Beyond the Poster

From Cervical Sample to Prevention Insight

Exploring the relationship between sexually transmitted infections and cervical intraepithelial neoplasia

Preventative Gynecology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
In collaboration with Nilou Laboratory

01 — What happened beyond the clinic?

This study followed women referred for colposcopy because of abnormal cervical cytology or a positive HPV test.

But the diagnostic pathway did not stop at colposcopy.

Each cervical specimen entered a molecular diagnostic workflow designed to detect multiple sexually transmitted pathogens:

Cervical sample
↓
DNA extraction & PCR
↓
Flow-through hybridization / PCR Flowchip
↓
Detection of 10 STI pathogens

The laboratory panel included:

• Ureaplasma parvum
• Haemophilus ducreyi
• Chlamydia trachomatis
• Herpes simplex virus type 1
• Herpes simplex virus type 2
• Mycoplasma hominis
• Mycoplasma genitalium
• Neisseria gonorrhoeae
• Treponema pallidum
• Trichomonas vaginalis

Among the detected pathogens, Ureaplasma parvumandMycoplasma genitalium were the most frequently identified in this cohort.

02 — What did we actually find?

The central question

Does STI positivity correlate with CIN?

Among the 36 women with complete pathology data, the distribution was:

The observed correlation was:

r = 0.192

p = 0.261

A weak positive correlation was observed, but it was not statistically significant.

The adjusted logistic regression analysis similarly did not demonstrate a significant association between STI positivity and CIN:

aOR = 1.35 | 95% CI: 0.51–3.55 | p = 0.55

What does this mean?

The findings do not establish that STI positivity is associated with CIN in this study population.

Importantly, a non-significant result does not necessarily mean that a relationship does not exist. The small sample size and cross-sectional design limit the ability to detect or explain potentially complex relationships between infections, HPV persistence and cervical lesions.

03 — A prevention gap worth noticing

One of the most striking findings was not the STI–CIN correlation.

It was the prevention profile of the study population.

80.5%

High-risk HPV positive
33 / 41 women

17.1%

HPV vaccination coverage
7 / 41 women

In other words, 82.9% of participants had no history of HPV vaccination, while high-risk HPV was detected in 80.5% of the study population.

This contrast highlights an important prevention gap in this clinical population.

An interesting observation

Approximately 75.6% of participants had university-level education, yet HPV vaccination coverage remained low.

This suggests that education alone may not be sufficient to ensure uptake of preventive interventions.

The study therefore points toward a broader question:

What prevents women from translating awareness into preventive action?

Cost, access, health-system factors, sociocultural attitudes and perceptions of HPV risk may all deserve investigation in future research. These factors should be tested directly rather than assumed from the present data.

04 — Another behavioral signal

The study population also showed a striking pattern in contraceptive practice:

78.0%

reported withdrawal as their contraceptive method.

Only a very small proportion reported condom use or other contraceptive methods.

This finding is not evidence that withdrawal caused STI positivity or CIN.

However, it raises an important research question:

Could future prevention studies benefit from addressing STI prevention and contraceptive counseling together, rather than treating them as completely separate issues?

This hypothesis requires dedicated prospective research.

05 — What can future studies learn from this study?

The most important lesson may be methodological.

From “Is STI associated with CIN?”

to

“Which infection, in which patient, at which stage, and through which pathway?”

Future studies could move beyond overall STI positivity and investigate:

1. Pathogen-specific effects

Instead of combining all STIs into a single positive/negative variable, future studies could examine whether individual pathogens—particularly U. parvumandM. genitalium in light of their frequency in this cohort—show different relationships with HPV persistence or CIN.

2. HPV persistence

A longitudinal design could determine whether specific co-infections are associated with:

HPV acquisition → HPV persistence → lesion development → CIN progression/regression

The present cross-sectional design cannot establish this temporal sequence.

3. Co-infection patterns

Future research could examine combinations such as:

HR-HPV + STI

versus

HR-HPV alone

to determine whether particular co-infection patterns are associated with different cervical outcomes.

4. Larger, adequately powered cohorts

The STI–CIN analysis included only 36 women with complete pathology data.

A larger sample would provide greater statistical power and allow more reliable adjustment for potential confounders.

5. Prevention-focused research

Future studies should investigate why HPV vaccination uptake remains low and whether interventions addressing:

• vaccine knowledge,
• perceived risk,
• cost and accessibility,
• healthcare-provider recommendation,
• sociocultural barriers,
• and screening behavior

can improve preventive uptake.

These questions are especially relevant because the present cohort demonstrated high HR-HPV positivity alongside low vaccination coverage.

06 — What this study does NOT tell us

Scientific findings are defined not only by what they show, but also by what they cannot show.

This study does not establish:

• that STIs cause CIN;
• that a specific STI promotes CIN progression;
• that HPV vaccination prevents CIN in this particular cohort;
• that withdrawal increases STI risk;
• or that the most frequently detected pathogens are necessarily the most clinically important.

These questions require larger and preferably longitudinal studies.

07 — The bigger picture

One study. Three signals.

HIGH HR-HPV PREVALENCE
80.5%

↓

LOW HPV VACCINATION COVERAGE
17.1%

↓

UNCERTAIN STI–CIN RELATIONSHIP
r = 0.192 | p = 0.261

Together, these findings suggest that cervical disease prevention should not focus on a single pathogen or a single intervention.

A more comprehensive research agenda could integrate:

HPV vaccination + cervical screening + STI assessment + behavioral and sociocultural research

Take-home message

The present study did not demonstrate a statistically significant association between STI positivity and CIN.

However, it identified several findings that deserve further investigation:

High-risk HPV was highly prevalent.
HPV vaccination coverage was low.
U. parvum and M. genitalium were the most frequently detected pathogens.
The STI–CIN relationship remains unresolved.

The next step is not simply a larger version of the same study.

It is a larger, longitudinal and pathogen-specific study designed to examine HPV persistence, co-infections, cervical lesion evolution and barriers to prevention.

Acknowledgment

We sincerely thank the dedicated team at Nilou Laboratory for their invaluable support, collaboration and expertise throughout this research project.

Their contribution supported the laboratory diagnostic component of this study and enriched the quality of the research.

Research Team

Preventative Gynecology Research Center
Shahid Beheshti University of Medical Sciences
Tehran, Iran

Laboratory Collaboration:
Nilou Laboratory, Tehran, Iran

Corresponding Author:
F. Farzaneh
F.farzaneh@sbmu.ac.ir