
- CYP3A
- CYP3A4
- CYP3A7
- CYP4F2
- CYR61
- Cabazitaxel
- Cabbage
- Cabenuva
- Cabergoline
- Cable theory
- Cabotegravir
- Cabozantinib
- Cacao
- Cachexia
- Caco-2
- Cacodyl
- Cacodylic acid
- Cadaverine
- Cadavers
- Cadazolid
- Cadherin
- Cadherin-1
- Cadherins
- Cadmium
- Cadmium nitrate
- Cadmium oxide
- Cadmium poisoning
- Cadmium selenide
- Cadmium sulfide
- Cadmium telluride
- Caecum
- Caesarean delivery on maternal request
- Caesarean section
- Caesium
- Caesium 137
- Caesium-137
- Cafe au lait spot
- Cafergot
- Cafestol
- Caffeic acid
- Caffeic acid phenethyl ester
- Caffeine
- Caffeine citrate
- Caffeine dependence
- Caffeine withdrawal
- Caffeine-induced anxiety disorder
- Caftaric acid
- CagA
- Cajal bodies
- Calamus
- Calbindin
- Calcaneal