Fibroblast growth factor receptor is a mechanistic link between visceral adiposity and cancer

Epidemiological evidence implicates excess adipose tissue in increasing cancer risk. Despite a steeply rising global prevalence of obesity, how adiposity contributes to transformation (stage a non-tumorigenic cell undergoes to become malignant) is unknown. To determine the factors in adipose tissue that stimulate transformation, we used a novel ex vivo system of visceral adipose tissue (VAT)-condition medium-stimulated epithelial cell growth in soft agar. To extend this system in vivo, we used a murine lipectomy model of ultraviolet light B-induced, VAT-promoted skin tumor formation. We found that VAT from mice and obese human donors stimulated growth in soft agar of non-tumorigenic epithelial cells. The difference in VAT activity was associated with fibroblast growth factor-2 (FGF2) levels. Moreover, human and mouse VAT failed to stimulate growth in soft of agar in cells deficient in FGFR-1 (FGF2 receptor). We also demonstrated that circulating levels of FGF2 were associated with non-melanoma tumor formation in vivo. These data implicate FGF2 as a major factor VAT releases to transform epithelial cells—a novel, potential pathway of VAT-enhanced tumorigenesis. Strategies designed to deplete VAT stores of FGF2 or inhibit FGFR-1 in abdominally obese individuals may be important cancer prevention strategies as well as adjuvant therapies for improving outcomes.

Clear cell carcinoma of the ovary: characterization of its CD44 isoform repertoire

OBJECTIVE

CD44 is a cell surface receptor implicated in tumor metastases. We have previously shown that there is a loss of CD44 splice control in clear cell carcinoma (CCCa) of the ovary. Our aim is to characterize the expression of CD44-3v, -5v, -7v, and -10v in clear cell ovarian tumors and to determine their prognostic value.

METHODS

Twenty-two cases of ovarian CCCa were studied for CD44-3v, -5v, -7v, and -10v expression by immunocytochemistry.

RESULTS

The primary tumors showed expression of CD44-3v, -5v, -7v, and -10v in 44, 55, 61, and 39% of the cases, respectively. We were able to compare the expression of CD44 in the primary tumor and metastatic sites from the same patient in 7 cases (metastatic sites n = 16). We observed decreased immunoreactivity of CD44-3v, -5v, -7v, and -10v in 67, 100, 93, and 92% of the sites, respectively. CD44-3v and -10v expression was absent in 100% of the nonaffected contralateral ovaries while -7v and -10v were expressed in 1/11 (9%) of them. When CD44-10v was not expressed in the primary tumor, only 18% of the women recurred or died of disease; in contrast, of the cases where it was present, 71% of the women recurred or died of disease (P = 0.049).

CONCLUSIONS

There is aberrant alternative mRNA splicing in the development of CCCa of the ovary when compared to the contralateral nonaffected ovary. The expression of CD44-10v correlates with survival. Larger series are needed to further understand the role of CD44 isoforms in ovarian cancer metastases.

Papillary serous and clear cell type lead to poor prognosis of endometrial carcinoma in black women

OBJECTIVE

To investigate the significance of race and histologic type as prognostic factors in endometrial carcinoma.

METHODS

We conducted a retrospective review of the medical records of all patients diagnosed with endometrial cancer from 1982 to 1995. Patients' clinical and pathologic characteristics were analyzed.

RESULTS

The sample consisted of 401 patients, 59.9% (N = 229) were blacks and 40.1% (N = 153) were non-blacks. The mean age was 63.7 +/- 11.6 years. The histologic subtypes of endometrial carcinoma included 346 endometrioid (86.3%), 42 papillary serous (10.5%), and 13 clear cell (3.2%) adenocarcinomas. We found 79% of endometrioid adenocarcinomas were stage I or II compared to 26% of papillary serous tumors and 58% of clear cell carcinomas (P < 0.01). Eighty-eight percent of patients with papillary serous and 77% of patients with clear cell cancers were black (P < 0.01). Within each stage, patients were treated similarly irrespective of cell type or race. Five-year survival for endometrioid, papillary serous and clear cell adenocarcinomas was 69, 18, and 25%, respectively (P < 0.01). Black women had poorer 5-year survival (56%) than non-black women (71%). In multivariate analyses using age, stage, race, and histology, only stage and histology were independent risk factors for survival.

CONCLUSIONS

Patients with papillary serous and clear cell endometrial cancer were more likely to be black, present at an advanced stage of disease, and have poor survival compared to patients with endometrioid adenocarcinoma. This may help to explain the poorer survival reported in blacks with endometrial cancer.

CD4 lymphocytes in women with invasive and preinvasive cervical neoplasia

OBJECTIVE

To assess the relationship between CD4 lymphocyte population and stage of disease in cervical neoplasia.

METHODS

Study population was 107 women with invasive cervical cancer, 116 women with cervical intraepithelial neoplasia (CIN), and 32 women without neoplasia diagnosed in 1988-1994. All women under age 50 were seronegative for the human immunodeficiency virus (HIV). All women over age 50 with CD4:CD8 ratio below normal were HIV-negative. Stage was defined by FIGO criteria using clinical findings. CD4 and CD8 lymphocyte populations were enumerated by flow cytometry prior to treatment. The normal range of CD4 counts was defined as 537-1571 cells/mm3.

RESULTS

Distribution of CD4 count was similar in stages I (n = 40), II (n = 24), and III (n = 32), with 31% below normal and 9% above normal (mean CD4 count = 881). However, in stage IV (n = 11), 64% were below normal and 18% above normal (mean CD4 = 591). The difference in distribution between stages I-III and stage IV was statistically significant. Among 116 CIN patients, 10% had CD4 counts below normal and 3% above normal (mean CD4 = 910). Among 32 women without cervical neoplasia, 0% had CD4 counts below normal and 3% above normal. The difference between CIN and invasive cancer in the distribution of CD4 counts and CD8 counts was significant (P < 0.01). There was no difference in the CD4 count distribution by CIN severity. Forty-five percent of patients with below-normal CD4 counts at diagnosis developed recurrent cancer compared to 43% of patients with normal or above-normal CD4 counts.

CONCLUSION

Women with invasive cervical cancer have lower CD4 counts and a broader distribution compared to women with preinvasive or no neoplasia. Metastatic cancer at diagnosis was associated with severely depressed CD4 count.

Age, substance abuse, and survival of patients with cervical carcinoma

BACKGROUND

The poor survival of young patients with cervical cancer in a low income, disadvantaged community stimulated an investigation of pathologic and behavioral risk factors.

METHODS

The records of 1173 patients with cervical cancer diagnosed in 1967-1988 were evaluated with respect to age, stage, histology, and presenting symptoms. Histopathologic risk factors were evaluated in 196 patients with Stage IB disease treated by initial hysterectomy. Substance abuse behaviors were evaluated for 332 symptomatic patients with Stages IB-III disease diagnosed from 1976 to 1988.

RESULTS

There were no significant age-related differences in survival for patients without squamous cell carcinoma or those with Stage IA and asymptomatic Stage IB squamous cell carcinoma. Women age 70 years and older had a poorer survival rate than did younger women with Stages IB-III disease. Symptomatic patients with squamous cell carcinoma younger than age 50 years had a poorer survival than did patients age 50-69 years with Stages IB/IIA, IIB, and III disease. For patients with symptomatic Stage IB tumors, poor prognostic histopathologic factors were distributed equally among women younger than age 50 and those aged 50-69 years. Substance abuse was significantly more prevalent among younger patients, and patients who smoked or abused alcohol or drugs had significantly poorer survival than did nonsubstance abusers. However, in a multivariate analysis of age, stage, and substance abuse, young age remained a significantly poor prognostic factor.

CONCLUSIONS

Substance abuse may contribute to poor outcome of young patients with symptomatic squamous cell carcinoma but does not explain adequately their poor survival.