Cancer risk among women sterilized with transcervical quinacrine hydrochloride pellets, 1977 to 1991.
OBJECTIVE
To determine whether a cluster of eight cancers among 572 women who had received transcervical quinacrine hydrochloride was a random occurrence or evidence of an increased risk of cancer.


METHODS
Retrospective cohort study using interviews and reviews of medical records. Cancer cases were evaluated using cohort analyses and space-time cluster methods.


METHODS
Santiago and Valdivia, Chile.


METHODS
Fourteen hundred ninety-two women who received transcervical quinacrine pellets for sterilization between 1977 and 1989.


METHODS
Age- and site-specific incidence of invasive cancers.


RESULTS
Eight hundred two women were interviewed. From 1 to 14 years of data were available on 600 of the noninterviewed women from clinic records. During 7,852 women-years of follow-up, 17 invasive cancers were identified, compared with 11.8 expected, based on age-specific rates from the Cali, Colombia cancer registry. Five cases of cervical cancer were observed, compared with 3.96 expected. Only one other uterine cancer was observed, a leiomyosarcoma, compared with 0.2 or 0.3 other uterine cancers expected.


CONCLUSIONS
The occurrence of an unusual cluster was confirmed, but no evidence was found of excess cancer risk associated with quinacrine pellet sterilization. However there was a single provocative observation (the leiomyosarcoma), and surveillance of the cohort is continuing.
Sokal
D C
DC
Family Health International, Research Triangle Park, North Carolina 27709, USA.
Zipper
J
J
Guzman-Serani
R
R
Aldrich
T E
TE
D000328:Adult; D016000:Cluster Analysis; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008875:Middle Aged; D009369:Neoplasms / Q000139:chemically induced*; D011796:Quinacrine / Q000009:adverse effects*; D012042:Registries; D012189:Retrospective Studies; D013245:Sterilization, Reproductive / Q000009:adverse effects*; D013997:Time Factors
D011796:Quinacrine