Increasing mortality from cancer of the cervix in young Australian women

Impact of organised cervical screening on cervical cancer incidence and mortality in migrant women in Australia

Background

Organised cervical screening, introduced in 1991, appears to have reduced rates of cervical cancer incidence and mortality in women in Australia. This study aimed to assess whether cervical cancer rates in migrant women in the state of New South Wales (NSW) showed a similar pattern of change to that in Australian-born women after 1991.

Methods

Data from the NSW Central Cancer Registry were obtained for females 15+ years diagnosed with invasive cervical cancer from 1973 to 2008 (N=11,485). We used joinpoint regression to assess annual percent changes (APC) in cervical cancer incidence and mortality before and after the introduction of organised cervical screening in 1991.

Results

APC in incidence fell more rapidly after than before 1991 (p<0.001) amongst women from seven groups defined by country of birth (including Australia). There was only weak evidence that the magnitude of this incidence change varied by country-of-birth (p=0.088). The change in APC in mortality after 1991, however, was heterogeneous by country of birth (p=0.004). For Australian and UK or Ireland-born women the mortality APC fell more rapidly after 1991 than before (p=0.002 and p=0.001 respectively), as it did for New Zealand, Middle East, North Africa and Asian-born (p≥0.05), but in other European-born and women from the ’Rest of the World’ it appeared to rise (p=0.40 and p=0.013 respectively).

Conclusions

Like Australian-born women, most, but not all, groups of migrant women experienced an increased rate of fall in incidence of cervical cancer following introduction of organised cervical screening in 1991. An apparent rise in mortality in women in a ‘Rest of the World’ category might be explained by a recent rise in migration from countries with high cervical cancer incidence and mortality rates.

Cervical cancer in the province of Manitoba: a 30-year experience

OBJECTIVES

This study was undertaken to analyze trends in cervical cancer incidence by histological type and to track the survival rate in the province of Manitoba over a 30-year period.

METHODS

Data from the Manitoba Cancer Registry (MCR) relating to all cases of cervical cancer that occurred between 1970 and 1999 in the province of Manitoba were analyzed to calculate incidence and survival rates according to histological subtype.

RESULTS

Over this 30-year span, invasive cervical cancer was diagnosed in 1927 women, and carcinoma in situ was diagnosed in 10 006 women. Cervical cancer was the fifth most frequent cancer diagnosis for women in 1970, and by 1999 it had become the eleventh most frequent. The incidence rate for cervical cancer decreased from 21.6/100 000 women in 1970 to 8.8/100 000 women in 1999. The mortality rate for women with cervical cancer fell from 7.3/100 000 women in 1970 to 2.8 /100 000 women in 1999. Squamous cell carcinoma (SCC) was the most frequently diagnosed histologic subtype, but its incidence decreased from 1970 to 1999; the proportion of women with adenocarcinoma increased gradually over the same time from 7% to 22%. Survival rates were comparable in women with SCC and adenocarcinoma. In 1999, the incidence of cervical cancer in Manitoba was comparable to the Canadian rate. However, the mortality rate from cervical cancer was higher in Manitoba than in Canada overall.

CONCLUSION

The incidence of cervical cancer and the incidence of cervical cancer-related deaths in Manitoba both dropped between 1970 and 1999. However, the incidence of cervical carcinoma in situ has increased steadily during the same period. These observations may reflect the effect of screening programs on the detection and treatment of cervical cancer precursors. Squamous cell carcinoma is still the most frequently diagnosed subtype of invasive cervical cancer, but the proportion of women with adenocarcinoma has increased. Deaths from cervical cancer showed a non-significant reduction over the study period.

Cervical cytology specimen adequacy: patient management guidelines and optimizing specimen collection

OBJECTIVE

To provide updated management guidelines according to cervical cytology specimen adequacy and techniques to optimize adequacy based on literature review and expert opinion.

MATERIALS AND METHODS

Selected members of the American Society for Colposcopy and Cervical Pathology committee and invited experts conducted a literature review and discussed appropriate management and areas for future research emphasis.

RESULTS

The guidelines recommend a repeat Pap test in a short interval of 2 to 4 months for most women when the cytology result is unsatisfactory. The preferred follow-up for women with a negative cytology result lacking an endocervical/transformation zone component or showing other quality indicators is a repeat Pap test in 12 months. Indications for an early repeat Pap test in 6 months are provided, and the influence of human papillomavirus testing results on management is discussed. Techniques for optimizing specimen adequacy are provided in detail.

CONCLUSION

The specimen adequacy management guidelines will help promote uniform and optimal follow-up of patients receiving cervical cytology screening. The topics for future research emphasis will be helpful in promoting studies in needed areas.

Decreasing incidence of cervical adenocarcinoma in Ontario: Is this related to improved endocervical Pap test sampling?

In many developed countries, the incidence of cervical cancer has decreased. These reductions have been specific to squamous cell carcinoma (SCC) and have not included adenocarcinoma (AC). Incidence of AC has increased steadily over the last 20 years. The intent of this article is to examine trends in cervical adenocarcinoma incidence in Ontario over a 20-year period in relation to screening practices. All cases of cervical cancer between 1981 and 2002 were extracted from the Ontario Cancer Registry (a population-based, provincial-wide database). Age-standardized incidence rates were calculated overall, by broad age groups and by morphological type (SCC and AC). Time trends were assessed using JoinPoint methodology. In Ontario, opportunistic cervical cancer screening has been accompanied by significantly decreased rates of SCC since at least 1981. Conversely, the incidence of AC rose by 3.1% per year (95% CI: 1.6%, 4.6%) between 1981 and 1995, and subsequently declined by 4.0% per year (95% CI: -7.4%, -0.5%). From the mid- to late-1990s, instructions were distributed to clinicians, reinforcing the importance of dual specimen collection (i.e., using both spatula and endocervical brush). At the same time, laboratories routinely provided physicians with kits that included both spatula and brush. The subsequent decline in AC incidence may be due, in part, to improved specimen collection. As well, the decline may be partly due to increased awareness of AC precursors among cytopathologists and clinicians, and/or improvements in laboratory training and quality assurance.

Systemic therapy for gynecological neoplasms: ovary, cervix and endometrium

Early-stage endometrial carcinomas should be treated by total abdominal hysterectomy and bilateral salpingo-oophorectomy. In a small subset of patients, who wish to have children, conservative treatment (hormonal therapy) could be considered. The most effective agents for palliation of advanced disease are doxorubicin plus cisplatin.

Trend of cervical cancer mortality in Belgium (1954-1994): tentative solution for the certification problem of unspecified uterine cancer

We investigated the evolution of mortality from cervical cancer in Belgium between 1954 and 1994 in terms of absolute number of deaths, and standardised and age-specific mortality rates. Changes over generations were summarised using the standardised cohort mortality ratio. Trend studies of cervical cancer mortality were hampered by certification problems. The number of deaths due to cancer of the uterine cervix is not known exactly since a substantial proportion of death causes are coded as cancer of the uterus without specifying the anatomic site: cervix or corpus uteri. This inaccuracy in codification has been corrected using distribution tables derived from countries where this certification problem is minimal. Trends in mortality from certified and corrected cervical cancers were compared. The corrected age-standardised mortality rate decreased continuously over the last 4 decades, from over 14 to 5 per 100,000 woman-years (slope -0.26/100,000 woman-years, 95% CI -0.28 to -0.24). Its slope is 3.1 times (95% CI 2.9-3.5) more important than for the rate of mortality from certified cervical cancer. In addition to the almost linear decrease, substantial nonlinear cohort influences were observed in certified and corrected mortality rates. The tendency of increasing mortality in women born after 1935 required particular attention. Nevertheless, the slope of the corrected recent cohort effect remained limited in Belgium, probably as a consequence of screening.

Cervical cancer in Canada: changing patterns in incidence and mortality

Data on incidence of cervical cancer by histologic subtype and mortality for the Canadian provinces of Ontario, Saskatchewan, and British Columbia were used to examine time trends by age, calender period, and birth cohort. Age-adjusted incidence rate of squamous cell carcinoma of the cervix decreased from 11.1 per 100,000 women in 1970-72 to 5.3 in 1994-96, while the rate for cervical adenocarcinoma increased from 1.1 per 100,000 women to 1.5 over the same period. Age-adjusted mortality rate declined from 7.9 per 100,000 women in 1953-55 to 1.9 in 1995-97. The patterns in age-specific mortality rates in 1953-72 were different from those in 1973-97; younger women experienced larger reductions in mortality during the earlier period while older women benefited to a greater extent during the latter period. Age-period-cohort modeling showed that cohort effects were responsible for the decreasing trends in incidence of squamous cell carcinoma of the cervix and increasing trends in adenocarcinoma, and both period and cohort effects account for the observed trends in mortality. The results suggest that Pap smear screening has played a significant role in the reduction in squamous cell cervical carcinoma. The causes for the increase in cervical adenocarcinoma are unclear.

Early invasive (FIGO stage IA) carcinoma of the cervix: a clinico-pathologic study of 476 cases

The clinical and histologic features of 476 tumors fitting the 1995 FIGO definition of stage IA cervical cancer, treated at a Sydney tertiary referral hospital between 1953 and 1992, are reviewed. Five-year follow-up was complete with a median of 10 years. The diagnosis was increasingly made by histologic examination of colposcopically directed cone biopsy. The majority (88%) of tumors were squamous. The proportion of both younger women (</=35 years) and adenocarcinoma and adenosquamous tumors increased during the second half of the study. Nearly half invaded 1 mm; a third 1.1-3 mm and 20% 3.1-5 mm. Lymph vascular space invasion (LVSI) increased with increasing depth of invasion and was present in over half the tumors invading >3 mm. Treatment was surgical in 99% and was increasingly more conservative as the study progressed with no apparent increase in treatment failure. From 1973 treatment by cone biopsy rose from 6.5 to 35%, by radical hysterectomy fell from 51 to 21% and by lymphadenectomy from 53 to 26%. Only one of 115 patients treated by cone biopsy died. Positive lymph nodes were detected in 1.7% of 180 patients undergoing lymphadenectomy. There were 16 recurrences (3.4%); six vaginal with no cancer deaths, nine pelvic and one distant, with nine deaths and three new cancers (two deaths). Univariate analysis suggests that older age, glandular tumors and those invading 3 mm were associated with more treatment failures and multivariate analysis showed that both conservative hysterectomy and the omission of lymphadenectomy are associated with higher recurrence rates with >3 mm invasion. The study failed to resolve the dilemma of predicting those tumors with a poor prognosis.

Trends in cancer of the cervix uteri in Sweden following cytological screening

Trends in cervical cancer incidence following the introduction of screening have mostly been studied using cross-sectional data and not analysed separately for squamous cell cancer and adenocarcinomas. Using Swedish nationwide data on incidence and mortality, we analysed trends during more than 3 decades and fitted Poisson-based age-period-cohort models, and also investigated whether screening has reduced the incidence of adenocarcinomas of the cervix. The incidence of reported cancer in situ increased rapidly during 1958-1967. Incidence rates of squamous cell cancer, fairly stable before 1968, decreased thereafter by 4-6% yearly in women aged 40-64, with a much smaller magnitude in younger and older women. An age-cohort model indicated a stable 70-75% reduction in incidence for women born 1940 and later compared with those born around 1923. The incidence of adenocarcinomas doubled during the 35-year study period. The mortality rate increased by 3.6% before 1968 and decreased by 4.0% yearly thereafter. Although a combination of organized and opportunistic screening can reduce the incidence of squamous cell cancer substantially, the incidence of adenocarcinomas appears uninfluenced by screening.

Cervical cancer mortality in Belgium, 1955-1989. A descriptive study

This study describes trends in cervical cancer mortality among women in Belgium from 1954 to 1989. Data are analysed by means of the standardised mortality rate, age- and cohort-specific mortality rates and standardised cohort mortality ratios. The age-standardised mortality rate decreased progressively from 6.3/100,000 women-years in the first period (1955-1959) to 3.8/100,000 in 1985-1989, indicating a decline of 39.7% over the seven quinquennial periods. A decrease was observed in almost all age groups between 30 and 69 years. In the last 15 years, no further decline, but even a discrete increase, occurred for the age categories younger than 50 years. The successive cohorts born between 1915 and 1939 expressed a continuing lower risk of cervical cancer mortality. This trend was not observed for the most recent generations, for whom even a slight increase of the standardised cohort mortality ratio could be distinguished.

Is cervical screening working? A cytopathologist's view from the United Kingdom

This article considers the NHS cervical screening program and the controversies which have attended the introduction of comprehensive screening in a partially screened population of women in whom the underlying risk of disease was unknown. The increase in screening coverage which has taken place since 1988 has coincided with a period of high prevalence of cervical cancer and its precursors among women in the screening age group, against which background the recent fall in mortality and incidence of the disease has been a far greater achievement than generally recognized. The success of the program is considered in the context of the expectations and limitations of the test itself, and the high standards required for screening to be effective.

Some characteristics of the glutathione cycle revealed by ionising and non-ionising electromagnetic radiation

The cyclic reaction of GSH-->GSSG-->GSH (designated R(exp) or R(e)) obeys the three specific features of life by producing energy in exponential quantities relative to time, is in effect irreversible and is inherited from generation to generation. In multicellular life, this reaction produces the energy for mitosis and is kept in controlled inactivity until needed to maintain perfection of form and function by energising mitosis. The immediate control of Re appears to be feedback process-dependent on the concentration of GSSG. Ultra high-frequency electromagnetic radiation of 434 MHz (UHF) will change Re from inactive to active and, in so doing, it causes resonance and/or fluorescence of the glutathione cycle which changes its radiosensitivity. Re is the primary direct target of ionising radiation and produces the energy for mitosis. Clinical observations suggest that, in the normal cell, Re is inactive and is not killed by 3 x 2700 rads or 6 x 1650 rads yet, when active, its sensitivity value (DO) is approximately 160 rads. Using the standard radiobiological equation of response to ionising radiation, it can be deduced that radiosensitive cancers have two or three Re units active per cell and radioresistance increases in proportion to the number of potentially active Re units per cell. Re appears to be the main cause of cancers' increased conductivity of electricity compared with normal tissue. In cancer therapy, UHF is the best radiosensitiser ever discovered (up to two or more decades). Re is also intelligent compared with non-exponential reactions but cannot be the basis of intellectual brain functions which must be based on non-electrical chemical processes.

Epidemiology of cervical intraepithelial neoplasia: the role of human papillomavirus

The evidence implicating specific HPV types in the aetiology of cervical cancer is now strong enough to establish a causative role. HPV infection of the cervix affects the developing immature metaplastic cells of the transformation zone. Cervical neoplasia can be viewed as the interaction of high risk papillomavirus and immature metaplastic epithelium. Once maturity is reached, there is minimal risk of subsequent development of cervical squamous neoplasia. Exposure to HPV is an extremely common event, especially in young sexually active women. Yet, despite frequent HPV exposure at that phase of life in which the cervical transformation zone is at its most vulnerable, established expressed disease is relatively uncommon. Most studies in which the natural history of CIN is not altered by cervical biopsy reveal a progression rate from low to high grade CIN of less than one third. Where viral type is taken into account, however, the progression rate from normal but high risk HPV-infected cervical epithelium to CIN 2 or 3 is higher. Despite this, most cervical abnormalities will not transform into invasive cancer, even if left untreated. The variance between the high rate of HPV infection, the intermediate rate of CIN and the relatively low rate of cervical cancer establishes a stepwise gradient of disease of increasing severity with decreasing prevalence. In an immunocompetent host, HPV infection alone does not appear to be sufficient to induce the step from high grade CIN to invasion. Epidemiological studies indicating that HPV infection with oncogenic viral types is far more common than cervical neoplasia suggest the necessity of cofactors in cervical carcinogenesis. The long time-lag between initial infection and eventual malignant conversion suggests that random events may be necessary for such conversion, and the spontaneous regression of many primary lesions suggests that most patients are not exposed to these random events. Potential cofactors include cigarette smoking, hormonal effects of oral contraceptives and pregnancy, dietary deficiencies, immunosuppression and chronic inflammation. In those women who develop cervical cancer, malignant progression is rarely rapid, more commonly taking many years or decades. Malignant progression has been documented in patients who presented initially with only low grade HPV-induced atypia. On the other hand, progression may be a misnomer, as 'apparent' progression may really represent adjacent 'de novo' development of higher grade CIN. Although most cervical cancers contain high risk HPV types, up to 15% of such cancers test negative for HPV, raising the possibility that a few, usually more aggressive, cervical cancers may arise from from a non-viral source.(ABSTRACT TRUNCATED AT 400 WORDS)

Incidence, mortality and survival from invasive cervical cancer in Vaud, Switzerland, 1974-1991

BACKGROUND

Several factors have contributed to the substantial decline in mortality from cervical cancer registered in most areas of the world, i.e., improved sexual hygiene, changes in reproductive factors, cervical screening, and, possibly, improved treatment. Each of these components is evaluated through a systematic inspection of trends in incidence, mortality and survival rates registered for a well-defined population.

PATIENTS AND METHODS

Trends in incidence, mortality and survival from invasive cervical cancer over the period 1974-1991 were analysed for three separate age groups (< 55, 55-64, > or = 65 years), histological type and stage using data from the Cancer Registry of the Swiss Canton of Vaud.

RESULTS

Below age 55, the age-standardized (world standard) incidence rate was 9.3/100,000 women in 1974-76, it declined steadily thereafter down to 2.9 in 1986-88, but increased to 4.3 in 1989-91. In the age group 55-64, cervical cancer incidence remained around 40/100,000 to the end of the 1970s, but thereafter declined to 10.9 in 1989-91. No consistent trend was observed in elderly women, and the rate in 1989-91 (26.7/100,000) was similar to that in 1974-76 (33.7). The overall age-standardized cervical cancer incidence declined from 13.5/100,000 in 1974-76 to 5.8 in 1986-88, but rose to 6.4 in 1989-91. A similar pattern was observed for mortality, with a fall in rates in younger women between 1974 and 1985 (from 2.1 to 0.6/100,000), and a subsequent rise to 1.1/100,000 in 1989-91. A substantial decline in mortality was observed in women aged 55 to 64 since the early 1980's, from 17.2 in 1980-82 to 3.3 in 1989-91. No clear mortality trend was evident in older women. Overall, cervical cancer mortality declined from 4.3/100,000 in 1974-76 to 2.3 in 1989-91. The five-year relative survival rates were around 0.70-0.75 for younger women, around 0.60 for those aged 55 to 64, and 0.50 for elderly ones. In a Cox proportional hazard model, age and clinical stage were significantly related to survival, but not histological type and calendar period of diagnosis. No substantial change in survival from invasive cervical cancer was observed over the 18-year period considered, nor was there any notable change in the stage distribution over time. The proportion of adenocarcinomas, however, appears to have increased in the most recent calendar period.

CONCLUSIONS

These data reflect the impact of screening on cervical cancer rates, which, however, appeared restricted to women below age 65. An upward trend in cervical cancer incidence and mortality rates for younger women was also apparent, and there was no indication from these data of an improved survival for invasive cervical cancer patients over the last two decades. Extention of screening to elderly women appears to be a priority for reducing cervical cancer rates in this population.

Cervical carcinoma in young patients: clinical and pathological variables

Twenty-five (10.2%) out of 243 untreated patients with invasive cervical carcinoma were 35 years old or younger. When matching the clinical and pathological variables between the younger and the older women, the former were characterized by a higher rate of Stage IB disease (P = 0.10), G3 and G4 tumors (P = 0.25), bulky lesions (P = 0.05) and node metastases (P = 0.50). In spite of this poorer pathological profile, both the 5-year disease-free survival rate (75%) and survival according to stage of the younger women were similar to those reported in larger series, regardless of the patients' age. No modification of the standard therapy is therefore required in younger patients.

Abnormal cervical cytology in adolescents: a literature review

This article reviews the literature on the subject of cervical cytological abnormalities in teenagers, defined as a Papanicolaou (Pap) smear result more severe than inflammation. There is discussion of the increasing prevalence of this problem in adolescents. Behavioral and biologic risk factors are examined. The role of the human papillomavirus, widely believed to be the etiologic agent, is addressed. Atypia, its relationship to cervical malignancies, and its management are reviewed. The possible role of the human immunodeficiency virus in the increasing prevalence of cytological abnormalities in teens is considered.

Cervical cancer--what role for human papillomavirus?

OBJECTIVE

To review the role of human papillomavirus (HPV) as a causative agent of cancer of the cervix. DATA SOURCES, data synthesis, study selection: Medical journals, recently published text books related to cancer of the cervix and HPV and Papillomavirus Reports were examined to review the pathology of cervical cancer and its precursor lesions, its epidemiology in Australia and overseas, methods of detection of HPV (in particular molecular biology techniques used to diagnose HPV) and evidence linking HPV with genital neoplasia.

CONCLUSION

While there is compelling evidence strongly linking certain HPV types with genital cancer, a causative role is yet to be proven and the aetiology is most likely multifactorial. Detection and typing of high risk genotypes of HPV in the genital tract as a diagnostic exercise to identify those women most at risk of developing genital neoplasia is not currently recommended.

Cancer of the cervix--old and young, now and then

A study of two 5-year periods, 1960-1964 and 1982-1986, in Queensland is made. Changing patterns of preinvasive and invasive cervical carcinoma in the world literature are discussed. The age of presentation, stage, histology, and results in Queensland for cervical carcinoma are analyzed. There are over 500 patients in each quinquennium. While the total female population has increased 86%, the maximum increase is in patients under 35 years and over 65. There has been a 50% decrease in the incidence of cervical carcinoma, but a doubling under the age of 30. The stage at diagnosis has markedly improved with 88% stage Ib in the young as opposed to 50% formerly. Late-stage disease remains a problem of the aged. The mortality in both time spans increases with age. Histologic patterns show an increase in nonsquamous patterns and increased mortality in the rare patterns. We have no evidence of the emergence of a rapidly progressive carcinoma in the young. Papanicolaou smear and education programs appear to be preventing cervical carcinoma and allowing diagnosis of the disease at an earlier stage and age. This is reflected in a decrease in mortality from 9.6 per 100,000 (1960-1964) to 4 per 100,000 (1982-1986).

Uterine cervical punch biopsy specimens can be analyzed by 1H MRS

Biopsy specimens of the uterine cervix, including colposcopically directed punch biopsy specimens of females with atypical Papanicolaou smear tests, are suitable for analysis by magnetic resonance (MR) spectroscopy. A narrow lined lipid MR spectrum, characteristic of malignant tissue, is obtained from a 6-mm3 biopsy specimen of histologically confirmed squamous carcinoma of the cervix. In contrast, specimens containing inflammatory cells generate a broad component only centered at 1.3 ppm with a T2 relaxation value of less than 350 ms. Most biopsy specimens which contain dysplastic cells or evidence of human papilloma virus (HPV) infection have a discernible lipid spectrum similar to that of the malignant tissue specimen. Long T2 relaxation values found in malignant tissue specimens at 1.3 and 1.2 ppm are observed in some but not all of the biopsies which show evidence of HPV infection. The suitability of small tissue samples, such as punch biopsy specimens, for study by MR illustrates the sensitivity of this technique and its potential as an aid to histopathological discrimination between the various precursor states of cervical cancer.

Recent trends in cervix uteri cancer

Since the prevalence of several risk factors for cervix uteri cancer, such as sexual activity patterns, cigarette smoking, and contraceptive use, has changed over time, the authors analyzed US trends for this cancer during the 1970s to 1980s to search for corresponding variations. Invasive cervical cancer incidence and mortality rates continued to decrease among blacks and whites, although declines are moderating or plateauing among young whites. Carcinoma in situ rates have not changed greatly or have declined, more so among blacks than whites. Excess risks among blacks are less evident among younger than older age groups. Increasing trends were seen only among whites in certain age groups or with certain histologic types. Declining trends in cervical cancer appear related to the widespread use of cervical cytologic screening programs, which have counteracted increases anticipated from changes in risk factor prevalence. Continued surveillance is warranted, however, with special attention to the trends in cervical adenocarcinoma.

Cervical cancer in South Australia: trends in incidence, mortality and case survival

Approximately 90% of cervical cancers are considered preventable through regular screening and the treatment of precursor lesions, but fewer than 20% of South Australian women were found to have been screened in 1984. Data from the State Cancer Registry have shown an increase in cervical cancer incidence of approximately 80% in women under 50 years of age in the 9-year period to 1986, but a decrease of about 25% in older women. Mortality data have shown similar patterns by age, although the increase in younger women tended to extend to an older age. Case survival was unchanged between the diagnostic periods 1977-1981 and 1982-1987 and there was little change in the proportion of cases that were adenocarcinomas.

Incidence of invasive cervical cancer in the Swiss canton of Vaud, and a note on screening

Age adjusted incidence rates (World standard) from invasive cervical cancer in the Swiss canton of Vaud decreased from 17.7/100,000 in 1968-70 to 9.9/100,000 in 1983-85. The decline was substantial in younger middle age, but no appreciable trend was observed in women over 70. This is consistent with available interview based information on the pattern of cervical screening in the Swiss population. Although there was no organised screening programme in Switzerland, over 80% of women aged 20-44 and 65% of those aged 45-64 reported one or more screening smears over the previous 3 years, compared to only 22% of women aged 65 or over. In the last calendar period, there was an apparent increase in the incidence of invasive cervical cancer (from 2.5 to 6.1/100,000) in women aged 25-29. Although based on small absolute numbers, this is in agreement with incidence and mortality data from other countries, and may therefore confirm a change in risk factor exposure in younger women.

Sexual, reproductive and contraceptive risk factors for carcinoma-in-situ of the uterine cervix in Sydney

Sexual, reproductive and contraceptive risk factors were investigated in a matched community-based case-control study of carcinoma-in-situ of the uterine cervix in Sydney. The risk was related strongly to the number of sexual partners: women who had had seven or more sexual partners in a lifetime had a six-fold increased risk compared with those with one or no partner. Early age at first sexual intercourse was also a risk factor, but this effect was reduced substantially after adjustment for the number of partners, with only a two-fold excess risk persisting for those with first intercourse before the age of 16 years as compared with those whose first sexual intercourse was at the age of 25 years or later. The long-term use of oral contraceptive agents was associated with an elevated risk (relative risk, 2.3 for more than six years of use); this effect was maintained for both oestrogen and progestogen doses. The risk increased with the number of induced abortions that had been undergone (relative risk, 2.2 for two or more abortions), but this effect was not statistically significant. A protective effect was found for women who had had a tubal ligation, for those who practised the rhythm method of birth control, and for women who breastfed. It is possible that these reduced risks may relate to unmeasured variables of life-style.

Invasive carcinoma of the cervix in young women

One hundred and seventy-six cases of cancer of the cervix in women age 35 years or less from 1959 to 1980 were compared with 65 cases occurring in the 5-year period from 1982 to 1986. The incidence of the disease in this age group changed little over this time, increasing from 9% to 11%. However, the incidence of adenocarcinoma cell types increased from 10% in the first period to 25% in the more recent cases. A change in management resulted in increased surgical emphasis in treatment; only 24% were treated surgically in the earlier group compared to 80% in the recent group. There has not been an increase in advanced cases or mortality in those young patients in recent years.

The increasing problem in Tayside of cervical cancer in younger women

The incidence of cervical carcinoma in younger women is increasing in Tayside despite a decrease in the overall incidence. However, stage for stage, we did not encounter a poorer survival in younger patients. A number of patients had been sterilised or had a pregnancy when cytological screening was available and not made use of. There were also some false negative smears which were reclassified for retrospective analysis. We would recommend cervical screening every three years and careful inspection of the cervix and a smear taken in cases of abnormal gynaecological symptoms such as post coital bleeding.

Human papillomaviruses and carcinomas

The recognition of multiple types of human papillomaviruses has resulted in remarkable progress in the detection of persisting viral nucleic acid sequences in carcinomas. The consistent transcription in tumors of two early open reading frames, E6 and E7, with few exceptions (Lehn et al., 1985), indicates a role for the products of these genes in the induction and/or maintenance of the transformed state. A number of studies have shown that in vitro transformation can be achieved by transfection of E6/E7 DNA, and proteins encoded by these DNA sequences can be demonstrated in primary human keratinocytes immortalized by this DNA (Kaur et al., 1989). Mutagenesis experiments are needed to determine the absolute requirement for and function of these genes in transformation. A preferential association of some types with benign lesions while others may be frequently found in malignant tumors has been observed. HPV types 5 and 8 in epidermodysplasia verruciformis patients and types 16, 18, 31, 33, etc. in genital lesions are most frequently associated with progression to malignancy, whereas other types, such as HPV-6,-10, -11, and -20, are regularly identified in benign warts. Such distinctions are not absolute but provide the initial steps toward establishing a causal role for some human papillomaviruses in carcinomas. The need for well-designed epidemiological studies in concert with optimum molecular and serologic evaluations is evident (Armstrong et al., 1988). The data from human and animal studies indicate that papillomaviruses contribute significantly to the development of many, if not all, carcinomas, but we do not yet have a clear understanding of the importance of other interacting viral, chemical, or cellular factors. The application of gene cloning and non-stringent hybridization (Law et al., 1979) has provided us with an apparently ever-increasing catalog of human papillomaviruses. More effort is now required to establish their prevalence, the natural history of infection, and the mechanism of neoplastic transformation.

Human papillomavirus: the untreated male reservoir

Human papillomavirus infection currently is accepted as a major factor in the etiology of carcinoma of the cervix, vagina and vulva. While the nature of genital human papillomavirus infection in women is well documented, detailed knowledge of the disease in the male partners is lacking. Therefore, a prospective study was done to define the disease in the genitals of heterosexual men and to formulate an appropriate plan of management. We studied 52 men during an 8-month period for evidence of genital human papillomavirus infection. The majority of the lesions occurred on the shaft of the penis and on the foreskin of uncircumcised men. Deoxyribonucleic acid dot hybridization of biopsies of macroscopic warts and suspected warty lesions with mixed human papillomavirus types 6 and/or 11 and 16 and/or 18 probes revealed that 87 and 55 per cent, respectively, were positive for 1 or more of these human papillomavirus types. Of the macroscopic warts and subclinical lesions 52 and 29 per cent, respectively, contained the more potentially oncogenic types 16 and/or 18, either alone or in combination with types 6 and/or 11. There was no evidence of human papillomavirus in any semen or urine sample but human papillomavirus deoxyribonucleic acid sequences were detected in 31 per cent of the biopsies from apparently normal penile skin and in 18 per cent of the urethral mucosal biopsies. We suggest that management of human papillomavirus infection be directed toward prevention and contact screening, together with ablation of localized lesions.

Frequency of cervical smear-tests among patients of general practitioners

Eight hundred and thirty-eight women who attended 36 general practitioners were asked when they had last undergone a cervical smear-test. Only 6% of women who were between 25 and 54 years of age had never undergone a smear-test, but in women who were younger and older than this age range the proportion was one-third. We estimated from this pattern of use of cervical smear-tests that only 60% of invasive cervical cancer is being prevented, and the major contribution to the remaining risk factors comes from women of over 55 years of age who either have not undergone a smear-test or had undergone one a long time previously. This information suggests that general practitioners and the public-health system should be more active in ensuring that all at-risk women undergo cervical smear-tests.

Decreasing incidence of invasive cervical cancer in young women

Although the overall incidence of invasive cervical cancer is decreasing, there is concern that the disease might be increasing in younger women. Analysis of data from the Cancer Surveillance System, a population-based cancer registry in western Washington, shows a decreasing incidence of cervical cancer in women of all ages.

The Pap smear revisited

Papanicolaou smear screening for cervical cancer has become an established practice in most developed countries. This is because the cervix is relatively accessible to investigation and treatment, and early stages in the morphogenesis of cervical cancer are both recognizable and easily treated. The Pap smear is a valid test. It is simple, relatively inexpensive, reliable, and free of risk. Although the test has far from perfect sensitivity, it has high specificity, and false-positive results are rare. In most reported series, the majority of false-negative results have been found to be attributable to collection errors rather than laboratory errors. Despite the importance of Pap smear screening, controlled prospective trials have not been undertaken to determine its efficiency in reducing cervical cancer incidence and mortality. However, countries with well-organized programmes, wide population coverage and correct follow-up appear to have had some impact on mortality from cervical cancer. Nevertheless, coverage of high-risk groups, particularly women over 40 years of age, remains the greatest problem. Recommendations on the frequency of testing vary considerably. Statistical models indicate triennial testing may deliver almost all of the effectiveness of annual testing at a substantially reduced cost, but the numerous reports of false-negative results argue strongly in favour of annual screening. It is possible that these problems may be solved in the future by increasing the sensitivity of the test and/or by the use of additional tests.

Cervical cancer mortality trends in Australia--an update

Trends in the mortality rate due to cancer of the cervix in Australian women were reviewed for the period 1950-1984, taking into account the changes in the proportion of women who have undergone a hysterectomy. Cohort-based increases in women who were born after 1935, which had been reported previously, were observed to extend into the 40 to 44 years' age group and to continue the upward trend in women aged 30-39 years. However, for women who were less than 30 years of age there was evidence of a recent fall in the rate of cervical cancer mortality.

Time trends in prevalence of cervical cytological abnormality in women attending a sexually transmitted diseases clinic and their relationship to trends in sexual activity and specific infections

Trends in prevalence of cytological evidence of cervical intraepithelial neoplasia (CIN) and cervical infection with human papilloma virus (HPV), as indicated by HPV infection and dyskeratosis, were studied in 2,992 new attenders at a sexually transmitted diseases (STD) clinic between 1978 and 1982. Crude prevalence of CIN increased from 1.3% to 4.3% (P less than 0.001) and crude prevalence of HPV infection increased from 2.8% to 9.3% (P less than 0.001). Age adjustment had little effect on these trends. Review, in 1984-85, of samples of smears taken in 1978 and 1982 showed that recognition of koilocytosis by the laboratory had increased substantially over time while a tendency had developed to downgrade nuclear changes in the presence of koilocytosis. Correction of the 1978 and 1982 smear results to the 1984-85 classifications suggested that prevalence of koilocytosis had increased little (from 13.4% to 16.1%, P = 0.20) while there had been a substantial real increase in CIN (0.8% to 2.4%, P less than 0.001). To try to explain the trend in CIN, other characteristics of a sample of attenders at the STD clinic were studied. There were no appreciable trends in prevalence of past STD, number of sexual partners in the last 3 months, method of contraception, genital warts and culture of N. gonorrhoea, T. vaginalis, C. albicans and Chlamydia sp. from the vagina. There was an increase in the proportions in socioeconomic group I, as classified by postcode of residence (17.0% to 26.9%, P = 0.04), referred as contacts rather than with symptoms (24.0% to 41.6%, P less than 0.001), with a clinical diagnosis of genital herpes (5.0% to 8.6%, P = 0.08) and with herpes virus cultured from the cervix (2.1% to 6.3%, P = 0.03). The trend in prevalence of herpes virus infection was not explained by the other trends. It may explain the trend in prevalence of CIN.

Cervical cytology in Western Australia. Frequency, geographical and socioeconomic distributions and providers of the service

Basic data were obtained from the records of 16,069 women who had smears taken for cervical cytological examination in Western Australia during an eight-week period in 1983. The peak smear rate was 340.7 per 1000 at 25-29 years of age and fell thereafter with age. The estimated peak frequency of smears that were designated as "screening" smears was 178.3 per 1000 at 30-34 years of age. Screening smears comprised 39% to 66% of the total number of smears, depending on age. After correction for the estimated prevalence of past hysterectomy, only in the age range 20-34 years did the rate of all smears approach the rate of screening smears that would be obtained under a recommended frequency of once every three years. The frequency of screening smears was 20% less in rural areas of Western Australia than in the capital city, Perth. In Perth it fell with decreasing socioeconomic status. General practitioners took 62.4% of all smears and 70.3% of screening smears. On average, female general practitioners took twice as many smears than did male general practitioners.

Invasive carcinoma of the cervix in young women

The cases of 194 women aged 40 years of age or less who had been diagnosed as having invasive cervical cancer in Queensland during 1972-1981 were reviewed retrospectively. Medical records contained a previous cervical cytological report for 89 women, with 18 of these having had a negative result of a smear test within two years of the diagnosis of invasive cancer. Cytological review of five of the 18 cases revealed neoplastic cells in three cases, and possible sampling inadequacies in the other two. Gynaecological symptoms had been present in seven of the 18 patients at the time of the negative result of cytological examination, and these persisted until the diagnosis was eventually made. A high index of suspicion is required when symptoms persist in spite of negative results of cytological examination and we recommend a review of the smear, a repeat smear examination with adequate sampling and referral for colposcopic examination in these circumstances.

Treatment of cervical intraepithelial neoplasia with the carbon dioxide laser

Between 1978 and 1983, one hundred and forty-six patients with CIN I-III were treated with the carbon dioxide laser and 129 have been followed for 6 to 58 months. The remission rate was 92.2% after one treatment and 98.4% after two treatments. All persistent lesions were detected within 8 weeks after treatment. After confirmation of remission, 4 patients (3.1%) developed recurrence of CIN at an average of 37 months after treatment. The CO2 laser therapy is safe, effective, and cost saving for the patient, but a certain rate of recurrence is to be expected and the necessity of a long-term follow-up is stressed.

Trends in cervical cancer and carcinoma in situ in Great Britain

Doubts have frequently been expressed about the effectiveness of the screening programme for cervical cancer in Britain. These doubts have been reinforced as a result of recent increases in mortality from this disease among younger women. In this paper we discuss trends in registration and mortality data, relate these to the level of screening, and conclude that screening may in fact have had a considerable impact on mortality rates. There is good evidence that in some age groups there has been a large increase in the incidence of carcinoma in situ of the cervix; it seems likely that the potential increase in cervical cancer incidence and mortality may have been partially prevented as a result of the screening programme. The extent of this effect cannot be quantified precisely because of uncertainties concerning the natural history of cervical cancer, differences in risk for different cohorts, and the possible effects of other factors. It is likely that incidence rates will continue to change, and it will be necessary to monitor these and the screening programme with some care in order to make the best use of the resources available for cervical cytology.