EINECS of Potassium cyanonickelate hydrate (CAS NO.14323-41-2): 238-082-7 
Empirical Formula: C₄H₂K₂N₄NiO
Molecular Weight: 258.9749 g/mol
Boiling Point: 25.7 °C at 760 mmHg
Vapour Pressure: 740 mmHg at 25 °C
Structure of Potassium cyanonickelate hydrate (CAS NO.14323-41-2):
                       
IUPAC Name: Dipotassium nickel(2+) tetracyanide hydrate
Canonical SMILES: [C-]#N.[C-]#N.[C-]#N.[C-]#N.O.[K+].[K+].[Ni+2]
InChI: InChI=1S/4CN.2K.Ni.H2O/c4*1-2;;;;/h;;;;;;;1H2/q4*-1;2*+1;+2;
InChIKey: VQZJEIWYJQFLFX-UHFFFAOYSA-N

Potassium cyanonickelate hydrate (CAS NO.14323-41-2) hasn't been listed as a carcinogen by NTP, IARC, ACGIH, or CA Prop 65. You can see actual entry in RTECS for complete information.

NTP 10th Report on Carcinogens. Nickel and its compounds, as well as cyanide and its compounds, are on the Community Right-To-Know List.

Confirmed human carcinogen. Mutation data reported. Many nickel compounds are poisons. When heated to decomposition Potassium cyanonickelate hydrate (CAS NO.14323-41-2) emits very toxic fumes of CN⁻, K₂O, and NO_x. See also NICKEL COMPOUNDS and CYANIDE.
Hazard Codes: T
Risk Statements: 49-15/29-22-42/43 
R15:Contact with water liberates extremely flammable gases.
R22:Harmful if swallowed. 
R29:Contact with water liberates toxic gas. 
R42/43:May cause sensitization by inhalation and skin contact. 
R49:May cause cancer by inhalation.
Safety Statements: 53-22-36/37-43-45 
S22:Do not breathe dust. 
S36/37:Wear suitable protective clothing and gloves. 
S43:In case of fire use ... (there follows the type of fire-fighting equipment to be used.) 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S53:Avoid exposure - obtain special instructions before use.

OSHA PEL: TWA 0.1 mg (Ni)/m³
ACGIH TLV: TWA 0.2 mg(Ni)/m³; Human Carcinogen)

 Potassium cyanonickelate hydrate , its cas register number is 14323-41-2. It also can be called Nickelate(2-), tetracyano-, dipotassium, hydrate ; and Tetracyanonickelate(2-) dipotassium hydrate . It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Wash mouth out with water, and get medical aid immediately. Notes to physician: Treat supportively and symptomatically.
In addition, Potassium cyanonickelate hydrate (CAS NO.14323-41-2) could be stable and should be exposured to moist air or water. It is not compatible with acids, bases, carbon dioxide. And also prevent it to broken down into hazardous decomposition products: Hydrogen cyanide, carbon monoxide, nickel oxide, oxides of potassium.