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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Toxicological information

Epidemiological data

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Administrative data

epidemiological data
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: There are no guidelines for cancer epidemiological studies. The study includes all reasonable aspects of such studies and the numbers of subjects and follow up duration are sufficient.

Data source

Reference Type:

Materials and methods

Study type:
cohort study (prospective)
Principles of method if other than guideline:
Prospective mortality study using death notifications of cohort members compared to UK population statistics for mortality and cancer.
GLP compliance:

Test material

Constituent 1
Chemical structure
Reference substance name:
m-tolylidene diisocyanate
EC Number:
EC Name:
m-tolylidene diisocyanate
Cas Number:
Molecular formula:
C9 H6 N2 O2
m-tolylidene diisocyanate
Details on test material:
The epidemiological studies discussed were of workers potentially exposed to MDI and/or TDI. These are generic terms used for commercial products containing various proportions of the MDI or TDI types in REACH registration. The studies reported here are valid for all MDI and TDI types.


Ethical approval:
confirmed and informed consent free of coercion received
Exposure assessment:

Results and discussion

Any other information on results incl. tables

Compared with the general population of England and Wales, mortality from lung cancer in female employees was significantly increased (observed (Obs] 35, expected (Exp) 19.4, standardised mortality ratio (SMR) 181). A similar excess was not found for male employees (Obs 134, Exp 125.0, SMR 107). There were no significantly increased cause specific SMRs among the subcohort (n = 1782) with some period of isocyanate exposed employment. No significant positive trends were found between risks of lung cancer or risks of non-malignant diseases of the respiratory system and durations of "lower" or "higher" exposures to diisocyanates.

Applicant's summary and conclusion

The study has been unable to link isocyanate exposed employment either with risks of lung cancer or with risks of non-malignant diseases of the respiratory system. The increased SMR for female lung cancer is most likely caused by factors unrelated to the industry under study.