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Antimicrob Agents Chemother. 2007 June; 51(6): 2208–2210.
Published online 2007 April 9. doi:  10.1128/AAC.00871-06
PMCID: PMC1891372

Clinical Response and Tolerability to and Safety of Saquinavir with Low-Dose Ritonavir in Human Immunodeficiency Virus Type 1-Infected Mothers and Their Infants[down-pointing small open triangle]

Abstract

Saquinavir boosted with low-dose ritonavir given with zidovudine and lamivudine was well tolerated by pregnant women and their infants. All mothers had <400 human immunodeficiency virus type 1 RNA copies/ml at delivery. Two had elevated liver transaminases and amylase. Seven infant adverse events were possibly treatment related (anemia, neutropenia, and hyperbilirubinemia).

Pregnant women are offered combination antiretroviral therapy for maternal health and to reduce perinatal human immunodeficiency virus type 1 (HIV-1) transmission (8). Reduced concentrations of protease inhibitors (PIs) in plasma have been described for nelfinavir, indinavir, saquinavir (SQV) (2, 4, 5, 7), and lopinavir/ritonavir (RTV). Low-dose RTV is used to increase the plasma levels of PIs; however, desired plasma levels are not always achieved from boosted-PI regimens. With the standard dose of lopinavir/RTV, Pediatric AIDS Clinical Trial Group (PACTG) 1026 demonstrated that exposure was lower during late pregnancy than postpartum and that it was lower than that of nonpregnant controls from previous studies (9). Clinical efficacy did not change; however, prolonged inadequate levels might lead to viral escape and viral-resistance development. In contrast, we reported that a regimen of SQV boosted with a low dose of RTV achieved adequate plasma levels for each subject, with an overall drug exposure similar to that of nonpregnant adults (1, 2). The clinical safety and tolerability are presented in order for clinicians to consider this a good alternative regimen during pregnancy.

Results of the PK portion, study design, dosing, and sociodemographic characteristics have been reported previously (1, 2). Adverse events were graded according to the National Institute of Allergy and Infectious Diseases Division of AIDS (NIAID/DAIDS) toxicity tables (3). Signs and symptoms were graded as mild (grade 1), moderate (grade 2), severe (grade 3), or life-threatening (grade 4).

The protocol-targeted, maternal adverse events included any grade 3 or 4 event as well as grade 2 adverse events for glucose, aspartate transaminase (AST), alanine aminotransferase (ALT), uric acid, proteinuria, and neurocerebellar or neurosensory symptoms. All grade 3 and 4 adverse events were managed by discontinuation of all study drugs, with rechallenge for grade 3 subjects if toxicity resolved within 72 h. In addition, grade 2 adverse events were managed as if they were grade 3. Protocol-targeted, infant adverse events included all grade 3 and 4 events, with drug discontinuation except for anemia and neutropenia and with repeat testing performed within 72 h and discontinued if toxicity persisted. All adverse events were reviewed by the study team and classified as definitely related, possibly related, or not related to study medications. Three mothers entering the study with <400 copies/ml of viral RNA were already taking SQV and had evidenced a clinical response. Infants were born between March 2001 and October 2002. The proportion of women with undetectable plasma HIV-1 RNA (<400 copies/ml) increased from 23% (3/13) at baseline to 100% (13/13) at delivery (P = 0.002, McNemar's exact test) and 69% (9/13) and 77% (10/13), respectively, at 6 and 12 weeks postpartum. The median absolute CD4 count increased throughout the treatment period (not shown), and the median CD4 count increased by 287 cells/m3 (P = 0.001, Wilcoxon signed-rank test), representing a significant increase between study entry and delivery (P < 0.001) but not between delivery and 12 weeks postpartum.

Nine adverse events were reported for mothers; two were grade 3, with elevated amylase (possibly related) and hyperglycemia (nonrelated), and the remaining were grade 2 (Table (Table1).1). One mother had a grade 2 elevation in liver enzymes (AST and ALT), resulting in (protocol-mandated) permanent drug discontinuation at 35 weeks of gestation after 11 weeks of treatment.

TABLE 1.
Protocol targeted adverse events in mothers

One infant never began treatment; the mother stopped therapy prior to delivery. One discontinued therapy at 4 weeks of age because of grade 3 anemia. Eleven infants completed 6 weeks of study treatment. Nineteen adverse events were reported among 10 infants (Table (Table2).2). Five infants had seven adverse events that were possibly treatment related: three had grade 3 anemia, three had grade 3 neutropenia, and one had grade 4 hyperbilirubinemia.

TABLE 2.
Protocol targeted adverse events in infants

One infant was HIV infected, with a negative HIV-1 RNA PCR at 6 weeks of age but detectable HIV-1 RNA at 12 and 24 weeks and a positive HIV DNA PCR at 24 weeks. This child's mother discontinued all study drugs (for 1 week) at 27 weeks' gestation due to grade 2 hepatotoxicity and restarted 1 week later with normalization of liver enzymes. Hepatotoxicity returned, and the study drugs were permanently discontinued at 35 weeks' gestation after another week of discontinuation. The PI was switched to nelfinavir, while zidovudine (ZDV) and lamivudine (3TC) were maintained for the remainder of pregnancy. A scheduled Cesarean section was performed at 38 weeks, and the viral load was <400 copies/ml. The baby received ZDV for the first 6 weeks of life and did not breast-feed.

SQV in a soft-gel capsule formulation with low-dose RTV given in combination with ZDV and 3TC was well tolerated by women during pregnancy, during delivery, and postpartum, and minimal infant toxicity occurred. The ZDV and 3TC regimen was also well tolerated by the infants. The most common adverse events in the infants, anemia and neutropenia, likely resulted from ZDV therapy. No adverse events were judged as definitely related to the study treatment, and no life-threatening or serious adverse events for mothers or infants occurred during the study. The antiviral activity of this regimen was demonstrated by a reduction of the maternal HIV-1 RNA level from study entry to delivery and a consistent CD4 cell count increase during treatment. The increase in viral loads observed in three of the women between delivery and 12 weeks postpartum, although not statistically significant, suggests the possibility of reduced medication adherence during the postpartum period, yet all of the women reported adherence. An alternative explanation would be the development of drug-resistant virus. Since viral-sensitivity testing was not available, we cannot prove or disprove this possibility.

The SQV soft-gel capsule formulation is no longer available; however, the results from this study are important because the new hard-gel capsule (HGC) formulation has been shown to achieve the targeted plasma levels in pregnant women (6). A dose of 1,200 mg HGC SQV/100 mg RTV given daily to two HIV-infected pregnant women, with areas under the concentration-time curve above 10,000 ng·h/ml, has also been studied. The clinical safety of the new formulation has been reported as well (7). The clinical efficacy and safety parameters of SQV during pregnancy make it a good choice for HIV-infected pregnant women.

Acknowledgments

This work was supported by the PACTG of the National Institute of Allergy and Infectious Diseases and the National Institute of Child Health and Human Development.

We acknowledge the work of Shiara Ortiz-Pujols and Alison Robbins for their outstanding contributions as clinical trial specialists at the PACTG operations office. We acknowledge the women and infants who participated in the study and the collaborating PACTG units. The latter were as follows: at site 2802 (University of Medicine and Dentistry of the New Jersey Medical School, University Hospital, Newark, NJ), Lisa Pompeo, Paul Palumbo, and Philip Andrew; at site 4701 (Duke University), Elizabeth Livingston, Lori Ferguson, Lisa Martel, and Jean Hurwitz; at site 5031 (San Juan City Hospital), Rodrigo Díaz, Elvia Perez, Midnela Acevedo-Flores, and María E. Texidor; at site 5048 (Los Angeles County and the Medical Center, University of Southern California School of Medicine), Alice Stek, Ana Melendrez, James Homans, and Andrea Kovacs; at site 6601 (University of Puerto Rico PACTU), Irma L. Febo, Licette Lugo, Ruth Santos, and Ibet Heyer; and at site 4201 (University of Miami), Gwendolyn Scott.

This work is dedicated to the memory of Jane Pitt, who as an initial member of the coinvestigator team provided much input for the project.

Footnotes

[down-pointing small open triangle]Published ahead of print on 9 April 2007.

This is a PACTG 386 study.

REFERENCES

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Articles from Antimicrobial Agents and Chemotherapy are provided here courtesy of American Society for Microbiology (ASM)